TI UCC28633 24V 65W离线反激电源参考设计.docxVIP

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TI UCC28633 24V 65W离线反激电源参考设计.docx

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TIUCC2863324V65W离线反激电源参考设计TIUCC2863324V65W离线反激电源参考设计

TI UCC28633 24V 65W离线反激电源参考设计时间：2015-01-05 09:46:13?????? 作者：TI?????? 来源：中电网TI公司的UCC28633是具有初级侧稳压功能和峰值功率模式的高功率反激控制器,内置700V起动电流源,其功能强大的栅极驱动器能工作在CCM和DCM模式,使它适合用在各种功率的电源.峰值电源模式能使瞬态峰值功率高达正常功率的200%,而峰值电流仅增加25%.主要用在笔记本,游戏控制台和打印机的AC/DC适配器,开架SMPS,10W-65W高效AC/DC电源.本文介绍了UCC28633主要特性,框图, 19.5V/65W适配器应用电路图以及24V 65W离线反激电源参考设计主要特性,电路图和材料清单.The UCC2863x targets high-power, primary-side regulated flyback converters. The powerful gate driver and ability to operate in both CCM and DCM make the device suitable for applications with a wide power range. The peak power mode allows transient peak power delivery up to 200% of nominal rating, with only a 25% peak current increase, maximizing transformer utilization.?The transformer bias winding is used to sense output voltage for regulation, and for low-loss input voltage sensing. Advanced sampling and processing techniques allow CCM operation, and deliver excellent output voltage regulation performance for opto-coupler-less designs at power levels of 100 W and above.A high-voltage current source enables fast and efficient start-up. Advanced light-load modes are deployed (including switching frequency modulation and device sleep modes) to reduce both controller and system power consumption at no load and light load. These modes enable potential system designs to meet 30-mW no-load power for power designs up to 30 W nominal, 60 W peak.The device has been designed for ease-of-use and incorporates many features to enable a wide range of designs. Extensive protection features are included to simplify system design.UCC28633主要特性:High-Power, Primary-Side Regulation for Output Voltage and Current, No Opto-Coupler RequiredContinuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) OperationBuilt-In 700-V Start-Up Current Source?Active X-Capacitor Discharge Function (UCC28630 and UCC28633)Adjustable Constant-Current (CC) Mode Limiting (except for UCC28630)High Gate Drive Current 1-A Source and 2-A SinkLow Power Modes for 30-mW System Sta