UCC28521DWRG4

Overview

The UCC28521DWRG4 is an integrated Power Factor Correction (PFC) and Pulse Width Modulation (PWM) controller manufactured by Texas Instruments. It combines average current mode control for the PFC stage with a PWM controller for the secondary side, utilizing Transition-Edge Modulation (TEM). The device operates within a supply voltage range of 9.7V to 18V and supports a switching frequency up to 200kHz. It is housed in a 20-pin SOIC package and is rated for operation between -40°C and +105°C.

Feature Summary

• Integrates average current mode PFC controller with CCM boundary detection
• Combines PWM controller with transition-edge modulation for reduced EMI
• Includes built-in protection features such as overvoltage and undervoltage lockout

Applications

• High-efficiency power factor correction stages in AC-DC converters
• Flyback or forward converter primary-side control
• Universal input power supplies for consumer electronics

Procurement Notes

Verify the complete part number including the RG4 suffix to ensure compliance with RoHS standards and lead-free manufacturing processes. Confirm that the 20-SOIC package dimensions match your PCB footprint requirements. Check for any recent product change notifications regarding pinout or electrical characteristics before finalizing design integration.

Selection Notes

Select this component when a single-chip solution for both PFC and PWM control is required to reduce bill of materials count. It is suitable for applications demanding high power factor and low total harmonic distortion. Ensure the input voltage range aligns with the 9.7V to 18V operating specification during startup and normal operation phases.

Part Context

This device belongs to the UCC285xx family of combination controllers from Texas Instruments. These parts are designed to simplify the design of isolated AC-DC power supplies by integrating critical control functions into a single IC. The DWRG4 designation indicates a specific tape-and-reel packaging format for surface-mount assembly.

Replacement Considerations

The UCC28501DWG4 is a documented substitute within the same manufacturer's portfolio offering similar combination control functionality.