UC3871DW

Overview

The UC3871DW is a phase-shift resonant controller manufactured by Texas Instruments, designed for high-frequency power conversion applications. It operates within a supply voltage range of 9V to 20V and supports switching frequencies up to 300 kHz. The device features four outputs and is housed in a 20-SOIC surface-mount package. It functions as a half-bridge regulator with boost/buck capabilities, offering duty cycle control up to 50%. The component is rated for an operating temperature range of 0°C to 70°C.

Feature Summary

• Supports phase-shifted full bridge zero voltage transition topologies
• Integrates synchronous rectifier drive capability
• Includes clock synchronization functionality
• Provides frequency control, ramp compensation, and soft-start features

Applications

• Phase-shifted full bridge DC-DC converters
• High-efficiency power supplies requiring ZVS operation
• Industrial power management systems

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status and moisture sensitivity level prior to ordering. Check for recent product change notifications or end-of-life announcements from the manufacturer to ensure long-term availability and design continuity.

Selection Notes

Select this component for designs requiring precise phase-shift control in resonant topologies. Ensure the application demands a 20-SOIC package and operates within the specified voltage and temperature limits. Evaluate the need for synchronous rectification and clock synchronization features before finalizing the choice.

Part Context

This part belongs to the UC series of PWM controllers from Texas Instruments. It is specifically engineered for resonant converter architectures, distinguishing itself from standard hard-switching controllers by supporting advanced zero-voltage switching techniques for improved efficiency.

Replacement Considerations

Consult official substitution guides for verified alternatives. Cross-reference pinouts and electrical specifications carefully when considering equivalent components from other manufacturers.