UCC28951QPWRQ1 Texas Instruments MCU

UCC28951QPWRQ1 Overview

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Description

The UCC28951-Q1 device is a new enhanced version of the UCC28950-Q1; it is a fullycompatible drop-in replacement for the UCC28950-Q1. Reference application noteMaking the Correct Choice: UCC28950-Q1or UCC28951-Q1 (SLUA853) for choosing the controller to best fit yourapplication. The UCC28951-Q1 implements advanced control of the full-bridge along with activecontrol of the synchronous 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 SRs, maximizing overallsystem efficiency.

The UCC28951-Q1 offers multiple light-load management features including burst mode anddynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM)operation.

In addition, the UCC28951-Q1 includes support for current or voltage mode control.Programmable switching frequency up to 1 MHz and a wide set of protection features includingcycle-by-cycle current limit, UVLO, and thermal shutdown.

The UCC28951-Q1 is available in 24-pin TSSOP package and is RoHS compliant.

Features

Qualified for Automotive Applications
AEC-Q100 Qualified Withthe Following Results:
- Device Temperature Grade 1: –40oC to +125oC AmbientOperating Temperature Range
- Device HBM ESD Classification LevelH2
- Device CDM ESD Classification LevelC3B
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