3842的8脚没输出电压该怎么查故障？ uc3842做的升压电路 8脚0.5v 6脚没输出 3脚没电...
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3842的8脚是为内部供外用的基准电压5V，8脚没电压输出说明3942未启动，测量一下7脚启动电压，正常在16V左右。电动车充电器3842没有电压输出，检查方法很简单，原来是它坏了
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