使用ucc2580作为PWM发生器，原理图如图
EAIN接收比较电压，根据比较电压PWM调整占空比的输出。电路长时间静止放置后（EAIN不超过阈值，PWM不输出），当EAIN再次达到阈值后，芯片无OUT1无PWM输出了。REF，CLK都正常输出。当重新启动电路后，EAIN达到阈值后，OUT1又有输出了。
PS：测试了两块，一块正常，一块出现上述情况。
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