TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Complete PWM Power Control Circuitry
D
Completely Synchronized Operation
D
Internal Undervoltage Lockout Protection
D
Wide Supply Voltage Range
D
Internal Short-Circuit Protection
D
Oscillator Frequency . . . 500 kHz Max
D
Variable Dead Time Provides Control Over
Total Range
D
Internal Regulator Provides a Stable 2.5-V
Reference Supply
D
Available in Q-Temp Automotive
HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards
description
The TL1451A incorporates on a single monolithic
chip all the functions required in the construction
of two pulse-width-modulation (PWM) control
circuits. Designed primarily for power-supply
control, the TL1451A contains an on-chip 2.5-V
regulator, two error amplifiers, an adjustable
oscillator, two dead-time comparators, undervol-
tage lockout circuitry, and dual common-emitter
output transistor circuits.
The uncommitted output transistors provide
common-emitter output capability for each
controller . The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time
control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The
on-chip oscillator can be operated by terminating RT and CT. During low VCC conditions, the undervoltage
lockout control circuit feature locks the outputs off until the internal circuitry is operational.
The TL1451AC is characterized for operation from –20°C to 85°C. The TL1451AQ is characterized for operation
from –40°C to 125°C. The TL1451AM is characterized for operation from –55°C to 125°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TASMALL
OUTLINE
(D)
SMALL
OUTLINE
(DB)†
PLASTIC DIP
(N)
SMALL
OUTLINE
(NS)
TSSOP
(PW)†
CHIP
CARRIER
(FK)
CERAMIC
DIP
(J)
–20°C to 85°C — TL1451ACDB TL1451ACN TL1451ACNS TL1451ACPW — —
–40°C to 125°C TL1451AQD — — — — — —
–55°C to 125°C — — — — — TL1451AMFK TL1451AMJ
†The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CT
RT
ERROR 1IN+
AMPLIFIER 1 1IN–
1FEEDBACK
1DTC
1OUT
GND
REF
SCP
2IN+ ERROR
2IN– AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
VCC
D, DB, N, NS, PW, OR J PACKAGE
(TOP VIEW)
1920132
17
18
16
15
14
1312119 10
5
4
6
7
8
2IN+
2IN–
NC
2FEEDBACK
2DTC
1IN+
1IN–
NC
1FEEDBACK
IDTC
RT
CT
NC
REF
SCP
GND
NC
V
2
OUT
1OUT
FK PACKAGE
(TOP VIEW)
CC
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
+
–
+
–
Oscillator
Reference
Voltage
1/2 Vref
R
S
170 kΩUVLO
R
92 1
VCC RT CT
10
16
7
8
REF
GND
PWM
COMP
PWM
COMP
12 kΩ
11
14
13
12
5
15
3
4
6
2 DTC
IN+
IN–
2 FEEDBACK
1 FEEDBACK
SCP
IN+
IN–
1 DTC
ERROR
AMPLIFIER 2
ERROR
AMPLIFIER 1 1 OUTPUT
2 OUTPUT
COMPONENT COUNT
Resistors 65
Capacitors 8
Transistors 105
JFETs 18
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range†
Supply voltage, VCC 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier input voltage, VI 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output voltage, VO 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output current, IO 21 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA C suffix –20°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Q suffix –40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M suffix –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
DISSIPATION RATING TABLE
PACKAGE TA ≤ 25°C
POWER RATING DERATING FACTOR
ABOVE TA = 25°CTA = 70°C
POWER RATING TA = 85°C
POWER RATING TA = 125°C
POWER RATING
D1088 mW 8.7 mW/°C696 mW 566 mW 218 mW
DB 775 mW 6.2 mW/°C 496 mW 403 mW —
N1000 mW 8.0 mW/°C 640 mW 520 mW —
NS 500 mW 4.0 mW/°C 320 mW 260 mW —
PW 838 mW 6.7 mW/°C 536 mW 436 mW 168 mW
FK 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW
J1375 mW 11.0 mW/°C880 mW 715 mW 275 mW
recommended operating conditions
MIN MAX UNIT
Supply voltage, VCC 3.6 50 V
Amplifier input voltage, VI1.05 1.45 V
Collector output voltage, VO50 V
Collector output current, IO20 mA
Current into feedback terminal 45 µA
Feedback resistor, RF100 kΩ
T iming capacitor, CT150 15000 pF
T iming resistor, RT5.1 100 kΩ
Oscillator frequency 1 500 kHz
C suffix –20 85
Operating free-air temperature, TAQ suffix –40 125 °C
M suffix –55 125
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)
reference section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 V
Out
p
ut voltage change with tem
p
erature
TA = –20°C to 25°C –0.1% ±1%
O
u
tp
u
t
v
oltage
change
w
ith
temperat
u
re
TA = 25°C to 85°C –0.2% ±1%
Input voltage regulation VCC = 3.6 V to 40 V 2 12.5 mV
Output voltage regulation IO = 0.1 mA to 1 mA 1 7.5 mV
Short-circuit output current VO = 0 3 10 30 mA
†All typical values are at TA = 25°C.
