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