LM3524 National Semiconductor, LM3524 Datasheet

LM3524

Manufacturer Part Number

LM3524

Description

Regulating Pulse Width Modulator

Manufacturer

National Semiconductor

Datasheet

1.LM3524.pdf (19 pages)

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LM2524D/LM3524D

Regulating Pulse Width Modulator

General Description

The LM3524D family is an improved version of the industry

standard LM3524. It has improved specifications and addi-

tional features yet is pin for pin compatible with existing 3524

families. New features reduce the need for additional exter-

nal circuitry often required in the original version.

The LM3524D has a

rent carrying capability of the output drive transistors has

been raised to 200 mA while reducing V

the error-amp has been raised to 5.5V to eliminate the need

for a resistive divider from the 5V reference.

In the LM3524D the circuit bias line has been isolated from

the shut-down pin. This prevents the oscillator pulse ampli-

tude and frequency from being disturbed by shut-down. Also

at high frequencies ( 300 kHz) the max. duty cycle per out-

put has been improved to 44% compared to 35% max. duty

cycle in other 3524s.

In addition, the LM3524D can now be synchronized exter-

nally, through pin 3. Also a latch has been added to insure

Block Diagram

breakdown to 60V. The common mode voltage range of

1% precision 5V reference. The cur-

CEsat

DS008650

and increasing

one pulse per period even in noisy environments. The

LM3524D includes double pulse suppression logic that in-

sures when a shut-down condition is removed the state of

the T-flip-flop will change only after the first clock pulse has

arrived. This feature prevents the same output from being

pulsed twice in a row, thus reducing the possibility of core

saturation in push-pull designs.

Features

n Fully interchangeable with standard LM3524 family

n Output current to 200 mA DC

n 60V output capability

n Wide common mode input range for error-amp

n One pulse per period (noise suppression)

n Improved max. duty cycle at high frequencies

n Double pulse suppression

n Synchronize through pin 3

1% precision 5V reference with thermal shut-down

DS008650-1

www.national.com

June 1999

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