TL1454A, TL1454AY

DUALCHANNEL PULSEWIDTHMODULATION (PWM)

CONTROL CIRCUIT

SLVS423 A− MAY 2002 − REVISED SEPTEMBER 2002

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Two Complete PWM Control Circuits

D Outputs Drive MOSFETs Directly

D Oscillator Frequency...50 kHz to 2 MHz

D 3.6-V to 20-V Supply-Voltage Range

D Low Supply Current . . . 3.5 mA Typ

D Adjustable Dead-Time Control, 0% to 100%

D 1.26-V Reference

description

The TL1454A is a dual-channel pulse-width-mod-

ulation (PWM) control circuit, primarily intended

for low-power, dc/dc converters. Applications

include LCD displays, backlight inverters, note-

book computers, and other products requiring

small, high-frequency, dc/dc converters.

Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET

driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both

channels.

Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is

configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set

with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100%

duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time

control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the

TL1454A to be used in ground-sensing battery chargers as well as voltage converters.

AVAILABLE OPTIONS

PACKAGED DEVICES†

CHIP FORM

TA

SMALL OUTLINE

(D)

PLASTIC DIP

(N)

TSSOP

(PW)

SSOP

(DB)

SOP-EIAJ

(NS)

CHIP FORM

(Y)

−20

°C to 85°C

TL1454ACD

TL1454ACN

TL1454ACPWR

TL1454ACDB

TL1454ACNS

TL1454AY

† The D, DB and NS packages are available taped and reeled. Add the suffix R to the device name (e.g., TL1454ACDR). The PW package is

available only left-end taped and reeled (indicated by the R suffix on the device type; e.g., TL1454ACPWR).

Copyright

 2002, 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.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CT

RT

DTC1

IN1 +

IN1 −

COMP1

GND

OUT1

D, N OR PW PACKAGE

(TOP VIEW)

REF

SCP

DTC2

IN2 +

IN2 −

COMP2

VCC

OUT2