UC3855BDWG4

Overview

The UC3855BDWG4 is a high-performance power factor preregulator integrated circuit manufactured by Texas Instruments. It operates in an average current mode control architecture to optimize power quality. The device supports a switching frequency of up to 500 kHz, enabling compact magnetic component design. It functions within a supply voltage range of 10 V to 20 V and is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package with a wide lead pitch for reliable surface-mount assembly.

Feature Summary

• Implements average current mode control for precise input current shaping
• Integrates multiplier and error amplifier for high power factor correction
• Supports high-frequency operation up to 500 kHz for reduced passive size

Applications

• Offline power supplies requiring high power factor
• Universal AC-DC converter front ends
• Power factor correction stages in consumer electronics

Procurement Notes

Verify the specific suffix 'G4' indicates compliance with RoHS directives and lead-free manufacturing standards as per Texas Instruments documentation. Confirm the SOIC-20 package dimensions match your PCB footprint requirements. Ensure the operating temperature range aligns with your system's thermal environment specifications before finalizing procurement.

Selection Notes

Select this component when designing systems requiring active power factor correction with average current mode control. It is suitable for applications needing a switching frequency around 500 kHz to minimize inductor and transformer sizes. Consider the 20-pin SOIC package for surface-mount assembly constraints and verify that the 10 V to 20 V supply range fits your auxiliary power design.

Part Context

This part belongs to the UC385x family of power factor preregulators from Texas Instruments. These devices are designed to improve the efficiency and power quality of offline power supplies. The UC3855 variant specifically offers features tailored for universal input applications, providing robust performance in standard industrial and commercial power conversion environments.

Replacement Considerations

The UC3855BDW is the non-RoHS compliant equivalent of the UC3855BDWG4. Both share identical electrical characteristics and pinouts. Verify if the RoHS status is critical for your regulatory compliance needs when substituting between these variants.