undervoltage lockout section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)
IO( f) =01mA T
A=25
°
C
2.6 V
Hysteresis (VCC)
I
O(ref) =
0
.
1
mA
,
T
A =
25°C
80 120 mV
Reset threshold voltage (VCC) 1.5 1.9 V
†All typical values are at TA = 25°C.
short-circuit protection control section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Input threshold voltage (SCP) TA = 25°C 0.65 0.7 0.75 V
Standby voltage (SCP) No pullup 140 185 230 mV
Latched input voltage (SCP) No pullup 60 120 mV
Input (source) current VI = 0.7 V, TA = 25°C –10 –15 –20 µA
Comparator threshold voltage (FEEDBACK) 1.18 V
†All typical values are at TA = 25°C.
oscillator section
TEST CONDITIONS
TL1451C
UNIT
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Frequency CT = 330 pF, RT = 10 kΩ200 kHz
Standard deviation of frequency CT = 330 pF, RT = 10 kΩ10%
Frequency change with voltage VCC = 3.6 V to 40 V 1%
p
TA = –20°C to 25°C –0.4% ±2%
u
y
w
u
TA = 25°C to 85°C –0.2% ±2%
†All typical values are at TA = 25°C.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Input bias current (DTC) 1µA
Latch mode (source) current (DTC) TA = 25°C–80 –145 µA
Latched input voltage (DTC) IO = 40 µA 2.3 V
In
p
ut threshold voltage atf=10kHz(DTC)
Zero duty cycle 2.05 2.25
V
Inp
u
t
threshold
v
oltage
at
f
=
10
kH
z
(DTC)
Maximum duty cycle 1.2 1.45
V
†All typical values are at TA = 25°C.
error-amplifier section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Input offset voltage VO (FEEDBACK) = 1.25 V ±6 mV
Input offset current VO (FEEDBACK) = 1.25 V ±100 nA
Input bias current VO (FEEDBACK) = 1.25 V 160 500 nA
1.05
Common-mode input voltage range VCC = 3.6 V to 40 V
1.05
to V
gg
CC
1.45
Open-loop voltage amplification RF = 200 kΩ70 80 dB
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing Vref–0.1 V
Negative output voltage swing 1 V
Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V 0.5 1.6 mA
Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V –45 –70 µA
†All typical values are at TA = 25°C.
output section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Collector off-state current VO = 50 V 10 µA
Output saturation voltage IO = 10 mA 1.2 2 V
Short-circuit output current VO = 6 V 90 mA
†All typical values are at TA = 25°C.
pwm comparator section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
In
p
ut threshold voltage atf=10kHz(FEEDBACK)
Zero duty cycle 2.05 2.25
V
Inp
u
t
threshold
v
oltage
at
f
=
10
kH
z
(FEEDBACK)
Maximum duty cycle 1.2 1.45
V
†All typical values are at TA = 25°C.
total device
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ1.7 2.4 mA
†All typical values are at TA = 25°C.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)
reference section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Out
p
ut voltage (
p
in 16)
IO=1mA
TA = 25°C 2.40 2.50 2.60
V
O
u
tp
u
t
v
oltage
(pin
16)
I
O =
1
mA
TA = MIN and 125°C 2.35 2.46 2.65
V
Output voltage change with temperature –0.63% *±4%
TA = 25°C 2.0 12.5
Input voltage regulation VCC = 3.6 V to 40 V TA = 125°C 0.7 15 mV
TA = MIN 0.3 30
TA = 25°C 1.0 7.5
Output voltage regulation IO = 0.1 mA to 1 mA TA = 125°C 0.3 14 mV
TA = MIN 0.3 20
Short-circuit output current VO = 0 3 10 30 mA
*These parameters are not production tested.
