UC3854DW

Overview

The UC3854DW is a high-power-factor preregulator controller manufactured by Texas Instruments, designed for power factor correction applications. It operates within a supply voltage range of 10 V to 20 V and supports switching frequencies up to 200 kHz. The device utilizes current-mode control with pulse width modulation to achieve sinusoidal input currents. It is housed in a 16-pin SOIC package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Implements current-mode control architecture for precise regulation
• Integrates zero-power detection capability for efficiency optimization
• Features internal soft-start circuitry to manage inrush currents

Applications

• Power factor correction pre-regulators
• High-performance AC-DC power supplies
• Universal input offline power converters

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature grade. Ensure compatibility with moisture sensitivity levels during storage and handling. Confirm RoHS compliance status through manufacturer datasheets before integration into regulated assemblies.

Selection Notes

Select this component for designs requiring active power factor correction with moderate power levels. Evaluate thermal management requirements due to the surface-mount package. Compare against PDIP variants if through-hole mounting is mandatory for mechanical stability or legacy board layouts.

Part Context

This part belongs to the UC3854 family of power factor correction controllers from Texas Instruments. It serves as a specialized integrated circuit for managing boost converter topologies in AC-DC conversion stages, ensuring compliance with harmonic distortion standards.

Replacement Considerations

UC3854BDW and UC3854ADW are documented variants within the same family offering similar functionality with potential differences in temperature ranges or manufacturing lots.