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http://baike.baidu.com/view/9121623.htm#3
RCD电路一般用在隔离的FLYBACK, ACF, 桥式电路比较多,在BUCK中一般使用RC电路来抵制尖峰。
根据经验来调试,可先用1nF的电容,加几ohm的电阻,比如2ohm来看抑制的效果,再相应的调节电阻电容的值