UCC3818PWTR

Overview

The UCC3818PWTR is a BiCMOS power factor preregulator controller manufactured by Texas Instruments. It operates in average current mode to achieve high power factor correction. The device supports switching frequencies ranging from 6 kHz to 220 kHz and functions within a supply voltage range of 12 V to 17 V. It utilizes a 16-pin TSSOP package with an operating temperature range of 0°C to 70°C.

Feature Summary

• Implements average current mode control for precise power factor correction
• Features integrated soft-start circuitry to limit inrush current during startup
• Includes programmable frequency adjustment capabilities via external components

Applications

• Power factor correction stages in AC-DC power supplies
• Preregulator circuits for offline power conversion systems
• High-efficiency power factor correction modules

Procurement Notes

Verify the specific suffix 'PWTR' corresponds to the tape-and-reel packaging variant of the UCC3818 family. Confirm that the component status remains active or identify approved replacements if discontinued, as availability may vary by region and distributor.

Selection Notes

Select this component when average current mode PFC is required for improved line regulation and transient response. Ensure the design accommodates the specified 12 V to 17 V supply range and the thermal constraints of the TSSOP-16 package within the industrial temperature limits.

Part Context

This part belongs to the UCC3818 series of BiCMOS power factor preregulators. It is designed to replace older UC1854/UC2854 devices while offering enhanced performance through average current mode control and integrated protection features suitable for modern power supply designs.

Replacement Considerations

Check for manufacturer-recommended alternatives such as the UCC28180DR if the UCC3818PWTR is unavailable. Verify pin compatibility and functional equivalence before substituting.