TI UCC2871x马达驱动50W反激隔离电源参考设计
TI公司的UCC2871x系列是反激电源控制器,提供隔离输出的恒压(CV)和恒流(CC)输出稳压而不需要光耦合器.器件内部集成了700V起动开关,开关频率最大100kHz,无负载功耗小于10mW,主要用在USB兼容适配器和充电器,TV和台式电脑待机电源和白色家电源.本文介绍了UCC2871x系列主要特性和功能框图,用于马达驱动的400-690V AC输入50W反激隔离电源参考设计主要特性,简化框图,电路图和材料清单以及PCB元件布局图和设计图.
The UCC2871x family of flyback power supply controllers provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28710 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
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