†All typical values are at TA = 25°C unless otherwise indicated.
undervoltage lockout section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
TA = 25°C 2.72
Upper threshold voltage (VCC)TA = 125°C 1.70 V
TA = MIN 3.15
TA = 25°C 2.60
Lower threshold voltage (VCC)TA = 125°C 1.65 V
TA = MIN 3.09
TA = 25°C 80 120
Hysteresis (VCC)TA = 125°C 10 50 mV
TA = MIN 10 60
TA = 25°C 1.50
Reset threshold voltage (VCC)TA = 125°C 0.95 V
TA = MIN 1.50
†All typical values are at TA = 25°C unless otherwise indicated.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
short-circuit protection control section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
TA = 25°C 650 700 750
Input threshold voltage (SCP) TA = 125°C 400 478 550 mV
TA = MIN 800 880 950
Standby voltage (SCP) 140 185 230 mV
TA = 25°C 60 120
Latched input voltage (SCP) TA = 125°C 70 120 mV
TA = MIN 60 120
Equivalent timing resistance 170 kΩ
Comparator threshold voltage (FEEDBACK) 1.18 V
†All typical values are at TA = 25°C unless otherwise indicated.
oscillator section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
C 330 F
TA = 25°C 200
Frequency CT = 330 pF,
RT=10kΩ
TA = 125°C 195 kHz
RT
=
10
kΩ
TA = MIN 193
Standard deviation of frequency CT = 330 pF, RT = 10 kΩ2%
TA = 25°C 1%
Frequency change with voltage VCC = 3.6 V to 40 V TA = 125°C 1%
TA = MIN 3%
Frequency change with temperature 1.37% *±10%
*These parameters are not production tested.
†All typical values are at TA = 25°C unless otherwise indicated.
dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
In
p
ut bias current (DTC)
TA = 25°C 1
µA
Inp
u
t
bias
c
u
rrent
(DTC)
TA = MIN and 125°C 3 µ
A
Latch mode (source) current (DTC) –80 –145 µA
TA = 25°C 2.30
Latched input voltage (DTC) TA = 125°C 2.22 2.32 V
TA = MIN 2.28 2.40
In
p
ut threshold voltage atf=10kHz(DTC)
Zero duty cycle 2.05 *2.25
V
Inp
u
t
threshold
v
oltage
at
f
=
10
kH
z
(DTC)
Maximum duty cycle *1.20 1.45
V
*These parameters are not production tested.
†All typical values are at TA = 25°C unless otherwise indicated.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
error-amplifier section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
TA = 25°C±6
Input offset voltage VO (FEEDBACK) = 1.25 V TA = 125°C±10 mV
TA = MIN ±12
TA = 25°C±100
Input offset current VO (FEEDBACK) = 1.25 V TA = 125°C±100 nA
TA = MIN ±200
TA = 25°C 160 500
Input bias current VO (FEEDBACK) = 1.25 V TA = 125°C 100 500 nA
TA = MIN 142 700
1.05
Common-mode input voltage range VCC = 3.6 V to 40 V
1.05
to V
gg
CC
1.45
TA = 25°C 70 80
Open-loop voltage amplification RF = 200 kΩTA = 125°C 70 80 dB
TA = MIN 64 80
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing 2 V
Negative output voltage swing 1 V
TA = 25°C 0.5 1.6
Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V TA = 125°C 0.4 1.8 mA
TA = MIN 0.3 1.7
TA = 25°C–45 –70
Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V TA = 125°C–25 –50 µA
TA = MIN –15 –70
†All typical values are at TA = 25°C unless otherwise indicated.
output section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Collector off-state current VO = 50 V 10 µA
TA = 25°C 1.20 2.0
Output saturation voltage TA = 125°C 1.60 2.4 V
TA = MIN 1.36 2.2
Short-circuit output current VO = 6 V 90 mA
†All typical values are at TA = 25°C unless otherwise indicated.
pwm comparator section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
In
p
ut threshold voltage atf=10kHz(FEEDBACK)
Zero duty cycle 2.05 *2.25
V
Inp
u
t
threshold
v
oltage
at
f
=
10
kH
z
(FEEDBACK)
Maximum duty cycle *1.20 1.45
V
*These parameters are not production tested.
†All typical values are at TA = 25°C unless otherwise indicated.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
total device
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX
UNIT
Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ1.7 2.4 mA
†All typical values are at TA = 25°C unless otherwise indicated.
