SG2525AN

Overview

The SG2525AN is a voltage mode PWM controller manufactured by STMicroelectronics, designed for switching power supply applications. It operates within an 8V to 35V supply range and supports oscillator frequencies from 100Hz to 400kHz. The device features dual source/sink output drivers capable of delivering up to 500mA. It includes a trimmed 5.1V reference, adjustable dead-time control, internal soft-start, and pulse-by-pulse shutdown. Packaged in a 16-pin DIP, it supports push-pull and buck topologies with input undervoltage lockout.

Feature Summary

• Integrated error amplifier with common-mode range including the reference voltage to eliminate external resistors
• Built-in soft-start circuitry requiring only an external timing capacitor
• Pulse-by-pulse shutdown via PWM latch for instantaneous turn-off protection
• Input undervoltage lockout with hysteresis to prevent jitter-free operation during sub-normal voltages

Applications

• DC to DC conversion designs
• Push-pull switching power supplies
• Buck converter architectures
• Systems requiring synchronized oscillator inputs

Procurement Notes

Verify the specific suffix 'AN' corresponds to the 16-pin PDIP package when ordering. Confirm RoHS compliance status as per the latest manufacturer documentation. Ensure compatibility with existing PCB footprints for through-hole mounting. Check for any recent product change notices regarding assembly sites or material declarations before finalizing procurement.

Selection Notes

Select this component for designs requiring voltage mode control with integrated soft-start and shutdown features. It is suitable for applications needing a stable 5.1V reference without external trimming resistors. Consider the 500mA output drive capability for direct driver transistor interfacing. Evaluate the 100Hz to 400kHz frequency range against transformer and filter requirements.

Part Context

The SG2525AN belongs to the SG3525A series of regulating pulse width modulators. This family is engineered to improve performance while reducing external component counts in power supply designs. The SG2525 variant specifically denotes the commercial temperature grade version available in a dual in-line package, distinct from the industrial grade or surface-mount alternatives.

Replacement Considerations

UC2525AN is listed as a direct substitute by Texas Instruments.