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1、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
2、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 deli
3、very 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 deli
4、ver 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 b
5、oth 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
6、. 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 Ac
7、tive 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
8、 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
9、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, Constan
10、t 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： 中文网：ALPS ADI IR JRC/NJR KEC OTAX Seoul Semiconductor TI Walsin Technology
