TEXAS INSTRUMENTS TL1451A Technical data

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TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

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.

ERROR 1IN+

AMPLIFIER 1 1IN–

1FEEDBACK

D, DB, N, NS, PW, OR J PACKAGE

1FEEDBACK

1DTC
1OUT

1IN+
1IN–

NC

IDTC

CT
RT

GND

RTCTNC

4
5
6
7
8

1OUT

(TOP VIEW)

16

1

15

2

14

3

13

4

12

5

11

6

10

7
8

FK PACKAGE

(TOP VIEW)

9

REF

NC

GND

V

REF
SCP
2IN+ ERROR
2IN– AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
V

CC

SCP

1920132

2IN+

18

2IN–

17

NC

16

2FEEDBACK

15

2DTC

14

1312119 10

CC

OUT

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

conditions, the undervoltage

CC

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

–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).

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.

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.

SMALL

OUTLINE

(D)

SMALL

OUTLINE

(DB)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

†

PLASTIC DIP

(N)

SMALL

OUTLINE

(NS)

TSSOP

†

(PW)

Copyright  1999, Texas Instruments Incorporated

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.

CHIP

CARRIER

(FK)

CERAMIC

DIP

(J)

1

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

functional block diagram

VCCRT CT

2 DTC

11

92 1

ERROR

AMPLIFIER 2

2 FEEDBACK

1 FEEDBACK

ERROR

AMPLIFIER 1

IN+
IN–

SCP

IN+
IN–

1 DTC

14
13
12

5

15

3
4

6

+
–

PWM
COMP

PWM
COMP

R
S

Oscillator

R

1/2 V

ref

Reference

12 kΩ

170 kΩ UVLO

+
–

Resistors 65
Capacitors 8
Transistors 105
JFETs 18

Voltage

COMPONENT COUNT

10

2 OUTPUT

16

REF

7

1 OUTPUT

8

GND

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

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

21 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

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

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

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

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

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

recommended operating conditions

MIN MAX UNIT

Supply voltage, V
Amplifier input voltage, V
Collector output voltage, V
Collector output current, I
Current into feedback terminal 45 µA
Feedback resistor, R
Timing capacitor , C
Timing resistor , R
Oscillator frequency 1 500 kHz

Operating free-air temperature, T

CC

T

I

O

O

F

T

C suffix –20 85

A

Q suffix –40 125
M suffix –55 125

3.6 50 V

1.05 1.45 V
50 V
20 mA

100 kΩ
150 15000 pF

5.1 100 kΩ

°C

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Output voltage change with temperature

PARAMETER

TEST CONDITIONS

UNIT

I

T

25°C

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Frequency change with temperature

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AC

MIN

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

p

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.

p

TA = –20°C to 25°C –0.1% ±1%
TA = 25°C to 85°C –0.2% ±1%

undervoltage lockout section

MIN

Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)
Hysteresis (VCC)
Reset threshold voltage (VCC) 1.5 1.9 V

†

All typical values are at TA = 25°C.

O(ref)

= 0.1 mA,

°

=

A

80 120 mV

†

TYP

TL1451AC

†

TYP

2.6 V

MAX

MAX

short-circuit protection control section

TL1451AC

MIN TYP†MAX

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

MIN TYP†MAX

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

†

All typical values are at TA = 25°C.

TA = –20°C to 25°C –0.4% ±2%
TA = 25°C to 85°C –0.2% ±2%

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(DTC)

V

PARAMETER

TEST CONDITIONS

UNIT

1.05

gg

CC

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(FEEDBACK)

V

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

dead-time control section

TL1451AC

MIN TYP†MAX

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

†

All typical values are at TA = 25°C.

= 10 kHz

error-amplifier section

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

Common-mode input voltage range VCC = 3.6 V to 40 V

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
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.

Zero duty cycle 2.05 2.25
Maximum duty cycle 1.2 1.45

TL1451AC

MIN TYP†MAX

1.05
to

1.45

–0.1 V

ref

V

output section

TL1451AC

MIN TYP†MAX

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

MIN TYP†MAX

p

†

All typical values are at TA = 25°C.

