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1、起机停振是否正常？停振原因是啥？
2、查询规格书，过压保护是FB引脚采集电压与Vfb+Vovp进行比较，请问Vfb从哪来的？
3、内部软起工作原理？
4、COMP引脚电压达到某个值，才会有输出PWM输出？
