FSCQ1265RTYDTU - ON SEMICONDUCTOR

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January 2014

FSQ-Series • Rev. 1.1.3

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ-Series:

FSCQ0565RT / FSCQ0765RT / FSCQ0965RT / FSCQ1265RT / FSCQ1565RT

Green Mode Fairchild Power Switch (FPS™)

Features

 Optimized for Quasi-Resonant Converter (QRC)

 Advanced Burst-Mode Operation for under 1 W

Standby Power Consumption

 Pulse-by-Pulse Current Limit

 Overload Protection (OLP) – Auto Restart

 Over-Voltage Protection (OVP) – Auto Restart

 Abnormal Over-Current Protection (AOCP) – Latch

 Internal Thermal Shutdown (TSD) – Latch

 Under-Voltage Lockout (UVLO) with Hysteresis

 Low Startup Current (Typical: 25 μA)

 Internal High Voltage SenseFET

 Built-in Soft-Start (20 ms)

 Extended Quasi-Resonant Switching

Applications

 CTV

 Audio Amplifier

Description

A Quasi-Resonant Converter (QRC) typically shows

lower EMI and higher power conversion efficiency

compared to a conventional hard-switched converter

with a fixed switching frequency. Therefore, a QRC is

well suited for noise-sensitive applications, such as

color TV and audio. Each product in the FSCQ series

contains an integrated Pulse Width Modulation (PWM)

controller and a SenseFET. This series is specifically

designed for quasi-resonant off-line Switch Mode Power

Supplies (SMPS) with minimal external components.

The PWM controller includes an integrated fixed

frequency oscillator, under-voltage lockout, leading-

edge blanking (LEB), optimized gate driver, internal soft-

start, temperature-compensated precise current sources

for loop compensation, and self-protection circuitry.

Compared with a discrete MOSFET and PWM controller

solution, the FSCQ series can reduce total cost,

component count, size, and weight; while increasing

efficiency, productivity, and system reliability. These

devices provide a basic platform for cost-effective

designs of quasi-resonant switching flyback converters.

Related Resources

 AN-4146 — Design Guidelines for Quasi-Resonant Converters Using FSCQ-Series Fairchild Power Switch

 AN-4140 — Transformer Design Consideration for Offline Flyback Converters Using Fairchild Power Switch

Ordering Information

Part Number

Package

Marking Code

BVDSS (V)

RDSON Max. (Ω)

FSCQ0565RTYDTU

TO-220F-5L (Forming)

CQ0565RT

650

2.2

FSCQ0765RTYDTU

TO-220F-5L (Forming)

CQ0765RT

650

1.6

FSCQ0965RTYDTU

TO-220F-5L (Forming)

CQ0965RT

650

1.2

FSCQ1265RTYDTU

TO-220F-5L (Forming)

CQ1265RT

650

0.9

FSCQ1565RTYDTU

TO-220F-5L (Forming)

CQ1565RT

650

0.7

FSQ-Series • Rev. 1.1.3 2

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Typical Circuit

VCC

GND

Drain

Sync

VO

PWM

VFB

AC

IN

FSCQ-Series

Figure 1. Typical Flyback Application

Table 1. Maximum Output Power(1)

230 VAC ±15%(2)

85–265 VAC

Product

Open Frame(3)

FSCQ0565RT

70 W

60 W

FSCQ0765RT

100 W

85 W

FSCQ0965RT

130 W

110 W

FSCQ1265RT

170 W

140 W

FSCQ1565RT

210 W

170 W

Notes:

1. The junction temperature can limit the maximum output power.

2. 230 VAC or 100/115 VAC with doubler.

3. Maximum practical continuous power in an open frame design at 50C ambient.

FSQ-Series • Rev. 1.1.3 3

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Internal Block Diagram

9V/15V

3 1

2

4

Auxiliary

Vref Main Bias

S

Q

R

OSC

Vcc

Vref

Idelay

IFB

VSD

TSD

Vovp

Sync

Vocp

S

Q

R

2.5R

Vcc good

(Vcc = 9V)

Vcc Drain

VFB

GND

AOCP

Gate

Driver

Vcc good

LEB

600ns

PWM

Soft Start

Internal

Bias

Normal

Operation

VBurst

Vref

IB

Vref

IBFB

Burst Mode

Controller

Normal Operation Burst Switching

5

Sync

Threshold

Quasi-Resonant

(QR) Switching

Controller

+

-

+

-

S

Q

R

Power Off Reset (Vcc = 6V)

4.6V/2.6V : Normal QR

3.0V/1.8V : Extended QR

fs

Figure 2. Functional Block Diagram

FSQ-Series • Rev. 1.1.3 4

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Pin Configuration

5

SYNC

4

VFB

3

VCC

2

GND

1

DRAIN

Figure 3. Pin Assignments (Top View)

Pin Descriptions

Name

Description

1

DRAIN

This pin is the high-voltage power SenseFET drain connection.

2

GND

This pin is the control ground and the SenseFET source.

3

VCC

This pin is the positive supply input. This pin provides internal operating current for both startup

and steady-state operation.

4

VFB

This pin is internally connected to the inverting input of the PWM comparator. The collector of an

opto-coupler is typically tied to this pin. For stable operation, a capacitor should be placed

between this pin and GND. If the voltage of this pin reaches 7.5 V, the overload protection

triggers, which results in the FPS™ shutting down.

5

SYNC

This pin is internally connected to the sync detect comparator for quasi-resonant switching. In

normal quasi-resonant operation, the threshold of the sync comparator is 4.6 V / 2.6 V. Whereas,

the sync threshold is changed to 3.0 V / 1.8 V in an extended quasi-resonant operation.

FSQ-Series • Rev. 1.1.3 5

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.

The absolute maximum ratings are stress ratings only. TA = 25°C, unless otherwise specified.

Symbol

Parameter

Value

Unit

VDS

Drain Pin Voltage

650

V

VCC

Supply Voltage

20

V

Vsync

Analog Input Voltage Range

-0.3 to 13

V

VFB

-0.3 to VCC

IDM

Drain Current Pulsed(4)

FSCQ0565RT

11.2

A

FSCQ0765RT

15.2

FSCQ0965RT

16.4

FSCQ1265RT

21.2

FSCQ1565RT

26.4

ID

Continuous Drain Current (TC = 25°C)

(TC: Case Back Surface Temperature)

FSCQ0565RT

2.8

A(rms)

FSCQ0765RT

3.8

FSCQ0965RT

4.1

FSCQ1265RT

5.3

FSCQ1565RT

6.6

ID*

Continuous Drain Current* (TDL = 25°C)

(TDL: Drain Lead Temperature)

FSCQ0565RT

5.0

A(rms)

FSCQ0765RT

7.0

FSCQ0965RT

7.6

FSCQ1265RT

11.0

FSCQ1565RT

13.3

ID

Continuous Drain Current (TC = 100°C)

FSCQ0565RT

1.7

A(rms)

FSCQ0765RT

2.4

FSCQ0965RT

2.6

FSCQ1265RT

3.4

FSCQ1565RT

4.4

EAS

Single-Pulsed Avalanche Energy(5)

FSCQ0565RT

400

mJ

FSCQ0765RT

570

FSCQ0965RT

630

FSCQ1265RT

950

FSCQ1565RT

1050

PD

Total Power Dissipation (TC = 25°C with Infinite Heat Sink)

FSCQ0565RT

38

W

FSCQ0765RT

45

FSCQ0965RT

49

FSCQ1265RT

50

FSCQ1565RT

75

TJ

Operating Junction Temperature

150

°C

TA

Operating Ambient Temperature

-25 to +85

°C

TSTG

Storage Temperature Range

-55 to +150

°C

Continued on the following page…

FSQ-Series • Rev. 1.1.3 6

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be

operable above the recommended operating conditions and stressing the parts to these levels is not recommended.

In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.

The absolute maximum ratings are stress ratings only. TA = 25°C, unless otherwise specified.

Symbol

Parameter

Value

Unit

ESD

Human Body Model (All Pins Except VFB)

(GND – VFB = 1.7 kV)

2.0

kV

Machine Model (All Pins Except VFB)

(GND – VFB = 170 V)

300

V

Notes:

4. Repetitive rating: pulse width limited by maximum junction temperature.

5. L = 15 mH, starting TJ = 25°C. These parameters, although guaranteed by design, are not tested in production.

Thermal Impedance

TA = 25°C unless otherwise specified.

