
   
SLVS024E – FEBRUAR Y 1983 – REVISED NOVEMBER 1999
1
www.ti.com
DComplete PWM Power Control Circuitry
DCompletely Synchronized Operation
DInternal Undervoltage Lockout Protection
DWide Supply Voltage Range
DInternal Short-Circuit Protection
DOscillator Frequency ...500 kHz Max
DVariable Dead Time Provides Control Over
Total Range
DInternal Regulator Provides a Stable 2.5-V
Reference Supply
DAvailable 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 TL1451ACD 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        
         
       
   
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
        
       
        

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
2www.ti.com
functional block diagram
+
+
Oscillator
Reference
Voltage
1/2 Vref
R
S
170 kUVLO
R
92 1
VCC RT CT
10
16
7
8
REF
GND
PWM
COMP
PWM
COMP
12 k
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

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
3
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absolute maximum ratings over operating free-air temperature range
Supply voltage, VCC 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier input voltage, VI20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output voltage, VO51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output current, IO21 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 , an d
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 affect 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 k
Timing capacitor, CT150 15000 pF
Timing resistor, RT5.1 100 k
Oscillator frequency 1 500 kHz
C suffix 20 85
Operating free-air temperature, TAQ suffix 40 125 °C
g,
A
M suffix 55 125

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
4www.ti.com
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 TYPMAX UNIT
Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 V
O tp t oltage change ith temperat re
TA = 20°C to 25°C0.1% ±1%
Output voltage change with temperature TA = 25°C to 85°C0.2% ±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 TYPMAX UNIT
Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)
IO( f) 01mA T
A25°C
2.6 V
Hysteresis (VCC)IO(ref) = 0.1 mA, TA = 25°C80 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
TL1451AC
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX 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°C10 15 20 µA
Comparator threshold voltage (FEEDBACK) 1.18 V
All typical values are at TA = 25°C.
oscillator section
PARAMETER
TEST CONDITIONS
TL1451C
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
Frequency CT = 330 pF, RT = 10 k200 kHz
Standard deviation of frequency CT = 330 pF, RT = 10 k10%
Frequency change with voltage VCC = 3.6 V to 40 V 1%
Frequency change with tem
p
erature
TA = 20°C to 25°C0.4% ±2%
Frequency change with temperature TA = 25°C to 85°C0.2% ±2%
All typical values are at TA = 25°C.

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
5
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dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
Input bias current (DTC) 1µA
Latch mode (source) current (DTC) TA = 25°C80 145 µA
Latched input voltage (DTC) IO = 40 µA 2.3 V
In
p
ut threshold voltage at f 10 kHz (DTC)
Zero duty cycle 2.05 2.25
V
Input threshold voltage at f = 10 kHz (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 TYPMAX 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 volta
g
e ran
g
e V
CC
= 3.6 V to 40 V
1
.
05
to V
Common mode
in ut
voltage
range
VCC
=
3
.
6
V
to
40
V
to
1.45
V
Open-loop voltage amplification RF = 200 k70 80 dB
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing Vref0.1 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 TYPMAX 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 TYPMAX UNIT
In
p
ut threshold voltage at f 10 kHz (FEEDBACK)
Zero duty cycle 2.05 2.25
V
Input threshold voltage at f = 10 kHz (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 TYPMAX UNIT
Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 k1.7 2.4 mA
All typical values are at TA = 25°C.

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
6www.ti.com
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 TYPMAX UNIT
O tp t oltage (pin 16)
I1mA
TA = 25°C 2.40 2.50 2.60
V
Output voltage (pin 16) IO = 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
In ut
voltage
regulation
VCC
3.6
V
to
40
V
TA = MIN 0.3 30
mV
TA = 25°C 1.0 7.5
Output voltage regulation IO = 0.1 mA to 1 mA TA = 125°C 0.3 14 mV
Out ut
voltage
regulation
IO
0.1
mA
to
1
mA
TA = MIN 0.3 20
mV
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 TYPMAX UNIT
TA = 25°C 2.72
Upper threshold voltage (VCC)TA = 125°C 1.70 V
Uer
threshold
voltage
(VCC)
TA = MIN 3.15
V
TA = 25°C 2.60
Lower threshold voltage (VCC)TA = 125°C 1.65 V
Lower
threshold
voltage
(VCC)
TA = MIN 3.09
V
TA = 25°C 80 120
Hysteresis (VCC)TA = 125°C 10 50 mV
Hysteresis
(VCC)
TA = MIN 10 60
mV
TA = 25°C 1.50
Reset threshold voltage (VCC)TA = 125°C 0.95 V
g(CC)
TA = MIN 1.50
All typical values are at TA = 25°C unless otherwise indicated.

