Description

The SG3526BJ is a high-performance pulse width modulator for switching power supplies. It is an improved version of the industry-standard SG1526 with enhanced functional and electrical characteristics. The SG3526BJ offers various enhancements, including 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, 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 SG3526BJ is available for operation in different temperature ranges, including the full military ambient temperature range of -55°C to 150°C, the industrial range of -25°C to 150°C, and the commercial range of 0°C to 125°C.

Specifications and 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

Application Scenarios

The SG3526BJ can be used in various applications, including switching power supplies, single-ended or push-pull switching regulators, transformer-less and transformer-coupled designs. It is suitable for both commercial and industrial use, and it also meets the requirements for military applications.

Comparison

• Improved regulation and drift characteristics
• Enhanced undervoltage lockout
• Lower temperature coefficients on oscillator frequency and current-sense threshold
• Tighter tolerance on softstart time
• Faster SHUTDOWN response
• Improved double-pulse supperession logic for higher speed operation
• Improved output driver design with low shoot-through current
• Faster rise and fall times

No specific disadvantages have been reported for the SG3526BJ.