Symbol

Parameter

Value

Unit

JC

Junction-to-Case Thermal Impedance

FSCQ0565RT

3.29

°C/W

FSCQ0765RT

2.60

FSCQ0965RT

2.55

FSCQ1265RT

2.50

FSCQ1565RT

2.00

FSQ-Series • Rev. 1.1.3 7

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

TA= 25°C unless otherwise specified.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

SenseFET Part

BVDSS

Drain-Source Breakdown Voltage

VGS = 0 V, ID = 250 μA

650

V

IDSS

Zero Gate Voltage Drain Current

VDS = 650 V,VGS = 0 V

250

μA

RDS(ON)

Drain-Source On-State Resistance

FSCQ0565RT

VGS = 10 V, ID = 1 A

1.76

2.20

Ω

FSCQ0765RT

VGS = 10 V, ID = 1 A

1.40

1.60

FSCQ0965RT

VGS = 10 V, ID = 1 A

1.00

1.20

FSCQ1265RT

VGS = 10 V, ID = 1 A

0.75

0.90

FSCQ1565RT

VGS = 10 V, ID = 1 A

0.53

0.70

CISS

Input Capacitance

FSCQ0565RT

VGS = 0 V, VDS = 25 V,

f = 1 MHz

1080

pF

FSCQ0765RT

1415

FSCQ0965RT

1750

FSCQ1265RT

2400

FSCQ1565RT

3050

COSS

Output Capacitance

FSCQ0565RT

VGS = 0 V, VDS = 25 V,

f = 1 MHz

90

pF

FSCQ0765RT

100

FSCQ0965RT

130

FSCQ1265RT

175

FSCQ1565RT

220

Control Section

fOSC

Switching Frequency

VFB = 5 V, VCC = 18 V

18

20

22

kHz

ΔfOSC

Switching Frequency Variation(7)

-25°C ≤ TA ≤ 85°C

0

±5

±10

%

IFB

Feedback Source Current

VFB = 0.8 V, VCC = 18 V

0.50

0.65

0.80

mA

DMAX

Maximum Duty Cycle

VFB = 5 V, VCC = 18 V

92

95

98

%

DMIN

Minimum Duty Cycle

VFB = 0 V, VCC = 18 V

0

%

VSTART

UVLO Threshold Voltage

VFB = 1 V

14

15

16

V

VSTOP

8

9

10

tSS

Soft-Start Time(6)

18

20

22

ms

Burst Mode Section

VBEN

Burst Mode Enable Feedback Voltage

0.25

0.40

0.55

V

IBFB

Burst Mode Feedback Source Current

VFB = 0 V

60

100

140

μA

tBS

Burst Mode Switching Time

VFB = 0.9 V,

Duty = 50%

1.2

1.4

1.6

ms

tBH

Burst Mode Hold Time

VFB = 0.9 V → 0 V

1.2

1.4

1.6

ms

Protection Section

VSD

Shutdown Feedback Voltage

VCC = 18 V

7.0

7.5

8.0

V

IDELAY

Shutdown Delay Current

VFB = 5 V, VCC = 18 V

4

5

6

μA

VOVP

Over-Voltage Protection

VFB = 3 V

11

12

13

V

VOCL

Over-Current Latch Voltage(6)

VCC = 18 V

0.9

1.0

1.1

V

TSD

Thermal Shutdown Temperature(7)

140

°C

Continued on the following page…

FSQ-Series • Rev. 1.1.3 8

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

TA= 25°C unless otherwise specified.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Sync Section

VSH1

Sync Threshold in Normal QR (H)

VCC = 18 V, VFB = 5 V

4.2

4.6

5.0

V

VSL1

Sync Threshold in Normal QR (L)

2.3

2.6

2.9

V

VSH2

Sync Threshold in Extended QR (H)

2.7

3.0

3.3

V

VSL2

Sync Threshold in Extended QR (L)

1.6

1.8

2.0

V

fSYH

Extended QR Enable Frequency

90

kHz

fSYL

Extended QR Disable Frequency

45

kHz

Total Device Section

IOP

Operating Supply Current in

Normal Operation(8)

FSCQ0565RT

VFB = 5 V

4

6

mA

FSCQ0765RT

4

6

FSCQ0965RT

6

8

FSCQ1265RT

6

8

FSCQ1565RT

7

9

IOB

Operating Supply Current in Burst Mode (Non-

Switching)(8)

VFB = GND

0.25

0.50

mA

ISTART

Startup Current

VCC = VSTART – 0.1 V

25

50

μA

ISN

Sustain Latch Current(6)

VCC = VSTOP – 0.1 V

50

100

μA

Current Sense Section

ILIM

Maximum Current Limit(9)

FSCQ0565RT

VCC = 18 V, VFB = 5 V

3.08

3.50

3.92

A

FSCQ0765RT

4.40

5.00

5.60

FSCQ0965RT

5.28

6.00

6.72

FSCQ1265RT

6.16

7.00

7.84

FSCQ1565RT

7.04

8.00

8.96

IBUR(pk)

Burst Peak Current

FSCQ0565RT

VCC = 18 V, VFB = Pulse

0.45

0.65

0.85

A

FSCQ0765RT

0.65

0.90

1.15

FSCQ0965RT

0.60

0.90

1.20

FSCQ1265RT

0.80

1.20

1.60

FSCQ1565RT

1.00

Notes:

6. These parameters, although guaranteed, are tested only in wafer test process.

7. These parameters, although guaranteed by design, are not tested in production.

8. This parameter is the current flowing in the control IC.

9. These parameters indicate inductor current.

10. These parameters, although guaranteed, are tested only in wafer test process.

FSQ-Series • Rev. 1.1.3 9

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Typical Performance Characteristics

Figure 4. Operating Supply Current

Figure 5. Burst Mode Supply Current

(Non-Switching)

Figure 6. Startup Current

Figure 7. Start Threshold Voltage

Figure 8. Stop Threshold Voltage

Figure 9. Initial Frequency

FSQ-Series • Rev. 1.1.3 10

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Typical Performance Characteristics

Figure 10. Maximum Duty Cycle

Figure 11. Over-Voltage Protection

Figure 12. Shutdown Delay Current

Figure 13. Shutdown Feedback Voltage

Figure 14. Feedback Source Current

Figure 15. Burst Mode Feedback Source Current

FSQ-Series • Rev. 1.1.3 11

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Typical Performance Characteristics

Figure 16. Feedback Offset Voltage

Figure 17. Burst Mode Enable Feedback Voltage

Figure 18. Sync. Threshold in Normal QR(H)

Figure 19. Sync. Threshold in Normal QR(L)

Figure 20. Sync. Threshold in Extended QR(H)

Figure 21. Sync. Threshold in Extended QR(L)

FSQ-Series • Rev. 1.1.3 12

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Typical Performance Characteristics

Figure 22. Extended QR Enable Frequency

Figure 23. Extended QR Disable Frequency

Figure 24. Pulse-by-Pulse Current Limit

FSQ-Series • Rev. 1.1.3 13

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Functional Description

1. Startup: Figure 25 shows the typical startup circuit

and the transformer auxiliary winding for the FSCQ

series. Before the FSCQ series begins switching, it

consumes only startup current (typically 25 μA). The

current supplied from the AC line charges the external

capacitor (Ca1) that is connected to the VCC pin. When

VCC reaches the start voltage of 15 V (VSTART), the

FSCQ series begins switching and its current

consumption increases to IOP. Then, the FSCQ series

continues normal switching operation and the power

required is supplied from the transformer auxiliary

winding, unless VCC drops below the stop voltage of 9 V

(VSTOP). To guarantee stable operation of the control IC,

VCC has under-voltage lockout (UVLO) with 6 V

hysteresis. Figure 26 shows the relationship between

the operating supply current of the FSCQ series and the

supply voltage (VCC).

FSCQ-Series

1N4007

Rstr

VCC

Ca1

Da

Isup

AC line

(Vacmin - Vacmax)

CDC

Ca2

Figure 25. Startup Circuit

ICC

VCC

VSTOP=9V

ISTART

IOP

VSTART=15V VZ

Power Up

Power Down

IOP Value

FSCQ0565RT: 4mA (Typ.)

FSCQ0765RT: 4mA (Typ.)

FSCQ0965RT: 6mA (Typ.)

FSCQ1265RT: 6mA (Typ.)

FSCQ1565RT: 7mA (Typ.)