PARAMETER MEASUREMENT INFORMATION
87654321
910111213141516
S1
CPE 0.47 µF
Test
Input VCC = 5 V RL
4.7 kΩ
4.7 kΩ
RL
OUT1
OUT2
CT
330 pF RT
10 kΩ
Test
Input
TL1451A
Figure 1. Test Circuit
Dead Time 100%
tpe†
2.0 V
1.6 V
1.4 V
1.25 V
H
L
H
L
0.6 V
0 V
H
L
3.6 V
0 V
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
Output Transistor Collector
Waveform
Protection Enable
Terminal W aveform
Short-Circuit Protection
Comparator Output
Power Supply Voltage
†Protection Enable T ime, tpe = (0.051 x 106 x Cpe) in seconds
2.8 V TYP
Figure 2. TL1451A Timing Diagram
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
100 k
10 k
1 k
1 M
1 k 4 k 10 k 40 k 100 k 400 k 1 M
TRIANGLE OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
CT = 150 pF
CT = 1500 pF
CT = 15000 pF
VCC = 5 V
TA = 25°C
RT – Timing Resistance – Ω
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–1
–2
–3
–25 0 25 50
afosc – Oscillator Frequency Variation – %
1
2
OSCILLATOR FREQUENCY VARIATION
vs
FREE-AIR TEMPERATURE
3
75 100
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
VCC = 3.6 V
RT = 10 kΩ
CT = 330 pF
fosc = 200 kHz
TA – Free-Air Temperature – °C
osc
f
∆
fosc – Triangle Oscillator Frequency – Hz
osc
f
Figure 3 Figure 4
2.2
2
1.6
1.4
0.8
2.6
1.8
Triangle Waveform Swing Voltage – V
2.4
TRIANGLE WAVEFORM SWING VOLTAGE
vs
TIMING CAPACITANCE
1.2
1
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
CT – Timing Capacitance – pF
101102103104105
Triangle Waveform Period – uS
TRIANGLE WAVEFORM PERIOD
vs
TIMING CAPACITANCE
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
sµ
102
101
100
10–1
101102103104105
CT – Timing Capacitance – pF
Figure 5 Figure 6
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–10
– 20
– 30
– 25 0 25 50
10
20
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
30
75 100
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
VCC = 3.6 V
II(ref) = 1 mA
TA – Free-Air Temperature – °C
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎÎ
0
–10
– 20
– 30
– 25 0 25 50
10
20
REFERENCE OUTPUT VOLTAGE VARIATION
vs
FREE-AIR TEMPERATURE
30
75 100
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
ÎÎÎÎÎÎ
VCC = 40 V
II(ref) = 1 mA
TA – Free-Air Temperature – °C
avref – Reference Output Voltage Variation – mV
ÁÁ
ÁÁ
ÁÁ
ÁÁ
VO(ref)
∆
avref – Reference Output Voltage Variation – mV
ÁÁ
ÁÁ
ÁÁ
ÁÁ
VO(ref)
∆
Figure 7 Figure 8
1.5
1
0.5
00 5 10 15 20 25
2
2.5
REFERENCE OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
3
30 35 40
TA = 25°C
VCC – Supply Voltage – V
0.8
0.7
0.6
– 25 0 25 50
Dropout Voltage Variation – V
0.9
1
DROPOUT VOLTAGE VARIATION
vs
FREE-TEMPERATURE
1.1
75 100
TA – Free-Air Temperature – °C
II(ref) = 1 mA
Vref – Reference Output Voltage – V
ÁÁ
ÁÁ
ÁÁ
VO(ref)
Figure 9 Figure 10
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
3
2
1
00123
VCE – Output Collector Voltage – V
4
5
UNDERVOLTAGE LOCKOUT
HYSTERESIS CHARACTERISTICS
6
45
TA = 25°CTA = –20°C
IO = 10 mA
7,10
8
RL
5 V
I = IO
VDE
TA = 85°C
VCC – Supply Voltage – V
ÁÁ
ÁÁ
ÁÁ
VCE
2
–25 0 25 50
Undervoltage Lockout Threshold Voltage – V
2.5
3
UNDERVOLTAGE LOCKOUT CHARACTERISTIC
3.5
75 100
Threshold Voltage –VTH
(Left Scale)
Threshold Voltage –VTL
(Left Scale)
Hysteresis Voltage
(Right Scale)
300
200
100
0
Undervoltage Lockout Hystersis Voltage – mV
TA – Free-Air Temperature – °C
3.25
2.75
2.25 50
150
250
Figure 11 Figure 12
1.20
1.15
1.10
– 25 0 25
Comparator Threshold Voltage – V
1.25
1.30
SHORT-CIRCUIT PROTECTION CHARACTERISTICS
50 75 100
Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)
Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)
3
2.5
2
1.5
1
RS – Latch Reset Supply Voltage – V
TA – Free-Air Temperature – °C
Figure 13
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
9
6
3
00 50 100 150
tpe – Protection Enable Time – s
12
15
PROTECTION ENABLE TIME
vs
PROTECTION ENABLE CAPACITANCE
18
200 250
tpe
CPE – Protection Enable Capacitance – µF
+
–
Protection
Latch
SR
CPE U.V.L.O.
