SG3526BDW データシートの表示（PDF） - Microsemi Corporation

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SG3526BDW

REGULATING PULSE WIDTH MODULATOR

Microsemi Corporation 

SG1526B/SG2526B/SG3526B

REGULATING PULSE WIDTH MODULATOR

DESCRIPTION

The SG1526B is a high-performance pulse width modulator for switching

power supplies which offers improved functional and electrical characteris-

tics over the industry-standard SG1526. A direct pin-for-pin replacement for

the earlier device with all its features, it incorporates the following enhance-

ments: a bandgap reference circuit for improved regulation and drift

characteristics, improved undervoltage lockout, lower temperature coeffi-

cients on oscillator frequency and current-sense threshold, tighter toler-

ance on softstart time, much faster SHUTDOWN response, improved

double-pulse supperession logic for higher speed operation, and an im-

proved output driver design with low shoot-through current, and faster rise

and fall times. This versatile device can be used to implement single-ended

or push-pull switching regulators of either polarity, both transformer-less

and transformer-coupled. The SG1526B is specified for operation over the

full military ambient temperature range of -55°C to 150°C. The SG2526B

is characterized for the industrial range of -25°C to 150°C, and the SG3526B

is designed for the commercial range of 0°C to 125°C.

FEATURES

• 8 to 35 volt operation

• 5V low drift 1% bandgap reference

• 1Hz to 500KHz oscillator range

• Dual 100mA source/sink

• Digital current limiting

• Double pulse suppression

• Programmable deadtime

• Improved undervoltage lockout

• Single pulse metering

• Programmable soft-start

• Wide current limit common mode range

• TTL/CMOS compatible logic ports

• Symmetry correction capability

• Guaranteed 6 unit synchronization

• Shoot thru currents less than 100mA

• Improved shutdown delay

• Improved rise and fall time

HIGH RELIABILITY FEATURES - SG1526B

♦ Available to MIL-STD-883

♦ MIL-M38510/12603BVA - JAN1526BJ

♦ Radiation data available

♦ LMI level "S" processing available

BLOCK DIAGRAM

VREF

+VIN

GROUND

RD

RT

CT

Reference

Regulator

Undervoltage

Lockout

Oscillator

To Internal

Circuitry

SYNC

+VC

OUTPUT A

RESET

CSOFTSTART

COMPENSATION

+ ERROR

— ERROR

+ C.S.

— C.S.

Soft

Start

+VIN

Amp

S

Q

D

Q

S

RQ

MEMORY

F/F

Q

T

Q

TOGGLE

F/F

METERING

F/F

OUTPUT B

SHUTDOWN

Rev 1.1a 3.19.2005

Copyright © 1994

Microsemi Inc.

11861 Western Avenue ∞ Garden Grove, CA 92841

1

(714) 898-8121 ∞ FAX: (714) 893-2570

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