The UCC28951-Q1 enhanced phase-shifted full bridge controller builds upon Texas Instrument’s industry standard UCx895 controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28951-Q1 implements advanced control of the full-bridge along with active control of the synchronous rectifier (SR) output stage.
●Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side SRs, maximizing overall system efficiency.
●The UCC28951-Q1 offers multiple light-load management features including burst mode and dynamic 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 including cycle-by-cycle current limit, UVLO and thermal shutdown.
●The UCC28951-Q1 is available in TSSOP-24 package and is RoHS compliant.
● Qualified for Automotive Applications
● AEC-Q100 Qualified With the Following Results:
● Device Temperature Grade 1: –40ºC to +125ºC Ambient Operating Temperature Range
● Device HBM ESD Classification Level H2
● Device CDM ESD Classification Level C3B
● Enhanced Zero-Voltage Switching (ZVS) Range
● Direct Synchronous Rectifier (SR) Control
● Light-Load Efficiency Management Including
● Burst Mode Operation
● Discontinuous Conduction Mode (DCM), Dynamic SR On/Off Control With Programmable Threshold
● Programmable Adaptive Delay
● Average- or Peak-Current Mode Control With Programmable Slope Compensation and Voltage-Mode Control
● Closed-Loop Soft-Start and Enable Function
● Programmable Switching Frequency up to 1 MHz with Bidirectional Synchronization
● (±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support
● 150-µA Start-Up Current
● VDD Undervoltage Lockout
● Wide Temperature Range, –40°C to +125°C
