UC3854BDWTR

Overview

The UC3854BDWTR is an enhanced high power factor preregulator from Texas Instruments, part of the UC3854B series. It operates as a current-mode PFC controller with a switching frequency range of 80 kHz to 120 kHz. The device functions within a supply voltage range of 10 V to 20 V and supports an operating temperature range of -40°C to +85°C. Packaged in a 16-SOIC surface-mount format, it features a typical start-up supply current of 250 µA.

Feature Summary

• Implements average current mode control for precise power factor correction
• Integrates internal multipliers and dividers for sinusoidal line current shaping
• Includes dedicated soft-start circuitry to limit inrush current during startup

Applications

• High power factor pre-regulators in AC-DC power supplies
• Universal input offline power conversion systems
• Industrial equipment requiring compliant power factor performance

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when sourcing. Confirm the extended industrial temperature range (-40°C to +85°C) matches system requirements. Ensure the 16-SOIC footprint aligns with PCB layout specifications before finalizing procurement.

Selection Notes

Select this component for designs requiring average current mode control rather than peak current mode. Verify that the 80 kHz to 120 kHz switching frequency range suits the magnetic component design. Compare against the UC3854BDW tube variant if reel packaging is not required for the assembly process.

Part Context

This part belongs to the UC3854 family of power factor correction controllers manufactured by Texas Instruments. It serves as an enhanced version of earlier models, offering improved performance characteristics for high-power applications. The device is widely used in offline power supplies to meet regulatory power factor standards.

Replacement Considerations

UC3854BDW (Tube Packaging)

FAQ

What control topology does the UC3854BDWTR utilize?

It utilizes average current mode control to shape the input current waveform.

Does the UC3854BDWTR include soft-start functionality?

Yes, the device integrates an internal soft-start circuit to manage startup transients.