Figure 26. Relationship between Operating Supply

Current and VCC Voltage

The minimum average of the current supplied from the

AC is given by:

STR

START

MIN

AC

AVG

SUP R

V

I1

2

2





















(1)

where Vacmin is the minimum input voltage, VSTART is

the FSCQ series’ start voltage (15 V), and Rstr is the

startup resistor. The startup resistor should be chosen

so that Isupavg is larger than the maximum startup

current (50 μA).

Once the resistor value is determined, the maximum

loss in the startup resistor is obtained as:

 























MAX

ACSTARTSTART

MAX

AC

STR

VVVV

R

Loss 22

2

12

2

(2)

where Vacmax is the maximum input voltage.

The startup resistor should have properly rated

dissipation wattage.

2. Synchronization: The FSCQ series employs a

quasi-resonant switching technique to minimize the

switching noise and loss. In this technique, a capacitor

(Cr) is added between the MOSFET drain and the

source, as shown in Figure 27. The basic waveforms of

the quasi-resonant converter are shown in Figure 28.

The external capacitor lowers the rising slope of the

drain voltage to reduce the EMI caused when the

MOSFET turns off. To minimize the MOSFET’s

switching loss, the MOSFET should be turned on when

the drain voltage reaches its minimum value, as shown

in Figure 28.

Vcc

Ca1

Da

CDC

Ca2

GND

Cr

Drain

Ids

Rcc

RSY1

RSY2

Sync

+

VDC

-Lm Vo

CSY

+

Vds

-

Vco

DSY

Np

Ns

Na

Figure 27. Synchronization Circuit

FSQ-Series • Rev. 1.1.3 14

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

VDC

VRO

Ipk

Ids

Vds

Vgs

MOSFET

Off MOSFET

On

Figure 28. Quasi-Resonant Operation Waveforms

The minimum drain voltage is indirectly detected by

monitoring the VCC winding voltage, as shown in Figure

27 and Figure 29. Choose voltage dividers, RSY1 and

RSY2, so that the peak voltage of the sync signal (Vsypk)

is lower than the OVP voltage (12 V) to avoid triggering

OVP in normal operation. It is typical to set Vsypk to be

lower than OVP voltage by 3–4 V. To detect the

optimum time to turn on MOSFET, the sync capacitor

(CSY) should be determined so that tR is the same with

tQ, as shown in Figure 29. The tR and tQ are given as:

















21

2

26.2 SYSY

SYCO

SYSYRRR RV

InCRt

(3)

eomQ CLt 

(4)

 

Fa

s

FOOa

CO V

NVVN

V





(5)

where:

Lm is the primary side inductance of the transformer;

Ns is the number of turns for the output winding;

Na is the number of turns for the VCC winding;

VFo is the diode forward-voltage drop of the output

winding;

VFa is the diode forward-voltage drop of the VCC

winding; and

Ceo is the sum of the output capacitance of the

MOSFET and the external capacitor, Cr.

Vsync

Vds

MOSFET Gate

2VRO

Vrh (4.6V)

Vrf (2.6V)

ON

tQ

tR

ON

Vsypk

Figure 29. Normal QR Operation Waveforms

Output Power

Switching

Frequency

Normal QR

Operation

Extended QR

Operation

90kHz

45kHz

Figure 30. Extended Quasi-Resonant Operation

In general, the QRC has a limitation in a wide load

range application, since the switching frequency

increases as the output load decreases, resulting in a

severe switching loss in the light load condition. To

overcome this limitation, the FSCQ series employs an

extended quasi-resonant switching operation. Figure 30

shows the mode change between normal and extended

quasi-resonant operations. In the normal quasi-resonant

operation, the FSCQ series enters into the extended

quasi-resonant operation when the switching frequency

exceeds 90 kHz as the load reduces. To reduce the

switching frequency, the MOSFET is turned on when

the drain voltage reaches the second minimum level, as

shown in Figure 31. Once the FSCQ series enters into

the extended quasi-resonant operation, the first sync

signal is ignored. After the first sync signal is applied,

the sync threshold levels are changed from 4.6 V and

2.6 V to 3 V and 1.8 V, respectively, and the MOSFET

turn-on time is synchronized to the second sync signal.

The FSCQ series returns to its normal quasi-resonant

operation when the switching frequency reaches 45 kHz

as the load increases.

FSQ-Series • Rev. 1.1.3 15

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Vsyn

c

Vds

MOSFET Gate

2VRO

4.6V

2.6V 3V

1.8V

ONON

Figure 31. Extended QR Operation Waveforms

3. Feedback Control: The FSCQ series employs

current mode control, as shown in Figure 32. An opto-

coupler (such as Fairchild’s H11A817A) and shunt

regulator (such as Fairchild’s KA431) are typically used

to implement the feedback network. Comparing the

feedback voltage with the voltage across the Rsense

resistor, plus an offset voltage, makes it possible to

control the switching duty cycle. When the reference pin

voltage of the shunt regulator exceeds the internal

reference voltage of 2.5 V, the opto-coupler LED current

increases, pulling down the feedback voltage and

reducing the duty cycle. This typically occurs when input

voltage is increased or output load is decreased.

3.1 Pulse-by-Pulse Current Limit: Because current

mode control is employed, the peak current through the

SenseFET is limited by the inverting input of the PWM

comparator (Vfb*) as shown in Figure 32. The feedback

current (IFB) and internal resistors are designed so that

the maximum cathode voltage of diode D2 is about

2.8 V, which occurs when all IFB flows through the

internal resistors. Since D1 is blocked when the

feedback voltage (Vfb) exceeds 2.8 V, the maximum

voltage of the cathode of D2 is clamped at this voltage,

thus clamping Vfb*. Therefore, the peak value of the

current through the SenseFET is limited.

3.2 Leading Edge Blanking (LEB): At the instant the

internal SenseFET is turned on, there is usually a high

current spike through the SenseFET, caused by the

external resonant capacitor across the MOSFET and

secondary-side rectifier reverse recovery. Excessive

voltage across the Rsense resistor can lead to incorrect

feedback operation in the current mode PWM control.

To counter this effect, the FSCQ series employs a

leading edge blanking (LEB) circuit. This circuit inhibits

the PWM comparator for a short time (tLEB) after the

Sense FET is turned on.

4OSC

VCC Vref

Idelay IFB

VSD

R

2.5R

Gate

Driver

OLP

D1 D2

+

Vfb*

-

Vfb

KA431

CB

VOH11A817A

Rsense

SenseFET

Figure 32. Pulse Width Modulation (PWM) Circuit

4. Protection Circuits: The FSCQ series has several

self-protective functions such as overload protection

(OLP), abnormal over-current protection (AOCP), over-

voltage protection (OVP), and thermal shutdown (TSD).

OLP and OVP are auto-restart mode protections, while

TSD and AOCP are latch mode protections. Because

these protection circuits are fully integrated into the IC

without external components, the reliability can be

improved without increasing cost.

- Auto-Restart Mode Protection: Once the fault

condition is detected, switching is terminated and

the SenseFET remains off. This causes VCC to fall.

When VCC falls to the under voltage lockout (UVLO)

stop voltage of 9 V, the protection is reset and the

FSCQ series consumes only startup current

(25 μA). Then, the VCC capacitor is charged up,

since the current supplied through the startup

resistor is larger than the current that the FPS

consumes. When VCC reaches the start voltage of

15 V, the FSCQ series resumes its normal

operation. If the fault condition is not removed, the

SenseFET remains off and VCC drops to stop

voltage again. In this manner, the auto-restart can

alternately enable and disable the switching of the

power SenseFET until the fault condition is

eliminated (see Figure 33).

- Latch Mode Protection: Once this protection is

triggered, switching is terminated and the

SenseFET remains off until the AC power line is

unplugged. Then, VCC continues charging and

discharging between 9 V and 15 V. The latch is

reset only when VCC is discharged to 6 V by

unplugging the AC power line.

FSQ-Series • Rev. 1.1.3 16

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Fault

situation

9V

15V

Vcc

Vds

ICC

IOP

t

Fault

occurs Fault

removed

Normal

operation Normal

operation

Power

on

ISTART

Figure 33. Auto Restart Mode Protection

4.1 Overload Protection (OLP): Overload is defined as

the load current exceeding its normal level due to an

unexpected abnormal event. In this situation, the

protection circuit should trigger to protect the SMPS.

