ST EVL6564－50WFLB 90－265 VAC电压50W电源解决方案
ST公司的EVL6564-50WFLB是采用L6564的输入电压90-265 VAC的50W PFC电源,适用于需要高PF的所有低功耗应用如照明,LED电源等,线路频率47-63Hz,开关频率大于44kHz,输出电压24V,负载大于50%时的功率系数大于0.9,满负载的效率大于88%.本文介绍了L6564主要特性,方框图,采用L6564的演示板EVL6564-100W电路图以及 50W的EVL6564-50WFLB评估板电路图和材料清单.
The L6564 is a current-mode PFC controller operating in transition mode (TM) and represents the compact version of L6563S as it embeds the same driver, reference and control stages in a very compact 10 pin SO package.
The highly linear multiplier, along with a special correction circuit that reduces crossover distortion of the mains current, allows wide-range-mains operation with an extremely low THD even over a large load range.
The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% @TJ = 25 °C) internal voltage reference. The loop stability is optimized by the voltae feedforward function (1/V2 correction), which in this IC uses a proprietary technique that considerably improves line transient response as well in case of mains both drops and surges (“bidirectional”).
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