SG1525AJ-883B

Overview

The SG1525AJ-883B is a regulating pulse width modulator designed for switching power supplies. It features a +5.1 V reference trimmed to ±1% accuracy and an error amplifier with input common-mode range including the reference voltage. The device supports operation from 8V to 35V with a maximum switching frequency of 500kHz. Output stages are totem-pole designs capable of sourcing or sinking over 200mA, utilizing NOR logic for low output in the OFF state.

Feature Summary

• Integrated soft-start circuitry requiring only an external timing capacitor
• Synchronization input allows slaving multiple units or locking to an external clock
• Built-in latch following the comparator maintains outputs off for the remainder of the period after termination
• Undervoltage lockout keeps outputs off and discharges soft-start capacitor during insufficient input voltage

Applications

• Switching power supply implementations
• UPS uninterrupted power systems
• Motor drive systems
• Industrial automation equipment

Procurement Notes

Verify that the specific ordering suffix matches the required military or aerospace qualification standards associated with the 883B designation. Confirm package integrity and pin configuration alignment with existing PCB layouts. Ensure compatibility with system voltage ranges and thermal requirements before finalizing procurement orders.

Selection Notes

Select this component when NOR logic output behavior is required for the OFF state. Consider the wide deadtime adjustment range provided by the single resistor between CT and Discharge pins. Evaluate the need for synchronization capabilities if multiple units must be slaved together or synchronized to an external system clock.

Part Context

This part belongs to the SG1525A/1527A series of pulse width modulators. While the SG1525A uses NOR logic, the SG1527A variant utilizes OR logic, resulting in a HIGH output level when OFF. Both series share similar internal architectures but differ in output stage logic configurations.

Replacement Considerations

SG1525AJ/JAN

FAQ

How does the output stage logic function?

The SG1525A output stage features NOR logic, which provides a LOW output signal for the OFF state.

What is the purpose of the sync input?

The sync input allows multiple units to be slaved together or enables a single unit to be synchronized to an external system clock.