TL1454, TL1454Y

DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)

CONTROL CIRCUIT

SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997

1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

description

The TL1454 is a dual-channel pulse-width-modu-

lation (PWM) control circuit, primarily intended for

low-power, dc/dc converters. Applications include

LCD displays, backlight inverters, notebook com-

puters, 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

TL1454 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)

CHIP FORM

(Y)

–20

°C to 85°C

TL1454CD

TL1454CN

TL1454CPWLE

TL1454Y

–40

°C to 85°C

TL1454ID

TL1454IN

—

—

† The D package is available taped and reeled. Add the suffix R to the device name (e.g., TL1454CDR). The

PW package is available only left-end taped and reeled (indicated by the LE suffix on the device type; e.g.,

TL1454CPWLE).

Copyright

© 1997, 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

OUT2