However, even when the SMPS is in the normal

operation, the over load protection circuit can be

triggered during the load transition. To avoid this

undesired operation, the overload protection circuit is

designed to trigger after a specified time to determine

whether it is a transient situation or an overload

situation. Because of the pulse-by-pulse current limit

capability, the maximum peak current through the

SenseFET is limited, and therefore the maximum input

power is restricted with a given input voltage. If the

output consumes more than this maximum power, the

output voltage (Vo) decreases below the set voltage.

This reduces the current through the opto-coupler LED,

which also reduces the opto-coupler transistor current,

thus increasing the feedback voltage (Vfb). If Vfb

exceeds 2.8 V, D1 is blocked, and the 5 μA current

source starts to charge CB slowly up to VCC. In this

condition, Vfb continues increasing until it reaches 7.5 V,

then the switching operation is terminated as shown in

Figure 34. The delay for shutdown is the time required

to charge CB from 2.8 V to 7.5 V with 5 μA. In general, a

20~50 ms delay is typical for most applications. OLP is

implemented in auto restart mode.

VFB

t

2.8V

7.5V

Overload Protection

t12= CB*(7.5-2.8)/Idelay

t1t2

Figure 34. Overload Protection

4.2 Abnormal Over Current Protection (AOCP):

When the secondary rectifier diodes or the transformer

pins are shorted, a steep current with extremely high

di/dt can flow through the SenseFET during the LEB

time. Even though the FSCQ series has OLP (Overload

Protection), it is not enough to protect the FSCQ series

in that abnormal case, since severe current stress will

be imposed on the SenseFET until the OLP triggers.

The FSCQ series has an internal AOCP (Abnormal

Over-Current Protection) circuit as shown in Figure 35.

When the gate turn-on signal is applied to the power

SenseFET, the AOCP block is enabled and monitors the

current through the sensing resistor. The voltage across

the resistor is then compared with a preset AOCP level.

If the sensing resistor voltage is greater than the AOCP

level, the set signal is applied to the latch, resulting in

the shutdown of SMPS. This protection is implemented

in the latch mode.

2

S

Q

R

OSC

R

2.5R

GND

Gate

Driver

LEB

PWM

+

-

VAOCP

AOCP

Rsense

Figure 35. AOCP Block

4.3 Over-Voltage Protection (OVP): If the secondary

side feedback circuit malfunctions or a solder defect

causes an open in the feedback path, the current

through the opto-coupler transistor becomes almost

zero. Then, Vfb climbs up in a similar manner to the over

load situation, forcing the preset maximum current to be

supplied to the SMPS until the over load protection

triggers. Because more energy than required is provided

to the output, the output voltage may exceed the rated

voltage before the overload protection triggers, resulting

in the breakdown of the devices in the secondary side.

In order to prevent this situation, an over voltage

protection (OVP) circuit is employed. In general, the

peak voltage of the sync signal is proportional to the

output voltage and the FSCQ series uses a sync signal

instead of directly monitoring the output voltage. If the

sync signal exceeds 12 V, an OVP is triggered resulting

in a shutdown of SMPS. In order to avoid undesired

triggering of OVP during normal operation, the peak

voltage of the sync signal should be designed to be

below 12 V. This protection is implemented in the auto

restart mode.

4.4 Thermal Shutdown (TSD): The SenseFET and the

control IC are built in one package. This makes it easy

for the control IC to detect abnormal over temperature of

the SenseFET. When the temperature exceeds

approximately 150°C, the thermal shutdown triggers.

This protection is implemented in the latch mode.

FSQ-Series • Rev. 1.1.3 17

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

5. Soft Start: The FSCQ series has an internal soft-start

circuit that increases PWM comparator’s inverting input

voltage together with the SenseFET current slowly after

it starts up. The typical soft start time is 20 ms. The

pulse width to the power switching device is

progressively increased to establish the correct working

conditions for transformers, inductors, and capacitors.

Increasing the pulse width to the power switching device

also helps prevent transformer saturation and reduces

the stress on the secondary diode during startup. For a

fast build up of the output voltage, an offset is

introduced in the soft-start reference current.

6. Burst Operation: To minimize the power

consumption in the standby mode, the FSCQ series

employs burst operation. Once FSCQ series enters

burst mode, FSCQ series allows all output voltages and

effective switching frequency to be reduced. Figure 36

shows the typical feedback circuit for C-TV applications.

In normal operation, the picture on signal is applied and

the transistor Q1 is turned on, which decouples R3, DZ

and D1 from the feedback network. Therefore, only VO1

is regulated by the feedback circuit in normal operation

and determined by R1 and R2 as:















2

21

15.2 RRR

VNORM

O

(6)

In standby mode, the picture ON signal is disabled and

the transistor Q1 is turned off, which couples R3, DZ, and

D1 to the reference pin of KA431. Then, VO2 is

determined by the Zener diode breakdown voltage.

Assuming that the forward voltage drop of D1 is 0.7V,

VO2 in standby mode is approximately given by:

5.27.0

2 Z

STBY

OVV

(7)

Picture ON

Micom

Linear

Regulator

VO2

VO1 (B+)

KA431 R2

R1R3

Rbias

RD

RF

CFD1Q1

A

CR

Dz

Figure 36. Typical Feedback Circuit to Drop

Output Voltage in Standby Mode

Figure 38 shows the burst mode operation waveforms.

When the picture ON signal is disabled, Q1 is turned off

and R3 and Dz are connected to the reference pin of

KA431 through D1. Before Vo2 drops to Vo2stby, the

voltage on the reference pin of KA431 is higher than

2.5 V, which increases the current through the opto

LED. This pulls down the feedback voltage (VFB) of

FSCQ series and forces FSCQ series to stop switching.

If the switching is disabled longer than 1.4 ms, FSCQ

series enters into burst operation and the operating

current is reduced from IOP to 0.25 mA (IOB). Since there

is no switching, Vo2 decreases until it reaches Vo2stby. As

Vo2 reaches Vo2stby, the current through the opto LED

decreases allowing the feedback voltage to rise. When

the feedback voltage reaches 0.4 V, FSCQ series

resumes switching with a predetermined peak drain

current of 0.9 A. After burst switching for 1.4 ms, FSCQ

series stops switching and checks the feedback voltage.

If the feedback voltage is below 0.4 V, FSCQ series

stops switching until the feedback voltage increases to

0.4 V. If the feedback voltage is above 0.4 V, FSCQ

series goes back to the normal operation. The output

voltage drop circuit can be implemented alternatively, as

shown in Figure 37. In the circuit, the FSCQ series goes

into burst mode, when picture off signal is applied to Q1.

Then, Vo2 is determined by the Zener diode breakdown

voltage. Assuming that the forward voltage drop of opto

LED is 1 V, the approximate value of Vo2 in standby

mode is given by:

1

2 Z

STBY

OVV

(8)

Picture OFF

Micom

Linear

Regulator

VO2

VO1 (B+)

KA431 R2

R1

Rbias

RD

RF

CF

A

CR

Dz

Q1

Figure 37. Feedback Circuit to Drop Output

Voltage in Standby Mode

FSQ-Series • Rev. 1.1.3 18

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Vo2norm

VFB

Iop

Vds

0.4V

Vo2stby

IOP

Picture

On Picture Off

IOB

Picture

On

Burst Mode

(a) (c)(b)

0.4V

0.9A

1.4ms

(b) Burst Operation (c) Mode Change to Normal Operation

VFB

Vds

Ids

0.3V

0.4V

1.4ms

(a) Mode Change to Burst Operation

0.4V

0.9A

1.4ms

Figure 38. Burst Operation Waveforms

FSQ-Series • Rev. 1.1.3 19

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0565RT Typical Application Circuit

Application

Output Power

Input Voltage

Output Voltage (Max. Current)

C-TV

59 W

Universal Input

(90–270 Vac)

12 V (0.5 A)

18 V (0.3 A)

125 V (0.3 A)

24 V (0.4 A)

Features

 High Efficiency (>83% at 90 Vac Input)

 Wider Load Range through the Extended Quasi-Resonant Operation

 Low Standby Mode Power Consumption (<1 W)

 Low Component Count

 Enhanced System Reliability Through Various Protection Functions

 Internal Soft-Start (20 ms)

