UCC3818DWTR

Overview

The UCC3818DWTR is a BiCMOS power factor preregulator controller manufactured by Texas Instruments, housed in a 16-pin SOIC package. It operates as an average current mode PFC controller with a switching frequency range of 6 kHz to 220 kHz. The device supports a supply voltage range of 9.7 V to 18 V and functions within an operating temperature range of 0°C to 70°C. Key electrical parameters include a maximum duty cycle of 99% and a startup current of 150 µA.

Feature Summary

• Implements average current mode control for high-performance power factor correction
• Features adjustable switching frequency capability across a wide operational range
• Includes integrated soft-start functionality to manage inrush currents

Applications

• Power factor correction stages in AC-DC power supplies
• BiCMOS power factor preregulator circuits
• High-efficiency switched-mode power supply designs

Procurement Notes

Verify the specific suffix 'DWTR' confirms the tape-and-reel packaging format and industrial temperature grade. Ensure compatibility with existing PCB footprints for the 16-SOIC package. Confirm RoHS compliance status matches project requirements. Validate that the manufacturer part number aligns with the intended bill of materials before finalizing procurement orders.

Selection Notes

Select this component when average current mode control is required for improved line regulation and transient response. The wide switching frequency range allows optimization for specific filter sizes and efficiency targets. Consider the 16-SOIC package constraints for thermal management and board space availability in dense power supply layouts.

Part Context

This device belongs to the UCC3818 family of BiCMOS power factor preregulators from Texas Instruments. It serves as a specialized controller for enhancing power quality in electronic loads. The family includes variants with different packaging options such as tube or reel configurations, maintaining consistent core control logic across the series.

Replacement Considerations

The UCC2818DR is identified as a manufacturer-recommended replacement for the discontinued UCC3818PW variant. Verify pinout and parameter equivalence when substituting other family members.