Texas Instruments TL1451AQDR, TL1451AQD, TL1451AMJB, TL1451AMJ, TL1451AMFKB Datasheet

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, undervol­tage 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 V

CC

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

T

A

SMALL

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
V

CC

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

RTCTNC

REF

SCP

GND

NC

V

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

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

functional block diagram

+
–

+
–

Oscillator

Reference

Voltage

1/2 V

ref

R
S

170 kΩ UVLO

R

92 1

VCCRT 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, I

O

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, T

stg

–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 affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

TA = 125°C

POWER RATING

D 1088 mW 8.7 mW/°C 696 mW 566 mW 218 mW

DB 775 mW 6.2 mW/°C 496 mW 403 mW —

N 1000 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

J 1375 mW 1 1.0 mW/°C 880 mW 715 mW 275 mW

recommended operating conditions

MIN MAX UNIT

Supply voltage, V

CC

3.6 50 V

Amplifier input voltage, V

I

1.05 1.45 V

Collector output voltage, V

O

50 V

Collector output current, I

O

20 mA
Current into feedback terminal 45 µA
Feedback resistor, R

F

100 kΩ

Timing capacitor , C

T

150 15000 pF

Timing resistor , R

T

5.1 100 kΩ

Oscillator frequency 1 500 kHz

C suffix –20 85

Operating free-air temperature, T

A

Q suffix –40 125

°C

M suffix –55 125

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

4

POST 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

TL1451AC

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 V

p

p

TA = –20°C to 25°C –0.1% ±1%

Output voltage change with temperature

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

TL1451AC

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)

°

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

TL1451AC

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

TL1451C

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Frequency CT = 330 pF, RT = 10 kΩ 200 kHz
Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 10%
Frequency change with voltage VCC = 3.6 V to 40 V 1%

p

TA = –20°C to 25°C –0.4% ±2%

Frequency change with temperature

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

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Input bias current (DTC) 1 µA
Latch mode (source) current (DTC) TA = 25°C –80 –145 µA
Latched input voltage (DTC) IO = 40 µA 2.3 V

p

Zero duty cycle 2.05 2.25

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

TL1451AC

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 kΩ 70 80 dB
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing V

ref

–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

TL1451AC

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

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

Zero duty cycle 2.05 2.25

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

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C.

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

6

POST 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

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

p

p

TA = 25°C 2.40 2.50 2.60

Output voltage (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

TL1451AQ, TL1451AM

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

TL1451AQ, TL1451AM

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

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

TA = 25°C 200

Frequency

CT = 330 pF,

TA = 125°C 195

kHz

R

T

= 10

kΩ

TA = MIN 193

Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 2%

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

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

TA = 25°C 1

Input bias current (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

p

Zero duty cycle 2.05 *2.25

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.

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

error-amplifier section

TL1451AQ, TL1451AM

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 kΩ

TA = 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

TL1451AQ, TL1451AM

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

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

Zero duty cycle 2.05 *2.25

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.

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

total device

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C unless otherwise indicated.

PARAMETER MEASUREMENT INFORMATION

87654321

910111213141516

S1

C

PE

0.47 µF

Test

Input

VCC = 5 V

R

L

4.7 kΩ

4.7 kΩ

R

L

OUT1

OUT2

C

T

330 pF

R

T

10 kΩ

Test

Input

TL1451A

Figure 1. Test Circuit

Dead Time 100%

t

pe

†

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

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

0

–1

–2

–3

–25 0 25 50

afosc – Oscillator Frequency Variation – %

1

2

OSCILLATOR FREQUENCY VARIATION

vs

FREE-AIR TEMPERATURE

3

75 100

VCC = 3.6 V
RT = 10 kΩ
CT = 330 pF
f

osc

= 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 W aveform 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

10

1

10

2

10

3

10

4

10

5

Triangle W aveform Period – uS

TRIANGLE WAVEFORM PERIOD

vs

TIMING CAPACITANCE

VCC = 5 V
RT = 5.1 kΩ
TA = 25°C

sµ

10

2

10

1

10

0

10

–1

10

1

10

2

10

3

10

4

10

5

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

0

–10

– 20

– 30

– 25 0 25 50

10

20

REFERENCE OUTPUT VOLTAGE VARIATION

vs

FREE-AIR TEMPERATURE

30

75 100

VCC = 3.6 V
I

I(ref)