Key Design Notes

 24 V Output Designed to Drop to 8 V in Standby Mode

C103

10uF

50V

1

3

4

10

T1

EER3540

12V, 0.5A

C204

1000uF

35V

D205

EGP20D

11

LF101

C101

330nF

275VAC FUSE

250V

2.0A

C102

220uF

400V

RT101

5D-9

BD101

D101

1N4937

R103

5.1Ω

0.25W

6

7

R104

1.5kΩ

0.25W

2 4

5

1

3

GND

Drain SYNC

FB

Vcc

D103

1N4148

IC101

FSCQ0565RT

C106

47nF

50V

R105

470Ω

0.25W

C105

3.9nF

50V

ZD101

18V

1W

C107

680pF

1kV

BEAD101

D102

1N4937

C210

470pF

1kV

18V, 0.3A

D204

EGP20D

C205

1000uF

35V

13

C209

470pF

1kV

12

125V, 0.3A

D202

EGP20J

C201

100uF

160V

14

C207

470pF

1kV

L201

BEAD

16

C202

47uF

160V

24V, 0.4A

D203

EGP20D

C203

1000uF

35V

17

C208

470pF

1kV

18

OPTO101

FOD817A

R201

1kΩ

0.25W

C206

22nF

50V

C301

2.2nF

Q201

KA431

R203

39kΩ

0.25W

R202

1kΩ

0.25W

R205

220kΩ

0.25W

R204

4.7kΩ

0.25W

VR201

30kΩ

D201 Q202

KSC945 R206

5.1kΩ

0.25W

R207

5.1kΩ

0.25W

SW201

15

R102

150kΩ

0.25W

R101

100kΩ

0.25W

R106

1.5kΩ

1W

C104

10uF

50V

ZD202

5.1V

0.5W

R208

1kΩ

0.25W

Normal

Standby

D104

UF4007

ZD201

Figure 39. FSCQ0565RT Typical Application Circuit Schematic

FSQ-Series • Rev. 1.1.3 20

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0565RT Typical Application Circuit (Continued)

EER3540

N24V

Na7

13

14

15

16

17

18

N125V/2

N12V

N18V

Np1

Np2

1

2

3

4

5

6

8

9 10

11

12

N125V/2

Np2

N12V

N125V/2

N24V

Np1

N18V

Na

Figure 40. Transformer Schematic Diagram

Winding Specification

No

Pin (s→f)

Wire

Turns

Winding Method

Np1

1–3

0.5φ × 1

32

Center Winding

N125V/2

16–15

0.5φ × 1

32

Center Winding

N24V

18–17

0.4φ × 2

13

Center Winding

N12V

12–13

0.5φ × 2

7

Center Winding

Np2

3–4

0.5φ × 1

32

Center Winding

N125V/2

15–14

0.5φ × 1

32

Center Winding

N18V

11–10

0.4φ × 2

10

Center Winding

Na

7–6

0.3φ × 1

20

Center Winding

Electrical Characteristics

Specification

Remarks

Inductance

1–3

740 μH ±5%

1 kHz, 1 V

Leakage Inductance

1–3

10 μH Max.

2nd all short

Core & Bobbin

 Core: EER3540

 Bobbin: EER3540

 Ae: 107 mm2

FSQ-Series • Rev. 1.1.3 21

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Bill of Materials

Part

Value

Note

Fuse

FUSE

250 V / 2 A

NTC

RT101

5D-9

Resistor

R101

100 kΩ

0.25 W

R102

150 kΩ

0.25 W

R103

5.1 Ω

0.25 W

R104

1.5 kΩ

0.25 W

R105

470 Ω

0.25 W

R106

1.5 kΩ

1 W

R107

Open

R201

1 kΩ

0.25 W

R202

1 kΩ

0.25 W

R203

39 kΩ

0.25 W

R204

4.7 kΩ

0.25 W, 1%

R205

220 kΩ

0.25 W, 1%

R206

5.1 kΩ

0.25 W

R207

5.1 kΩ

0.25 W

R208

1 kΩ

0.25 W

VR201

30 kΩ

Capacitor

C101

330 nF / 275 VAC

C102

220 μF / 400 V

Box Capacitor

C103

10 μF / 50 V

Electrolytic

C104

10 μF / 50 V

Electrolytic

C105

3.9 nF / 50 V

Electrolytic

C106

47 nF / 50 V

Film Capacitor

C107

680 pF / 1 kV

Film Capacitor

C108

Open

C201

100 μF / 160 V

Electrolytic

C202

47 μF / 160 V

Electrolytic

C203

1000 μF / 35 V

Electrolytic

C204

1000 μF / 35 V

Electrolytic

C205

1000 μF / 35 V

Electrolytic

C206

22 nF / 50 V

Film Capacitor

C207

470 pF / 1 kV

Ceramic Capacitor

C208

470 pF / 1 kV

Ceramic Capacitor

C209

470 pF / 1 kV

Ceramic Capacitor

C210

470 pF / 1 kV

Ceramic Capacitor

C301

2.2 nF / 1 kV

AC Ceramic Capacitor

Part

Value

Note

Inductor

BEAD101

BEAD

BEAD201

5 μH

3 A

Diode

D101

1N4937

1 A, 600 V

D102

1N4937

1 A, 600 V

D103

1N4148

0.15 A, 50 V

D104

Short

D105

Open

ZD101

1N4746

18 V, 1 W

ZD102

Open

ZD201

1N5231

5.1 V, 0.5 W

D201

1N4148

0.15 A, 50 V

D202

EGP20J

2 A, 600 V

D203

EGP20D

2 A, 200 V

D204

EGP20D

2 A, 200 V

D205

EGP20D

2 A, 200 V

Bridge Diode

BD101

GSIB660

6 A, 600 V

Line Filter

LF101

14 mH

Transformer

T101

EER3540

Switch

SW201

ON/OFF

For MCU Signal

IC

IC101

FSCQ0565RT

TO-220F-5L

OPT101

FOD817A

Q201

KA431LZ

TO-92

Q202

KSC945

FSQ-Series • Rev. 1.1.3 22

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0765RT Typical Application Circuit

Application

Output Power

Input Voltage

Output Voltage (Max. Current)

C-TV

83 W

Universal Input

(90–270 Vac)

12 V (1 A)

18 V (0.5 A)

125 V (0.4 A)

24 V (0.5 A)

Features

 High Efficiency (>83% at 90 Vac Input)

 Wider Load Range through the Extended Quasi-Resonant Operation

 Low Standby Mode Power Consumption (<1 W)

 Low Component Count

 Enhanced System Reliability Through Various Protection Functions

 Internal Soft-Start (20 ms)

Key Design Notes

 24 V Output Designed to Drop to 8 V in Standby Mode

C103

10uF

50V

1

3

4

10

T1

EER3540

12V, 1.0A

C204

1000uF

35V

D205

EGP20D

11

LF101

C101

330nF

275VAC FUSE

250V

2.0A

C102

220uF

400V

RT101

5D-9

BD101

D101

1N4937

R103

5.1Ω

0.25W

6

7

R104

1.5kΩ

0.25W

2 4

5

1

3

GND

Drain SYNC

FB

Vcc

D103

1N4148

IC101

FSCQ0765RT

C106

47nF

50V

R105

470Ω

0.25W

C105

3.9nF

50V

ZD101

18V

1W

C107

1nF

1kV

BEAD101

D102

1N4937

C210

470pF

1kV

18V, 0.5A

D204

EGP20D

C205

1000uF

35V

13

C209

470pF

1kV

12

125V, 0.4A

D202

EGP20J

C201

100uF

160V

14

C207

470pF

1kV

L201

BEAD

16

C202

47uF

160V

24V, 0.5A

D203

EGP20D

C203

1000uF

35V

17

C208

470pF

1kV

18

OPTO101

FOD817A

R201

1kΩ

0.25W

C206

22nF

50V

C301

2.2nF

Q201

KA431

R203

39kΩ

0.25W

R202

1kΩ

0.25W

R205

220kΩ

0.25W

R204

4.7kΩ

0.25W

VR201

30kΩ

D201 Q202

KSC945 R206

5.1kΩ

0.25W

R207

5.1kΩ

0.25W

SW201

15

R102

150kΩ

0.25W

R101

100kΩ

0.25W

R106

1.5kΩ

1W

C104

10uF

50V

ZD202

5.1V

0.5W

R208

1kΩ

0.25W

Normal

Standby

D104

UF4007

ZD201

Figure 41. FSCQ0765RT Typical Application Circuit Schematic

FSQ-Series • Rev. 1.1.3 23

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0765RT Typical Application Circuit (Continued)

EER3540

N24V

Na7

13

14

15

16

17

18

N125V/2

N12V

N18V

Np1

Np2

1

2

3

4

5

6

8

9 10

11

12

N125V/2

Np2

N12V

N125V/2

N24V

Np1

N18V

Na

Figure 42. Transformer Schematic Diagram

Winding Specification

No

Pin (s→f)

Wire

Turns

Winding Method

Np1

1–3

0.5φ × 1

32

Center Winding

N125V/2

16–15

0.5φ × 1

32

Center Winding

N24V

18–17

0.4φ × 2

13

Center Winding

N12V

12–13

0.5φ × 2

7

Center Winding

Np2

3–4

0.5φ × 1

32

Center Winding

N125V/2

15–14

0.5φ × 1

32

Center Winding

N18V

11–10

0.4φ × 2

10

Center Winding

Na

7–6

0.3φ × 1

20

Center Winding

Electrical Characteristics

Specification

Remarks

Inductance

1–3

515 μH ±5%

1 kHz, 1 V

Leakage Inductance

1–3

10 μH Max.