ERROR AMP 1
ERROR AMP 2
1.25 V
Short-circuit
Protection
Comparator 12 kΩ
15 16
SCP Vref
170 kΩVref Vref
Figure 14
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1.75
1.5
1
0.75
0
2.25
1.25
1 k 10 k 100 k 1 M 10 M
Error Amp Maximum Output Voltage Swing – V
2
f – Frequency – Hz
ERROR AMP MAXIMUM OUTPUT VOLTAGE SWING
vs
FREQUENCY
0.5
0.25
VCC = 5 V
TA = 25°C
70
60
40
30
0
90
50
100 1 k 10 k 100 k 1 M 2 M
Open-Loop Voltage Amplification – dB
80
f – Frequency – Hz
OPEN-LOOP VOLTAGE AMPLIFICATION
vs
FREQUENCY
20
10
VCC = 5 V
TA = 25°C
Figure 15 Figure 16
–5
–20
1 k 10 k 100 k
G – Gain – dB
f – Frequency – Hz
GAIN (AMPLIFIER IN
UNITY-GAIN CONFIGURATION)
vs
FREQUENCY
10
1 M 10 M
5
0
–10
–15
VCC = 5 V
TA = 25°C
Figure 17
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 150 Ω
Cref = 470 pF
TA = 25°C
50
30
20
0
70
40
100 1 k 10 k 100 k 1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0°
–10°
–20°
–30°
–40°
–50°
–60°
–70°
–80°
–90°
Phase Shift
CxRref
Cref
Vref
39 kΩ
39 kΩ
+
–
Test Circuit
Figure 18
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
50
30
20
0
70
40
100 1 k 10 k 100 k 1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0°
–10°
–20°
–30°
–40°
–50°
–60°
–70°
–80°
–90°
Phase Shift
CxRref
Cref
Vref
39 kΩ
39 kΩ
+
–
Test Circuit
Figure 19
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
50
30
20
0
70
40
100 1 k 10 k 100 k 1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0°
–10°
–20°
–30°
–40°
–50°
–60°
–70°
–80°
–90°
Phase Shift
CxRref
Cref
Vref
39 kΩ
39 kΩ
+
–
Test Circuit
Figure 20
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Cref = 470 pF
TA = 25°C
50
30
20
0
70
40
100 1 k 10 k 100 k 1 M
Closed-Loop Gain – dB
60
f – Frequency – Hz
CLOSED-LOOP GAIN AND PHASE SHIFT
vs
FREQUENCY
10
0°
–10°
–20°
–30°
–40°
–50°
–60°
–70°
–80°
–90°
Phase Shift
Cref
Vref
39 kΩ
39 kΩ
+
–
Test Circuit
Figure 21
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
19
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
60
40
20
00510
Output Sink Current – mA
80
100
Collector Output Saturation Voltage – V
OUTPUT SINK CURRENT
vs
COLLECTOR OUTPUT SATURATION VOLTAGE
120
15 20
110
90
70
50
30
10
TA = –20°C
TA = 25°C
VCC = 3.6 V
TA = 85°C
Figure 22
MAXIMUM OUTPUT VOLTAGE SWING
vs
FREE-AIR TEMPERATURE
VO(ref) –0.01
VO(ref) –0.02
VO(ref) –0.03
VO(ref) –0.04
VO(ref) –0.05
VO(ref) –0.06
VO(ref) –0.07
1
0.9
0.8
0.7
0.6
0.5
–25 0 25 50 75 100
TA – Free-Air Temperature – °C
Maximum Output Voltage
Swing (Right Scale)
Maximum Output
Voltage Swing (Right Scale)
+
–RL
100 kΩ
Vvom – 1
33 kΩ
33 kΩ
VCC = 3.6 V
RL = 100 kΩ
VOM+1 = 1.25 V
VOM –1 = 1.15 V (Right Scale)
VOM –1 = 1.35 V (Left Scale)
Vref
TEST CIRCUIT
– Maximum Output Voltage Swing – VVOM
– Maximum Output Voltage Swing – VVOM
Figure 23
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
20 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
50
60
90
1000 0.5 1 1.5 2 2.5 3
Output Transistor “On” Duty Cycle – %
30
10
Dead-Time Input Voltage – V
OUTPUT TRANSISTOR ON DUTY CYCLE
vs
DEAD-TIME INPUT VOLTAGE
0
3.5 4
70
20
40
80
VCC = 3.6 V
RT = 10kΩ
CT = 330 pF
