ST HVLED007低失真高压LED驱动方案
ST公司的HVLED007是低失真高压LED驱动器,是电流模式PFC控制器,特别适用于工作在转换模式(aka 准谐振操作)的隔离高功率因素反激转换器,目标用在室内和户外固态照明应用,它的工作温度低到-40℃还能保证电性能指标.HVLED007的主要特性是特别电路(输入电流正形器,ICS),使得高PF准谐振反激变换器能从动力线上提供理论上正弦输入电流,这不同于传统的控制方案.在满负载输入电流总失真(THD)低于10%,而在整个输入范围内30%负载时低于20%.HVLED007的保护特性,可处理过载,短路和过压等条件.图腾极输出级能处理600mA源电流和800mA沉电流,适合于大的MOSFET驱动,和其它特性一起,使得HVLED007是极好的低成本解决方案,兼容EN61000-3-2的开关电源(SMPS),功率高达100W.主要用在家用,商用和工业照明的AC/DC LED驱动器,街灯照明,以及EN61000-3-2兼而有之的开关电源(SMPS).本文介绍了HVLED007主要特性,框图和应用电路,以及35W演示板EVLHVLED007W35F主要特性,电路图,材料清单和PCB设计图.
The HVLED007 is a current-mode PFC controllerspecific for isolated high power factor, flybackconverters operated in transition mode (akaquasi-resonant operation). Targeting both indoorand outdoor solid-state lighting applications, itprovides extended temperature range operationdown to -40℃ with guaranteed electricalspecification.
The main feature of this IC is a special circuit(Input Current Shaper, ICS), that enables High-PFquasi-resonant flyback converters to draw atheoretically sinusoidal input current from thepower line, unlike the traditional control.
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