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