DESCRIPTION

The SG1526 is a high-performance monolithic pulse width

modulator circuit designed for fixed-frequency switching

regulators and other power control applications. Included

in an 18-pin dual-in-line package are a temperature

compensated voltage reference, sawtooth oscillator, error

amplifier, pulse width modulator, pulse metering and

steering logic, and two low impedance power drivers. Also

included are protective features such as soft-start and

undervoltage lockout, digital current limiting, double pulse

inhibit, a data latch for single pulse metering, adjustable

deadtime, and provision for symmetry correction inputs.

For ease of interface, all digital control ports are TTL and

B-series CMOS compatible. Active LOW logic design

allows wired-OR connections for maximum flexibility. This

versatile device can be used to implement single-ended or

push-pull switching regulators of either polarity, both

transformerless and transformer coupled. The SG1526 is

characterized for operation over the full military ambient

junction temperature range of -55°C to +150°C. The

SG2526 is characterized for operation from -25°C to

+150°C, and the SG3526 is characterized for operation

from 0°C to +125°C.

FEATURES

8V to 35V Operation

5V Reference Trimmed to ±1%

1Hz to 350kHz Oscillator Range

Dual 100mA Source/Sink Outputs

Digital Current Limiting

Double Pulse Suppression

Programmable Deadtime

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

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HIGH RELIABILITY FEATURES

Available to MIL-STD-883, ¶ 1.2.1

Available to DSCC - Standard Microcircuit

Drawing (SMD)

Radiation data available

MSC-AMS level S processing available

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