= 10 kHz

Zero duty cycle 2.05 2.25
Maximum duty cycle 1.2 1.45

total device

TL1451AC

MIN TYP†MAX

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Output voltage (pin 16)

I

mA

V

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AQ, TL1451AM

MIN

p

Output voltage change with temperature –0.63% *±4%

Input voltage regulation VCC = 3.6 V to 40 V

Output voltage regulation IO = 0.1 mA to 1 mA

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.

p

O

= 1

TA = 25°C 2.40 2.50 2.60
TA = MIN and 125°C 2.35 2.46 2.65

TA = 25°C 2.0 12.5
TA = 125°C 0.7 15
TA = MIN 0.3 30
TA = 25°C 1.0 7.5
TA = 125°C 0.3 14
TA = MIN 0.3 20

TYP

†

MAX

mV

mV

undervoltage lockout section

Upper threshold voltage (VCC)

Lower threshold voltage (VCC)

Hysteresis (VCC)

Reset threshold voltage (VCC)

†

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

TL1451AQ, TL1451AM

MIN

TYP

TA = 25°C 2.72
TA = 125°C 1.70
TA = MIN 3.15
TA = 25°C 2.60
TA = 125°C 1.65
TA = MIN 3.09
TA = 25°C 80 120
TA = 125°C 10 50
TA = MIN 10 60
TA = 25°C 1.50
TA = 125°C 0.95
TA = MIN 1.50

†

MAX

V

V

mV

V

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

R

T

kΩ

PARAMETER

TEST CONDITIONS

UNIT

Input bias current (DTC)

A

Input threshold voltage at f

(DTC)

V

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

short-circuit protection control section

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C 650 700 750

Input threshold voltage (SCP)

Standby voltage (SCP) 140 185 230 mV

Latched input voltage (SCP)

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

Frequency

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

Frequency change with voltage VCC = 3.6 V to 40 V

Frequency change with temperature 1.37% *±10%

*These parameters are not production tested.
†

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

CT = 330 pF,

TA = 125°C 400 478 550
TA = MIN 800 880 950

TA = 25°C 60 120
TA = 125°C 70 120
TA = MIN 60 120

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C 200

= 10

TA = 125°C 195
TA = MIN 193

TA = 25°C 1%
TA = 125°C 1%
TA = MIN 3%

mV

mV

kHz

dead-time control section

TL1451AQ, TL1451AM

MIN TYP†MAX

p

Latch mode (source) current (DTC) –80 –145 µA

Latched input voltage (DTC)

p

*These parameters are not production tested.
†

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

= 10 kHz

TA = 25°C 1
TA = MIN and 125°C 3

TA = 25°C 2.30
TA = 125°C 2.22 2.32
TA = MIN 2.28 2.40
Zero duty cycle 2.05 *2.25
Maximum duty cycle *1.20 1.45

µ

V

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

1.05

gg

CC

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(FEEDBACK)

V

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

error-amplifier section

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C ±6

Input offset voltage VO (FEEDBACK) = 1.25 V

Input offset current VO (FEEDBACK) = 1.25 V

Input bias current VO (FEEDBACK) = 1.25 V

Common-mode input voltage range VCC = 3.6 V to 40 V

Open-loop voltage amplification RF = 200 kΩ

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

Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V

Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V

†

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

TA = 125°C ±10
TA = MIN ±12
TA = 25°C ±100
TA = 125°C ±100
TA = MIN ±200
TA = 25°C 160 500
TA = 125°C 100 500
TA = MIN 142 700

1.05
to

1.45

TA = 25°C 70 80
TA = 125°C 70 80
TA = MIN 64 80

TA = 25°C 0.5 1.6
TA = 125°C 0.4 1.8
TA = MIN 0.3 1.7
TA = 25°C –45 –70
TA = 125°C –25 –50
TA = MIN –15 –70

mV

nA

nA

V

dB

mA

µA

output section

TL1451AQ, TL1451AM

MIN TYP†MAX

Collector off-state current VO = 50 V 10 µA

TA = 25°C 1.20 2.0

Output saturation voltage

Short-circuit output current VO = 6 V 90 mA

†

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

TA = 125°C 1.60 2.4
TA = MIN

1.36 2.2

pwm comparator section

TL1451AQ, TL1451AM

MIN TYP†MAX

p

*These parameters are not production tested.
†

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

= 10 kHz

Zero duty cycle 2.05 *2.25
Maximum duty cycle *1.20 1.45

V

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

total device

TL1451AQ, TL1451AM

MIN TYP†MAX

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

S1

C

PE

C

330 pF

0.47 µF

T

Figure 1. Test Circuit

Oscillator Triangle Waveform

Error Amplifier Output

Dead-Time Input Voltage

Short-Circuit Protection

Comparator Input Voltage

PWM Comparator Output Voltage

Output Transistor Collector

Protection Enable

Terminal Waveform

Short-Circuit Protection

Comparator Output

Power Supply Voltage

†

Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds

Waveform

2.8 V TYP

TL1451A

R

T

10 kΩ

Test

Input

Test

Input

VCC = 5 V

910111213141516

87654321

R

L

4.7 kΩ

R

L

4.7 kΩ

OUT1

OUT2

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

Figure 2. TL1451A Timing Diagram

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

9