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 85% for 65-W Nominal Power DesignPeak-Power Mode for Transient OverloadShutdown Pin Interface for External NTCProtections: Overvoltage, Overcurrent, Over-Temperature, Overload Timer (UCC28630), AC Line UV, Brownout and Pin ProtectionsFrequency Dither to Ease EMI Compliance (except the UCC28632)UCC28633 应用:AC-DC Adapters for Notebook, Game Consoles, PrintersOpen Frame SMPS for Industrial, Printer, White Goods, LCD MonitorsEnergy Efficient AC-DC Supplies for Nominal Power 10-W to 65-W, (with up to 200% transient peak power) 图 1. UCC28633 框图图 2. UCC28633 19.5V/65W 适配器应用电路图24V 65W 离线反激电源参考设计24V 65W Nominal 130W Surge Offline Flyback Power Supply for Industrial Rails Reference Design24V Output, Constant Voltage / Constant Current, 65W Flyback power supply with 130W surge capability. Primary side regulation eliminates feedback opto-coupler and provides 1% regulation down to no-load. Average efficiency of 89% and no load power of 85% Efficiency at 10% load 图 3. 24V 65W 离线反激电源评估板外形图图 4. 24V 65W 离线反激电源评估板电路图(1)图 5. 24V 65W 离线反激电源评估板电路图(2)24V 65W 离线反激电源评估板材料清单:AO-Electronics 傲壹电子 官网：www.aoelectronics.com 中文网：www.aoelectronics.cnALPS ADI IR JRC/NJR KEC OTAX Seoul Semiconductor TI Walsin Technology