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DESCRIPTION

The SG1526B is a high-performance pulse width modulator for switching power supplies which offers improved functional and electrical characteristics over the industry-standard SG1526. A direct pin-for-pin replacement for the earlier device with all its features, it incorporates the following enhancements: a bandgap reference circuit for improved regulation and drift characteristics, improved undervoltage lockout, lower temperature coefficients on oscillator frequency and current-sense threshold, tighter tolerance on softstart time, much faster SHUTDOWN response, improved double-pulse supperession logic for higher speed operation, and an improved 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