UCC38502N

Overview

The UCC38502N is a BiCMOS Power Factor Correction (PFC) and Pulse Width Modulation (PWM) combination controller manufactured by Texas Instruments. It integrates a PFC controller with a post-regulator PWM controller in a single package, designed for high-efficiency power supplies. The device operates within an industrial temperature range of 0 to 70 degrees Celsius and utilizes a 20-pin Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Integrates average current mode PFC control with a PWM controller for combined power factor correction and voltage regulation.
• Features a dedicated post-regulator output to provide stable bias voltage for the PFC stage independent of input line variations.
• Supports continuous conduction mode (CCM) operation for the PFC stage to ensure high power factor performance.

Applications

• Offline power supplies requiring high power factor correction
• Computer and peripheral power supplies
• Telecommunications power systems

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature rating. Ensure the component matches the required pinout and electrical specifications for the target design. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and availability status.

Selection Notes

Select this component when a single-chip solution for both PFC and PWM control is required to reduce board space and component count. Consider the integration of the post-regulator if a stable auxiliary supply is needed for the PFC controller without external circuitry complexity.

Part Context

This component belongs to the UC385x series of power factor preregulators from Texas Instruments. These controllers are designed to meet regulatory requirements for harmonic distortion in AC-DC conversion applications. The series typically includes variants with different modulation schemes or operating frequencies.

Replacement Considerations

Public confirmed substitute part numbers: UCC38502DW, UCC38502DW G4, UCC38502DW TR, UCC38502DW TRG4.