SG1527AJ-JAN

Overview

The SG1527AJ-JAN is a military-grade voltage mode PWM controller manufactured by Microchip Technology. It operates within an 8V to 35V supply range and features a ±1% trimmed 5.1V reference. The device supports switching frequencies from 100 Hz to 350 kHz with a maximum duty cycle of 49%. It provides dual isolated outputs capable of sourcing or sinking 400 mA, with rise and fall times of 100 ns and 50 ns respectively. Operating temperatures span -55°C to +125°C in a CDIP-16 package.

Feature Summary

• Features a latch mechanism that prevents multiple pulses per clock cycle after any PWM termination
• Includes built-in soft-start circuitry controlled via the Shutdown pin for gradual output ramping
• Utilizes OR logic configuration resulting in a high-impedance state during shutdown conditions

Applications

• Military DC-DC step-down converter implementations
• High-reliability power supply systems requiring MIL-STD-883B compliance
• Industrial switching power supplies with strict thermal stability requirements

Procurement Notes

Verify current availability status as this component may be subject to factory special order constraints. Confirm specific revision levels and radiation data availability if required for mission-critical applications. Ensure ordering suffixes match exact military qualification requirements. Contact manufacturer directly for lead time estimation and pricing verification due to specialized procurement channels.

Selection Notes

Select this component when inverted output polarity is required compared to standard SG1525A variants. Consider the 400mA drive capability for direct transformer or MOSFET gate driving without additional buffer stages. Evaluate the 49% maximum duty cycle limitation against input-to-output voltage ratios. Verify compatibility with external synchronization signals if multi-unit phase alignment is necessary.

Part Context

This part belongs to the SG1525A/SG1527A series of regulating pulse width modulators designed for improved performance and reduced external component count. The SG1527AJ variant specifically differs from the SG1525AJ by utilizing OR logic for its output stage, providing a high-impedance state rather than a low level when disabled. Both share identical internal oscillator, error amplifier, and reference architectures.

Replacement Considerations

The SG1525AJ-JAN serves as a functional substitute where non-inverted output logic is acceptable. Cross-reference SG2527AJ and SG3527AJ for commercial and industrial temperature range equivalents. Verify pinout compatibility and logical inversion differences before substitution in existing designs.