= 1 mA

TA – Free-Air Temperature – °C

0

–10

– 20

– 30

– 25 0 25 50

10

20

REFERENCE OUTPUT VOLTAGE VARIATION

vs

FREE-AIR TEMPERATURE

30

75 100

ОООООО

ОООООО

ОООООО

ОООООО

VCC = 40 V
I

I(ref)

= 1 mA

TA – Free-Air Temperature – °C

avref – Reference Output Voltage Variation – mV
V

O(ref)

∆

avref – Reference Output Voltage Variation – mV
V

O(ref)

∆

Figure 7 Figure 8

1.5

1

0.5

0

0 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

I

I(ref)

= 1 mA

Vref – Reference Output Voltage – V
V

O(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

0

0123

VCE – Output Collector Voltage – V

4

5

UNDERVOLTAGE LOCKOUT

HYSTERESIS CHARACTERISTICS

6

45

TA = 25°C

TA = –20°C

IO = 10 mA

7,10

8

R

L

5 V

I = I

O

V

DE

TA = 85°C

VCC – Supply Voltage – V

V

CE

2

–25 0 25 50

Undervoltage Lockout Threshold Voltage – V

2.5

3

UNDERVOLTAGE LOCKOUT CHARACTERISTIC

3.5

75 100

Threshold V oltage –V

TH

(Left Scale)

Threshold Voltage –V

TL

(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

0

0 50 100 150

tpe – Protection Enable Time – s

12

15

PROTECTION ENABLE TIME

vs

PROTECTION ENABLE CAPACITANCE

18

200 250

t

pe

CPE – Protection Enable Capacitance – µF

+

–

Protection

Latch

SR

C

PE

U.V.L.O.

ERROR AMP 1
ERROR AMP 2

1.25 V

Short-circuit

Protection

Comparator

12 kΩ

15

16

SCP V

ref

170 kΩ

V

ref

V

ref

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
R

ref

= 150 Ω

C

ref

= 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

C

x

R

ref

C

ref

V

ref

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
R

ref

= 15 Ω

C

ref

= 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

C

x

R

ref

C

ref

V

ref

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
R

ref

= 15 Ω

C

ref

= 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

C

x

R

ref

C

ref

V

ref

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
C

ref

= 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

C

ref

V

ref

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

0

0510

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

V

O(ref)

–0.01

V

O(ref)

–0.02

V

O(ref)

–0.03

V

O(ref)

–0.04

V

O(ref)

–0.05

V

O(ref)

–0.06

V

O(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)

+
–

R

L

100 kΩ

V

vom – 1

33 kΩ

33 kΩ

VCC = 3.6 V
RL = 100 kΩ
V

OM+1

= 1.25 V
VOM –1 = 1.15 V (Right Scale)
VOM –1 = 1.35 V (Left Scale)

V

ref

TEST CIRCUIT

– Maximum Output Voltage Swing – VV

OM

– Maximum Output Voltage Swing – VV

OM

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

100

0 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

0

01020

ICC (Standby) – Standby Current – mA

2

STANDBY CURRENT

vs

SUPPLY VOLTAGE

30 40

1.5

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

CC

I

TA – Free-Air Temperature – °C

Average 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 Ω

150 Ω

220 kΩ

0.47 µF

50 kΩ

R1

500 pF

pF

C5

R5

500

C1

87654321

910111213141516

330 pF

L1

R2

33 kΩ

33 kΩ

V

ref

33 kΩ

33 kΩ

470 Ω

470 Ω

L2

V

CC

Step-Up
Output

Step-Down
Output

TL1451A

NOTE A: V alues 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)

0.300A0.300
(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 ONL Y

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

10,501410,50

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

8

0,19

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

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICA TIONS IS UNDERSTOOD T O
BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright  1999, Texas Instruments Incorporated