2nd all short

Core & Bobbin

 Core: EER3540

 Bobbin: EER3540

 Ae: 107 mm2

FSQ-Series • Rev. 1.1.3 24

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Bill of Materials

Part

Value

Note

Fuse

FUSE

250 V / 2 A

NTC

RT101

5D-9

Resistor

R101

100 kΩ

0.25 W

R102

150 kΩ

0.25 W

R103

5.1 Ω

0.25 W

R104

1.5 kΩ

0.25 W

R105

470 Ω

0.25 W

R106

1.5 kΩ

1 W

R107

Open

R201

1 kΩ

0.25 W

R202

1 kΩ

0.25 W

R203

39 kΩ

0.25 W

R204

4.7 kΩ

0.25 W, 1%

R205

220 kΩ

0.25 W, 1%

R206

5.1 kΩ

0.25 W

R207

5.1 kΩ

0.25 W

R208

1 kΩ

0.25 W

VR201

30 kΩ

Capacitor

C101

330 nF / 275 VAC

C102

220 μF / 400 V

Box Capacitor

C103

10 μF / 50 V

Electrolytic

C104

10 μF / 50 V

Electrolytic

C105

3.9 nF / 50 V

Electrolytic

C106

47 nF / 50 V

Film Capacitor

C107

680 pF / 1 kV

Film Capacitor

C108

Open

C201

100 μF / 160 V

Electrolytic

C202

47 μF / 160 V

Electrolytic

C203

1000 μF / 35 V

Electrolytic

C204

1000 μF / 35 V

Electrolytic

C205

1000 μF / 35 V

Electrolytic

C206

22 nF / 50 V

Film Capacitor

C207

470 pF / 1 kV

Ceramic Capacitor

C208

470 pF / 1 kV

Ceramic Capacitor

C209

470 pF / 1 kV

Ceramic Capacitor

C210

470 pF / 1 kV

Ceramic Capacitor

C301

2.2 nF / 1 kV

AC Ceramic Capacitor

Part

Value

Note

Inductor

BEAD101

BEAD

BEAD201

5 μH

3 A

Diode

D101

1N4937

1 A, 600 V

D102

1N4937

1 A, 600 V

D103

1N4148

0.15 A, 50 V

D104

Short

D105

Open

ZD101

1N4746

18 V, 1 W

ZD102

Open

ZD201

1N5231

5.1 V, 0.5 W

D201

1N4148

0.15 A, 50 V

D202

EGP20J

2 A, 600 V

D203

EGP20D

2 A, 200 V

D204

EGP20D

2 A, 200 V

D205

EGP20D

2 A, 200 V

Bridge Diode

BD101

GSIB660

6 A, 600 V

Line Filter

LF101

14 mH

Transformer

T101

EER3540

Switch

SW201

ON/OFF

For MCU Signal

IC

IC101

FSCQ0765RT

TO-220F-5L

OPT101

FOD817A

Q201

KA431LZ

TO-92

Q202

KSC945

FSQ-Series • Rev. 1.1.3 25

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0965RT Typical Application Circuit

Application

Output Power

Input Voltage

Output Voltage (Max. Current)

C-TV

102 W

Universal Input

(90–270 Vac)

12 V (0.5 A)

18 V (0.5 A)

125 V (0.5 A)

24 V (1.0 A)

Features

 High Efficiency (>83% at 90 Vac Input)

 Wider Load Range through the Extended Quasi-Resonant Operation

 Low Standby Mode Power Consumption (<1 W)

 Low Component Count

 Enhanced System Reliability Through Various Protection Functions

 Internal Soft-Start (20 ms)

Key Design Notes

 24 V Output Designed to Drop to 8 V in Standby Mode

C103

10uF

50V

1

3

4

10

T1

EER3540

12V, 0.5A

C204

1000uF

35V

D205

EGP20D

11

LF101

C101

330nF

275VAC FUSE

250V

3.0A

C102

220uF

400V

RT101

5D-9

BD101

D101

1N4937

R103

5.1Ω

0.25W

6

7

R104

1.5kΩ

0.25W

2 4

5

1

3

GND

Drain SYNC

FB

Vcc

D103

1N4148

IC101

FSCQ0965RT

C106

47nF

50V

R105

470Ω

0.25W

C105

3.9nF

50V

ZD101

18V

1W

C107

1nF

1kV

BEAD101

D102

1N4937

C210

470pF

1kV

18V, 0.5A

D204

EGP20D

C205

1000uF

35V

13

C209

470pF

1kV

12

125V, 0.5A

D202

EGP30J

C201

100uF

160V

14

C207

470pF

1kV

L201

BEAD

16

C202

47uF

160V

24V, 1.0A

D203

EGP30D

C203

1000uF

35V

17

C208

470pF

1kV

18

OPTO101

FOD817A

R201

1kΩ

0.25W

C206

22nF

50V

C301

2.2nF

Q201

KA431

R203

39kΩ

0.25W

R202

1kΩ

0.25W

R205

220kΩ

0.25W

R204

4.7kΩ

0.25W

VR201

30kΩ

D201 Q202

KSC945 R206

5.1kΩ

0.25W

R207

5.1kΩ

0.25W

SW201

15

R102

150kΩ

0.25W

R101

100kΩ

0.25W

R106

1.5kΩ

1W

C104

10uF

50V

ZD202

5.1V

0.5W

R208

1kΩ

0.25W

Normal

Standby

D104

UF4007

ZD201

Figure 43. FSCQ0965RT Typical Application Circuit Schematic

FSQ-Series • Rev. 1.1.3 26

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ0965RT Typical Application Circuit (Continued)

EER3540

N24V

Na7

13

14

15

16

17

18

N125V/2

N12V

N18V

Np1

Np2

1

2

3

4

5

6

8

9 10

11

12

N125V/2

Np2

N12V

N125V/2

N24V

Np1

N18V

Na

Figure 44. Transformer Schematic Diagram

Winding Specification

No

Pin (s→f)

Wire

Turns

Winding Method

Np1

1–3

0.5φ × 1

32

Center Winding

N125V/2

16–15

0.5φ × 1

32

Center Winding

N24V

18–17

0.4φ × 2

13

Center Winding

N12V

12–13

0.5φ × 2

7

Center Winding

Np2

3–4

0.5φ × 1

32

Center Winding

N125V/2

15–14

0.5φ × 1

32

Center Winding

N18V

11–10

0.4φ × 2

10

Center Winding

Na

7–6

0.3φ × 1

20

Center Winding

Electrical Characteristics

Specification

Remarks

Inductance

1–3

410 μH ±5%

1 kHz, 1 V

Leakage Inductance

1–3

10 μH Max.

