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DESCRIPTION

BLOCK DIAGRAM

15

7

6

16

REFERENCE

+5V TO ALL

INTERNAL

OSC

(RAMP)

3

OSC OUT

Q

Q

R

+5V

12

11

13

14

9

+5V

5

4

–SENSE

+SENSE

C L

COMPENSATION

10k

1k

10

8

GROUND

+

–

+5V

E A

1

2

INV INPUT

NI INPUT

COMPARATOR

SHUTDOWN

UC1524

UC2524

UC3524

SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005

ADVANCED REGULATING PULSE WIDTH MODULATORS

•

Complete PWM Power Control Circuitry

The UC1524, UC2524 and UC3524 incorporate on a

single monolithic chip all the functions required for the

•

Uncommitted Outputs for Single-Ended or

construction of regulating power supplies, inverters or

Push-Pull Applications

switching regulators. They can also be used as the

•

Low Standby Current . . . 8 mA Typical

control element for high-power-output applications.

•

Interchangeable With SG1524, SG2524 and

The UC1524 family was designed for switching

SG3524, Respectively

regulators

of

either

polarity,

transformer-coupled

dc-to-dc converters, transformerless voltage doublers

and polarity converter applications employing fixed-

frequency, pulse-width modulation techniques. The

dual alternating outputs allow either single-ended or

push-pull applications. Each device includes an

on-chip reference, error amplifier, programmable

oscillator, pulse-steering flip-flop, two uncommitted

output

transistors,

a

high-gain

comparator,

and

current-limiting and shut-down circuitry. The UC1524

is characterized for operation over the full military

temperature range of –55

°C to 125°C. The UC2524

and UC3524 are designed for operation from –25

°C

to 85

°C and 0°C to 70°C, respectively.

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.

Copyright © 1999–2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.