UCC3817DWTR

Overview

The UCC3817DWTR is a current-mode power factor correction controller manufactured by Texas Instruments. It operates within a supply voltage range of 12 V to 17 V and supports switching frequencies from 6 kHz to 220 kHz. The device features an internal oscillator, a high-bandwidth transconductance error amplifier, and a precision multiplier for sinusoidal line-current shaping. It includes built-in protection mechanisms such as undervoltage lockout, overvoltage clamp, and cycle-by-cycle current limiting. Packaged in a 16-pin SOIC (DW) format, it functions within an ambient temperature range of 0°C to 70°C.

Feature Summary

• Implements average current mode control for precise input current shaping
• Integrates a high-bandwidth transconductance error amplifier
• Includes comprehensive protection against overvoltage and current faults

Applications

• Active power factor correction stages in AC-DC converters
• Compliance with IEC 61000-3-2 harmonic emission standards
• Universal input offline power supplies

Procurement Notes

Verify the specific suffix 'DWTR' confirms the tape-and-reel packaging variant. Confirm RoHS compliance status via the official datasheet. Ensure design compatibility with the specified 16-SOIC footprint and thermal requirements.

Selection Notes

Select this component for applications requiring active PFC with average current mode control. Verify that the required operating frequency falls within the 6 kHz to 220 kHz range. Ensure the system design accommodates the 16-pin surface-mount package constraints.

Part Context

This part belongs to the UCC3817/18 family of power factor correction controllers. It serves as a functional alternative to legacy UC3854-based designs, offering improved performance through average current mode control rather than peak current mode techniques.

Replacement Considerations

The UCC3818DWTR is a documented pin-compatible alternative within the same product family.