TL1451A

DUAL PULSEWIDTHMODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

1

www.ti.com

Total Range

Reference Supply

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

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

TA

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

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

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

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

(TOP VIEW)

19

20

1

32

17

18

16

15

14

13

12

11

9

10

5

4

6

7

8

2IN+

2IN–

NC

2FEEDBACK

2DTC

1IN+

1IN–

NC

1FEEDBACK

IDTC

FK PACKAGE

(TOP VIEW)

On products compliant to MILPRF38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.