1
0.5
001020
ICC (Standby) – Standby Current – mA
2
STANDBY CURRENT
vs
SUPPLY VOLTAGE
30 40
1.5
ÁÁ
ÁÁ
CC
I
VCC – Supply Voltage – V
TA = 25°C
1.75
1.25
0.75
0.25
Figure 24 Figure 25
1
0.5
0
–25 0 25 50
ICC – Supply Current – mA
1.5
2
STANDBY CURRENT
vs
FREE-AIR TEMPERATURE
75 100
ÁÁ
ÁÁ
CC
I
TA – Free-Air Temperature – °C
A verage Supply Current
VCC = 6 V, RT = 10 kΩ,
CT = 330 pF
Stand-By Current, VCC = 40 V, No Load
Stand-By Current, VCC = 3.6 V, No Load 600
400
200
0
–25 0 25 50
Maximum Continuous Power Dissipation – mW
800
1000
MAXIMUM CONTINUOUS POWER DISSIPATION
vs
FREE-AIR TEMPERATURE
1200
75 100
1100
900
700
500
300
100
16-Pin N Plastic Dip
16-Pin NS Plastic SO
Thermal Resistance
125°C/W
Thermal Resistance
250°C/W
TA – Free-Air Temperature
1.75
1.25
0.75
0.25
Figure 26 Figure 27
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
21
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
R7
R6 C4
470 Ω
1 µF
220 Ω
C2
R4
R3
33 kΩ
33 kΩ
470 Ω150 Ω
220 kΩ
0.47 µF50 kΩ
R1
500 pF
pF
C5 R5 500
C1
87654321
910111213141516
330 pF
L1
R2
33 kΩ
33 kΩ
Vref
33 kΩ33 kΩ470 Ω
470 Ω
L2
VCC
Step-Up
Output
Step-Down
Output
TL1451A
NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.
Figure 28. High-Speed Dual Switching Regulator
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
22 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
4040047/D 10/96
0.228 (5,80)
0.244 (6,20)
0.069 (1,75) MAX 0.010 (0,25)
0.004 (0,10)
1
14
0.014 (0,35)
0.020 (0,51)
A
0.157 (4,00)
0.150 (3,81)
7
8
0.044 (1,12)
0.016 (0,40)
Seating Plane
0.010 (0,25)
PINS **
0.008 (0,20) NOM
A MIN
A MAX
DIM
Gage Plane
0.189
(4,80)
(5,00)
0.197
8
(8,55)
(8,75)
0.337
14
0.344
(9,80)
16
0.394
(10,00)
0.386
0.004 (0,10)
M
0.010 (0,25)
0.050 (1,27)
0°–8°
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
23
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
4040065 /C 10/95
28 PINS SHOWN
Gage Plane
8,20
7,40
0,15 NOM
0,63
1,03
0,25
38
12,90
12,30
28
10,50
24
8,50
Seating Plane
9,907,90
30
10,50
9,90
0,38
5,60
5,00
15
0,22
14
A
28
1
2016
6,50
6,50
14
0,05 MIN
5,905,90
DIM
A MAX
A MIN
PINS **
2,00 MAX
6,90
7,50
0,65 M
0,15
0°–8°
0,10
3,30
8
2,70
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-150
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
24 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER
4040140/C 11/95
28 TERMINALS SHOWN
B
0.358
(9,09)
MAX
(11,63)
0.560
(14,22)
0.560
0.458
0.858
(21,8)
1.063
(27,0)
(14,22)
A
NO. OF
MINMAX
0.358
0.660
0.761
0.458
0.342
(8,69)
MIN
(11,23)
(16,26)
0.640
0.740
0.442
(9,09)
(11,63)
(16,76)
0.962
1.165
(23,83)
0.938
(28,99)
1.141
(24,43)
(29,59)
(19,32)(18,78)
**
20
28
52
44
68
84
0.020 (0,51)
TERMINALS
0.080 (2,03)
0.064 (1,63)
(7,80)
0.307
(10,31)
0.406
(12,58)
0.495
(12,58)
0.495
(21,6)
0.850
(26,6)
1.047
0.045 (1,14)
0.045 (1,14)
0.035 (0,89)
0.035 (0,89)
0.010 (0,25)
12
1314151618 17
11
10
8
9
7
5
432
0.020 (0,51)
0.010 (0,25)
6
12826 27
19
21
B SQ
A SQ 22
23
24
25
20
0.055 (1,40)
0.045 (1,14)
0.028 (0,71)
0.022 (0,54)
0.050 (1,27)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold-plated.