2nd all short

Core & Bobbin

 Core: EER3540

 Bobbin: EER3540

 Ae: 107 mm2

FSQ-Series • Rev. 1.1.3 27

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Bill of Materials

Part

Value

Note

Fuse

FUSE

250 V / 3 A

NTC

RT101

5D-9

Resistor

R101

100 kΩ

0.25 W

R102

150 kΩ

0.25 W

R103

5.1 Ω

0.25 W

R104

1.5 kΩ

0.25 W

R105

470 Ω

0.25 W

R106

1.5 kΩ

1 W

R107

Open

R201

1 kΩ

0.25 W

R202

1 kΩ

0.25 W

R203

39 kΩ

0.25 W

R204

4.7 kΩ

0.25 W, 1%

R205

220 kΩ

0.25 W, 1%

R206

5.1 kΩ

0.25 W

R207

5.1 kΩ

0.25 W

R208

1 kΩ

0.25 W

VR201

30 kΩ

Capacitor

C101

330 nF / 275 VAC

C102

220 μF / 400 V

Box Capacitor

C103

10 μF / 50 V

Electrolytic

C104

10 μF / 50 V

Electrolytic

C105

3.9 nF / 50 V

Electrolytic

C106

47 nF / 50 V

Film Capacitor

C107

1 nF / 1 kV

Film Capacitor

C108

Open

C201

100 μF / 160 V

Electrolytic

C202

47 μF / 160 V

Electrolytic

C203

1000 μF / 35 V

Electrolytic

C204

1000 μF / 35 V

Electrolytic

C205

1000 μF / 35 V

Electrolytic

C206

22 nF / 50 V

Film Capacitor

C207

470 pF / 1 kV

Ceramic Capacitor

C208

470 pF / 1 kV

Ceramic Capacitor

C209

470 pF / 1 kV

Ceramic Capacitor

C210

470 pF / 1 kV

Ceramic Capacitor

C301

2.2 nF / 1 kV

AC Ceramic Capacitor

Part

Value

Note

Inductor

BEAD101

BEAD

BEAD201

5 μH

3 A

Diode

D101

1N4937

1 A, 600 V

D102

1N4937

1 A, 600 V

D103

1N4148

0.15 A, 50 V

D104

Short

D105

Open

ZD101

1N4746

18 V, 1 W

ZD102

Open

ZD201

1N5231

5.1 V, 0.5 W

D201

1N4148

0.15 A, 50 V

D202

EGP30J

3 A, 600 V

D203

EGP30D

3 A, 200 V

D204

EGP20D

2 A, 200 V

D205

EGP20D

2 A, 200 V

Bridge Diode

BD101

GSIB660

6 A, 600 V

Line Filter

LF101

14 mH

Transformer

T101

EER3540

Switch

SW201

ON/OFF

For MCU Signal

IC

IC101

FSCQ0965RT

TO-220F-5L

OPT101

FOD817A

Q201

KA431LZ

TO-92

Q202

KSC945

FSQ-Series • Rev. 1.1.3 28

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ1265RT Typical Application Circuit

Application

Output Power

Input Voltage

Output Voltage (Max. Current)

C-TV

132 W

Universal Input

(90–270 Vac)

8.5 V (0.5 A)

15 V (0.5 A)

140 V (0.6 A)

24 V (1.5 A)

Features

 High Efficiency (>83% at 90 Vac Input)

 Wider Load Range through the Extended Quasi-Resonant Operation

 Low Standby Mode Power Consumption (<1 W)

 Low Component Count

 Enhanced System Reliability Through Various Protection Functions

 Internal Soft-Start (20 ms)

Key Design Notes

 24 V Output Designed to Drop to 8 V in Standby Mode

C103

10µF

50V

1

3

4

10

T1

EER4042

15V, 0.5A

C204

1000uF

35V

D205

EGP20D

11

LF101

C101

330nF

275VAC FUSE

250V

5.0A

C102

330uF

400V

RT101

5D-11

BD101

D103

1N4937

R103

5.1Ω

0.25W

6

7

R104

1.5kΩ

0.25W

2 4

5

1

3

GND

Drain SYNC

FB

Vcc

D106

1N4148

IC101

FSCQ1265RT

C106

47nF

50V

R105

470Ω

0.25W

C105

3.3nF

50V

ZD102

18V

1W

C107

1nF

1kV

BEAD101

D105

1N4937

C210

470pF

1kV

8.5V, 0.5A

D204

EGP20D

C205

1000uF

35V

13

C209

470pF

1kV

12

140V, 0.6A

D202

EGP30J

C201

150uF

160V

14

C207

470pF

1kV

L202

BEAD

16

C202

68uF

160V

24V, 1.5A

D203

EGP30D

C203

1000uF

35V

17

C208

470pF

1kV

18

OPTO101

FOD817A

R201

1kΩ

0.25W

C206

150nF

50V

C301

3.3nF Q201

KA431

LZ

R203

39kΩ

0.25W

R202

1kΩ

0.25W R205

240kΩ

0.25W

R204

4.7kΩ

0.25W

VR201

30kΩ

D201

1N4148

Q202

KSC945 R206

10kΩ

0.25W

R207

5.1kΩ

0.25W

SW201

15

R102

150kΩ

0.25W

R101

100kΩ

0.25W R106

1kΩ

1W

C104

10uF

50V

ZD201

5.1V

0.5W

R208

1kΩ

0.25W

Figure 45. FSCQ1265RT Typical Application Circuit Schematic

FSQ-Series • Rev. 1.1.3 29

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ1265RT Typical Application Circuit (Continued)

EER4042

N24V

Na7

13

14

15

16

17

18

N140V/2

N8.5V

N15V

Np1

Np2

1

2

3

4

5

6

8

9 10

11

12

N140V/2

N8.5V

N140V/2

NP2

NP1

N140V/2

N24V

N15V

Na

Figure 46. Transformer Schematic Diagram

Winding Specification

No

Pin (s→f)

Wire

Turns

Winding Method

N24

18–17

0.65φ × 2

8

Space Winding

NP1

1–3

0.1φ × 10 × 2

20

Center Winding

N140V/2

16–15

0.1φ × 10 × 2

23

Center Winding

Np2

3–4

0.1φ × 10 × 2

20

Center Winding

N140V/2

15–14

0.1φ × 10 × 2

22

Center Winding

N8.5V

12–13

0.6φ × 1

3

Space Winding

N15V

11–10

0.6φ × 1

6

Space Winding

Na

7–6

0.3φ × 1

13

Space Winding

Electrical Characteristics

Specification

Remarks

Inductance

1–4

315 μH ±5%

1 kHz, 1 V

Leakage Inductance

1–4

10 μH Max.

2nd all short

Core & Bobbin

 Core: EER4042

 Bobbin: EER4042 (18 Pin)

 Ae: 153 mm2

FSQ-Series • Rev. 1.1.3 30

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Bill of Materials

Part

Value

Note

Fuse

FUSE

250 V / 5 A

NTC

RT101

5D-11

Resistor

R101

100 kΩ

0.25 W

R102

150 kΩ

0.25 W

R103

5.1 Ω

0.25 W

R104

1.5 kΩ

0.25 W

R105

470 Ω

0.25 W

R106

1 kΩ

1 W

R107

Open

R201

1 kΩ

0.25 W

R202

1 kΩ

0.25 W

R203

39 kΩ

0.25 W

R204

4.7 kΩ

0.25 W, 1%

R205

240 kΩ

0.25 W, 1%

R206

10 kΩ

0.25 W

R207

5.1 kΩ

0.25 W

R208

1 kΩ

0.25 W

VR201

30 kΩ

Capacitor

C101

330 nF / 275 VAC

C102

330 μF / 400 V

Box Capacitor

C103

10 μF / 50 V

Electrolytic

C104

10 μF / 50 V

Electrolytic

C105

3.3 nF / 50 V

Electrolytic

C106

47 nF / 50 V

Film Capacitor

C107

1 nF / 1 kV

Film Capacitor

C108

Open

C201

100 μF / 160 V

Electrolytic

C202

68 μF / 160 V

Electrolytic

C203

1000 μF / 35 V

Electrolytic

C204

1000 μF / 35 V

Electrolytic

C205

1000 μF / 35 V

Electrolytic

C206

150 nF / 50 V

Film Capacitor

C207

470 pF / 1 kV

Ceramic Capacitor

C208

470 pF / 1 kV

Ceramic Capacitor

C209

470 pF / 1 kV

Ceramic Capacitor

C210

470 pF / 1 kV

Ceramic Capacitor

C301

3.3 nF / 1 kV

AC Ceramic Capacitor

Part

Value

Note

Inductor

BEAD101

BEAD

BEAD201

5 μH

3 A

Diode

D101

1N4937

1 A, 600 V

D102

1N4937

1 A, 600 V

D103

1N4148

0.15 A, 50 V

D104

Short

D105

Open

ZD101

1N4746

18 V, 1 W

ZD102

Open

ZD201

1N5231

5.1 V, 0.5 W

D201

1N4148

0.15 A, 50 V

D202

EGP30J

3 A, 600 V

D203

EGP30D

3 A, 200 V

D204

EGP20D

2 A, 200 V

D205

EGP20D

2 A, 200 V

Bridge Diode

BD101

GSIB660

6 A, 600 V

Line Filter

LF101

14 mH

Transformer

T101

EER4042

Switch

SW201

ON/OFF

For MCU Signal

IC

IC101

FSCQ1265RT

TO-220F-5L

OPT101

FOD817A

Q201

KA431LZ

TO-92

Q202

KSC945

FSQ-Series • Rev. 1.1.3 31

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

FSCQ1565RT Typical Application Circuit

Application

Output Power

Input Voltage

Output Voltage (Max. Current)

