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LM5008电源启动问题

Other Parts Discussed in Thread: LM5008

设计LM5008电路时遇到一个问题,80V输入,12V输出,输出电容是47uF,负载端是带使能的,电压低于5V就全部关断

1. 断开输入然后马上又接上(时间在200ms级别),输出只有2.3V了

2. 在负载端并联2K电阻就没有这个问题了

由此推断,断开输入的时候,负载电容电压往下降,当降到5V的时候,负载全部关闭了,电容电荷维持,然后把输入接上,就不能输出12V了