E. Falls within JEDEC MS-004
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
25
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
J (R-GDIP-T**) CERAMIC DUAL-IN-LINE
1
20
0.290
(7,87)
0.310
0.975
(24,77)
(23,62)
0.930
(7,37)
0.245
(6,22)
(7,62)
0.300
1614
PINS **
0.290
(7,87)
0.310
0.785
(19,94)
(19,18)
0.755
(7,37)
0.310
(7,87)
(7,37)
0.290
0.755
(19,18)
(19,94)
0.785
0.245
(6,22)
(7,62)
0.300
A
0.300
(7,62)
(6,22)
0.245
A MIN
A MAX
B MAX
B MIN
C MIN
C MAX
DIM
0°–15°
Seating Plane
0.014 (0,36)
0.008 (0,20)
4040083/E 03/99
C
8
7
0.020 (0,51) MIN
B
0.070 (1,78)
0.100 (2,54)
0.065 (1,65)
0.045 (1,14)
14 LEADS SHOWN
14
0.015 (0,38)
0.023 (0,58)
0.100 (2,54)
0.200 (5,08) MAX
0.130 (3,30) MIN
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package is hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T14, GDIP1-T16, and GDIP1-T20
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
26 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
N (R-PDIP-T**) PLASTIC DUAL-IN-LINE PACKAGE
20
0.975
(24,77)
0.940
(23,88)
18
0.920
0.850
14
0.775
0.745
(19,69)
(18,92)
16
0.775
(19,69)
(18,92)
0.745
A MIN
DIM
A MAX
PINS **
0.310 (7,87)
0.290 (7,37)
(23,37)
(21,59)
Seating Plane
0.010 (0,25) NOM
14/18 PIN ONLY
4040049/C 08/95
9
8
0.070 (1,78) MAX
A
0.035 (0,89) MAX 0.020 (0,51) MIN
16
1
0.015 (0,38)
0.021 (0,53)
0.200 (5,08) MAX
0.125 (3,18) MIN
0.240 (6,10)
0.260 (6,60)
M
0.010 (0,25)
0.100 (2,54) 0°–15°
16 PINS SHOWN
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001 (20-pin package is shorter than MS-001).
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
27
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
NS (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
4040062/B 02/95
14 PINS SHOWN
2,00 MAX
A
0,05 MIN
Seating Plane
1,05
0,55
1
14
PINS **
5,60
5,00
7
8,20
7,40
8
A MIN
A MAX
DIM
Gage Plane
0,15 NOM
0,25
9,90 9,90
10,50
14
10,50
16
12,30 14,70
15,3012,90
20 24
0,10
1,27
0°–10°
M
0,25
0,35
0,51
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0,15.
TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
28 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL DATA
PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,65 M
0,10
0,10
0,25
0,50
0,75
0,15 NOM
Gage Plane
28
9,80
9,60
24
7,90
7,70
2016
6,60
6,40
4040064/F 01/97
0,30
6,60
6,20
80,19
4,30
4,50
7
0,15
14
A
1
1,20 MAX
14
5,10
4,90
8
3,10
2,90
A MAX
A MIN
DIM PINS **
0,05
4,90
5,10
Seating Plane
0°–8°
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
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Copyright 1999, Texas Instruments Incorporated