TI UCC28250PWR

The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target 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 drivers used in conjunction with the UCC28250 provide a complete power converter solution. Externally programmable soft - start, used in conjunction with an internal prebiased start - up circuit, allows the controller to gradually reach a steady - state operating point under all output conditions. The UCC28250 can be configured for primary or secondary - side control and either voltage or current mode control can be implemented. The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle - by - cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary - side switch and secondary - side synchronous rectifiers can be independently programmed.

• 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

• Half - Bridge, Full - Bridge, Interleaved Forward, and Push - Pull Isolated Converters
• Telecom and Data - com Power
• Wireless Base Station Power
• Server Power
• Industrial Power Systems