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
7
www.ti.com
short-circuit protection control section
PARAMETER
TL1451AQ, TL1451AM
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
TA = 25°C 650 700 750
Input threshold voltage (SCP) TA = 125°C 400 478 550 mV
In ut
threshold
voltage
(SCP)
TA = MIN 800 880 950
mV
Standby voltage (SCP) 140 185 230 mV
TA = 25°C 60 120
Latched input voltage (SCP) TA = 125°C 70 120 mV
Latched
in ut
voltage
(SCP)
TA = MIN 60 120
mV
Equivalent timing resistance 170 k
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 TYPMAX UNIT
C 330 F
TA = 25°C 200
Frequency CT = 330 pF,
RT=10k
TA = 125°C 195 kHz
Frequency
R
T =
10
k
TA = MIN 193
kHz
Standard deviation of frequency CT = 330 pF, RT = 10 k2%
TA = 25°C 1%
Frequency change with voltage VCC = 3.6 V to 40 V TA = 125°C 1%
Frequency
change
with
voltage
VCC
3.6
V
to
40
V
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 TYPMAX UNIT
Inp t bias c rrent (DTC)
TA = 25°C 1
A
Input bias current (DTC) TA = MIN and 125°C 3 µA
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
Latched
in ut
voltage
(DTC)
TA = MIN 2.28 2.40
V
In
p
ut threshold voltage at f 10 kHz (DTC)
Zero duty cycle 2.05 *2.25
V
Input threshold voltage at f = 10 kHz (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.

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
8www.ti.com
error-amplifier section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
TA = 25°C±6
Input offset voltage VO (FEEDBACK) = 1.25 V TA = 125°C±10 mV
In ut
offset
voltage
TA = MIN ±12
mV
TA = 25°C±100
Input offset current VO (FEEDBACK) = 1.25 V TA = 125°C±100 nA
In ut
offset
current
TA = MIN ±200
nA
TA = 25°C 160 500
Input bias current VO (FEEDBACK) = 1.25 V TA = 125°C 100 500 nA
In ut
bias
current
TA = MIN 142 700
nA
1.05
Common-mode input volta
g
e ran
g
e V
CC
= 3.6 V to 40 V
1
.
05
to V
Common mode
in ut
voltage
range
VCC
=
3
.
6
V
to
40
V
to
1.45
V
TA = 25°C 70 80
Open-loop voltage amplification RF = 200 kTA = 125°C 70 80 dB
O en loo
voltage
am lification
TA = MIN 64 80
dB
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
Out ut
(sink)
current
(FEEDBACK)
TA = MIN 0.3 1.7
mA
TA = 25°C45 70
Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V TA = 125°C25 50 µA
() ( )
TA = MIN 15 70
µ
All typical values are at TA = 25°C unless otherwise indicated.
output section
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX 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
Out ut
saturation
voltage
TA = MIN 1.36 2.2
V
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 TYPMAX UNIT
In
p
ut threshold voltage at f 10 kHz (FEEDBACK)
Zero duty cycle 2.05 *2.25
V
Input threshold voltage at f = 10 kHz (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.

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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total device
PARAMETER
TEST CONDITIONS
TL1451AQ, TL1451AM
UNIT
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 k1.7 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 k
4.7 k
RL
OUT1
OUT2
CT
330 pF RT
10 k
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 Waveform
Short-Circuit Protection
Comparator Output
Power Supply Voltage
Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds
2.8 V TYP
Figure 2. TL1451A Timing Diagram

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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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
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 k
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 k
TA = 25°C
CT Timing Capacitance pF
101102103104105
Triangle Waveform Period uS
TRIANGLE WAVEFORM PERIOD
vs
TIMING CAPACITANCE
VCC = 5 V
RT = 5.1 k
TA = 25°C
sµ
102
101
100
101
101102103104105
CT Timing Capacitance pF
Figure 5 Figure 6

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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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

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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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

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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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 k
15 16
SCP Vref
170 kVref Vref
Figure 14

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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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

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
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TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 150
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 k
39 k
+
Test Circuit
Figure 18

   
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
16 www.ti.com
TYPICAL CHARACTERISTICS
47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15
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 k
39 k
+
Test Circuit
Figure 19