UTCTL1451

LINEAR INTEGRATED CIRCUIT

1

QW-R103-011,A

DUAL PULSE-WIDTH-MODULATION

CONTROL CIRCUITS

DESCRIPTION

The UTC TL1451 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 TL1451 contains an on-chip 2.5V

regulator, two error amplifiers, an adjustable oscillator, two

dead-time comparators, undervoltage lockout circuitry, and

dual common –emitter output transistor circuits.

FEATURES

*Complete PWM Power control Circuitry

*Completely Synchronized Operation

*Internal Undervoltage Lockout Protection

*Wide Supply Voltage Range

*Internal Short-Circuit Protection

*Oscillator Frequency …500kHz Max

*Variable Dead Time Provides Control Over Total Range

*Internal Regulator Provides a Stable 2.5V Reference Supply

DIP-16

SOP-16

PIN CONFIGURATIONS

CT

RT

1 IN+

1 IN-

1 FEEDBACK

1 DTC

1 OUT

GND

Vcc

2 OUT

2 DTC

2 IN-

SCP

REF

2 IN+

2 FEEDBACK

ERROR

AMPLIFIER

1

ERROR

AMPLIFIER

2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16