UC3855ANG4

Overview

The UC3855ANG4 is a high-performance power factor correction (PFC) preregulator manufactured by Texas Instruments. It operates within a switching frequency range of 500 kHz and supports through-hole installation in a PDIP-20 package. The device functions with a supply voltage between 10 V and 20 V, maintaining an operating temperature range from 0°C to +70°C. Designed for average current mode control, it integrates essential features for efficient power conversion applications.

Feature Summary

• Implements average current mode control for precise power factor correction
• Supports high-frequency operation up to 500 kHz for compact magnetics
• Integrates protection mechanisms including overvoltage lockout

Applications

• High performance power factor preregulators
• Universal input AC-DC power supplies
• Offline switch-mode power supplies

Procurement Notes

Verify the component status as the UC3855ANG4 may be subject to discontinuation or end-of-life notifications. Confirm availability through authorized distributors and check for official replacement recommendations such as newer generation PFC controllers. Ensure the PDIP-20 package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component for designs requiring high-efficiency power factor correction with through-hole mounting constraints. The 500 kHz switching frequency allows for smaller passive components compared to lower frequency alternatives. Ensure the input voltage range aligns with the 10 V to 20 V operational limits during startup and normal operation phases.

Part Context

This part belongs to the UC3855B series of power factor correction controllers. It is designed to replace older discrete solutions or less integrated PFC chips. The 'G4' suffix indicates lead-free and RoHS compliance, adhering to environmental standards for electronic components produced by Texas Instruments.

Replacement Considerations

Check for official manufacturer-recommended replacements due to potential discontinuation. Verify pin compatibility and control loop stability when substituting with newer PFC controllers.