|Package | PIN:||PW | 20|
|Temp:||Q (-40 to 125)|
- Prebiased Start-up
- Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
- Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
- Primary or Secondary-Side Control
- 3.3-V, 1.5% Accurate Reference Output
- 1-MHz Capable Switching Frequency
- 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
- Programmable Soft-Start and Hiccup Restart Timer
- Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package
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Texas Instruments UCC28250PWR
The UCC28250 PWM controller is designed for high power density applications that may havestringent prebiased start-up requirements. The integrated synchronous rectifier control outputstarget high-efficiency and high-performance topologies such as half-bridge, full-bridge,interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET driversused in conjunction with the UCC28250 provide a complete power converter solution.
Externally programmable soft-start, used in conjunction with an internal prebiasedstart-up circuit, allows the controller to gradually reach a steady-state operating point under alloutput conditions. The UCC28250 can be configured for primary or secondary-side control and eithervoltage or current mode control can be implemented.
The oscillator operates at frequencies up to 2 MHz, and can be synchronized to anexternal clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccuptimer allow the system to stay within a safe operation range. Input voltage, output voltage andtemperature protection can be implemented. Dead time between primary-side switch and secondary-sidesynchronous rectifiers can be independently programmed.