C-TV

160 W

Universal Input

(90–270 Vac)

8.5 V (0.5 A)

15 V (0.5 A)

140 V (0.8 A)

24 V (1.5 A)

Features

 High Efficiency (>83% at 90 Vac Input)

 Wider Load Range through the Extended Quasi-Resonant Operation

 Low Standby Mode Power Consumption (<1 W)

 Low Component Count

 Enhanced System Reliability Through Various Protection Functions

 Internal Soft-Start (20 ms)

Key Design Notes

 24 V Output Designed to Drop to 8 V in Standby Mode

C103

10uF

50V

1

3

4

10

T1

EER4245

15V, 0.5A

C204

1000µF

35V

D205

EGP20D

11

LF101

C101

330nF

275VAC FUSE

250V

5.0A

C102

470µF

400V

RT101

6D-22

BD101

D103

1N4937

R103

5.1Ω

0.25W

6

7

R104

1.5kΩ

0.25W

2 4

5

1

3

GND

Drain SYNC

FB

Vcc

D106

1N4148

IC101

FSCQ1565RT

C106

47nF

50V

R105

470Ω

0.25W

C105

2.7nF

50V

ZD102

18V

1W

C107

1nF

1kV

BEAD101

D105

1N4937

C210

470pF

1kV

8.5V, 0.5A

D204

EGP20D

C205

1000µF

35V

13

C209

470pF

1kV

12

140V, 0.8A

D202

EGP30J

C201

220µF

160V

14

C207

470pF

1kV

L202

BEAD

16

C202

68µF

160V

24V, 1.5A

D203

EGP30D

C203

1000uF

35V

17

C208

470pF

1kV

18

OPTO101

FOD817A

R201

1kΩ

0.25W

C206

150nF

50V

C301

3.3nF Q201

KA431

LZ

R203

39kΩ

0.25W

R202

1kΩ

0.25W R205

240kΩ

0.25W

R204

4.7kΩ

0.25W

VR201

30kΩ

D201

1N4148

Q202

KSC945 R206

10kΩ

0.25W

R207

5.1kΩ

0.25W

SW201

15

R102

150kΩ

0.25W

R101

100kΩ

0.25W R106

1kΩ

1W

C104

10uF

50V

ZD201

5.1V

0.5W

R208

1kΩ

0.25W

Figure 47. FSCQ1265RT Typical Application Circuit Schematic

FSQ-Series • Rev. 1.1.3 32

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

EER4245

N24V

Na7

13

14

15

16

17

18

N140V/2

N8.5V

N15V

Np1

Np2

1

2

3

4

5

6

8

9 10

11

12

N140V/2

N8.5V

N140V/2

NP2

NP1

N140V/2

N24V

N15V

Na

Figure 48. Transformer Schematic Diagram

Winding Specification

No

Pin (s→f)

Wire

Turns

Winding Method

N24

18–17

0.65φ × 2

5

Space Winding

NP1

1–3

0.08φ × 20 × 2

13

Center Winding

N140V/2

16–15

0.08φ × 20 × 2

15

Center Winding

Np2

3–4

0.08φ × 20 × 2

13

Center Winding

N140V/2

15–14

0.08φ × 20 × 2

14

Center Winding

N8.5V

12–13

0.6φ × 1

2

Space Winding

N15V

11–10

0.6φ × 1

3

Space Winding

Na

7–6

0.3φ × 1

8

Space Winding

Electrical Characteristics

Specification

Remarks

Inductance

1–4

220 μH ±5%

1 kHz, 1 V

Leakage Inductance

1–4

10 μH Max.

2nd all short

Core & Bobbin

 Core: EER4245

 Bobbin: EER4245 (18 Pin)

 Ae: 201.8 mm2

FSQ-Series • Rev. 1.1.3 33

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

Bill of Materials

Part

Value

Note

Fuse

FUSE

250 V / 5 A

NTC

RT101

6D-22

Resistor

R101

100 kΩ

0.25 W

R102

150 kΩ

0.25 W

R103

5.1 Ω

0.25 W

R104

1.5 kΩ

0.25 W

R105

470 Ω

0.25 W

R106

1 kΩ

1 W

R107

Open

R201

1 kΩ

0.25 W

R202

1 kΩ

0.25 W

R203

39 kΩ

0.25 W

R204

4.7 kΩ

0.25 W, 1%

R205

240 kΩ

0.25 W, 1%

R206

10 kΩ

0.25 W

R207

5.1 kΩ

0.25 W

R208

1 kΩ

0.25 W

VR201

30 kΩ

Capacitor

C101

330 nF / 275 VAC

C102

470 μF / 400 V

Box Capacitor

C103

10 μF / 50 V

Electrolytic

C104

10 μF / 50 V

Electrolytic

C105

2.7 nF / 50 V

Electrolytic

C106

47 nF / 50 V

Film Capacitor

C107

1 nF / 1 kV

Film Capacitor

C108

Open

C201

220 μF / 160 V

Electrolytic

C202

68 μF / 160 V

Electrolytic

C203

1000 μF / 35 V

Electrolytic

C204

1000 μF / 35 V

Electrolytic

C205

1000 μF / 35 V

Electrolytic

C206

150 nF / 50 V

Film Capacitor

C207

470 pF / 1 kV

Ceramic Capacitor

C208

470 pF / 1 kV

Ceramic Capacitor

C209

470 pF / 1 kV

Ceramic Capacitor

C210

470 pF / 1 kV

Ceramic Capacitor

C301

3.3 nF / 1 kV

AC Ceramic Capacitor

Part

Value

Note

Inductor

BEAD101

BEAD

BEAD201

5 μH

3 A

Diode

D101

1N4937

1 A, 600 V

D102

1N4937

1 A, 600 V

D103

1N4148

0.15 A, 50 V

D104

Short

D105

Open

ZD101

1N4746

18 V, 1 W

ZD102

Open

ZD201

1N5231

5.1 V, 0.5 W

D201

1N4148

0.15 A, 50 V

D202

EGP30J

3 A, 600 V

D203

EGP30D

3 A, 200 V

D204

EGP20D

2 A, 200 V

D205

EGP20D

2 A, 200 V

Bridge Diode

BD101

GSIB660

6 A, 600 V

Line Filter

LF101

14 mH

Transformer

T101

EER4245

Switch

SW201

ON/OFF

For MCU Signal

IC

IC101

FSCQ1565RT

TO-220F-5L

OPT101

FOD817A

Q201

KA431LZ

TO-92

Q202

KSC945

FSQ-Series • Rev. 1.1.3 34

FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)

PCB Layout

Figure 49. Top View

Figure 50. Bottom View

NOTES:

A. EXCEPT WHERE NOTED CONFORMS TO

EIAJ SC91A.

BDOES NOT COMPLY EIAJ STD. VALUE.

C. ALL DIMENSIONS ARE IN MILLIMETERS.

D. DIMENSIONS ARE EXCLUSIVE OF BURRS,

MOLD FLASH AND TIE BAR PROTRUSIONS.

E. DIMENSION AND TOLERANCE AS PER ASME

Y14.5-1994.

F. DRAWING FILE NAME: TO220C05REV2

1 5

2 4

B

4.90

4.50

Ø3.28

3.08

B

10.36

9.96

B

2.74

2.34

0.70

0.50 (5X)

3.40

3.20

7.00

1.30 MAX (2x)

1.00 MAX (3x)

B

1.70

1.30 (3x)

1.26

B

16.07

15.67

B

11.13

10.13

B

(16.08 )

B

18.70

17.70

B

5.50

4.50

B

0.60

0.45

2.96

2.56

6.88

6.48

B

2.74

2.34

1x 45°

B

3.48

2.88

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