UCC28950PW Full-bridge Controller Description

The UCC28950 enhanced phase-shifted controller expands on Texas Instruments' industry-standard UCx895 phase-shifted controller family, offering best-in-class efficiency in today's high-performance power systems. The UCC28950 implements advanced full-bridge control as well as active control of the synchronous rectifier output stage.

The primary-side signals allow for programmable delays to ensure ZVS operation over a wide load current and input voltage range, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers, maximizing overall system efficiency.

The UCC28950 also includes a burst mode and dynamic SR on/off control when transitioning into and out of Discontinuous Current Mode (DCM) operation, ensuring ZVS operation is extended down to much lighter loads.

UCC28950PW Full-bridge Controller Features

Voltage Mode Control

(±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support

Programmable Switching Frequency up to 1 MHz with Bi-Directional Synchronization

Direct Synchronous Rectifier (SR) Control

Enhanced Wide Range Resonant Zero Voltage Switching (ZVS) Capability

Average or Peak Current Mode Control

VDD Undervoltage Lockout

Closed Loop Soft Start and Enable Function

Programmable Slope Compensation

Discontinuous Conduction Mode (DCM), Dynamic SR On and Off Control with Programmable Threshold

Programmable Adaptive Delay

Burst Mode Operation

Naturally Handles Pre-Biased Start-Up With DCM Mode

150-μA Start-Up Current

Wide Temperature Range –40°C to +125°C

Full-bridge Full-bridge Controller Applications

Datacom, Telecom, and Wireless Base-Station

High-Density Power Architectures

Phase-Shifted Full-Bridge Converters

Solar Inverters, and Electric Vehicles

Power

Server, Power Supplies

Industrial Power Systems