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Home > Embedded ICs > Embedded - Microcontroller Unit (MCU) > UCC28951PWT
Texas Instruments

UCC28951PWT

UCC28951PWT

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UCC28951PWT Overview

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Description

The UCC28951 device is an enhanced version of theUCC28950. It is a fullycompatible drop-in replacement for the UCC28950. Refer to application note SLUA853 to determine which controller to use. The UCC28951 uses advanced control of the full-bridge in addition to active control of thesynchronous rectifier (SR) output stage.

Programmable delays ensure ZVS operation over a wide range of operating conditions, whilethe load current naturally tunes the switching delays of the secondary-side synchronousrectifiers(SR). This functionality maximizes overall system efficiency.

The UCC28951 has many light-load management features includingburst-mode operation and dynamic SR ON and OFF control during transition into and out ofdiscontinuous current mode (DCM) operation. The device operates in current-mode or voltage-modecontrol. The switching frequency can be programmed up to 1 MHz. The device has protection featuresincluding cycle-by-cycle current limit, UVLO, and thermal shutdown.

The 24-pin, TSSOP package complies with RoHS requirements .

Features

  • Enhanced Zero-Voltage Switching (ZVS)Range
  • Direct Synchronous Rectifier (SR) Control
  • Light-LoadEfficiency Management Including:
    • Burst ModeOperation
    • Discontinuous Conduction Mode (DCM), Dynamic SR On/Off Control WithProgrammable Threshold
    • Programmable AdaptiveDelay
  • Average- or Peak-Current Mode Control WithProgrammable Slope Compensation and Voltage-Mode Control
  • Closed-Loop Soft-Startand Enable Function
  • Programmable Switching Frequency up to 1 MHz WithBidirectional Synchronization
  • (±3%) Cycle-by-Cycle Current Limit ProtectionWith Hiccup Mode Support
  • 150-μA Start-UpCurrent
  • VDD UndervoltageLockout
  • Wide Temperature Range: –40°C to +125°C

Specifications

Circuit Diagram

UCC28951PWT

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