光耦接收級開路IC1-2腳為5V?為什么是5V,IC內(nèi)部基準電壓沒找到,而且基準到COMP腳還接個電阻,也不知道為多大的?
光耦短路,Vcomp腳為0V,mos也截止吧.因為這個IC有個ON/OFF控制模式.COMP腳電壓低于1.2V的時候,也會關斷吧.
The LD7535 can be turned off by pulling COMP pin lower
than 1.2V. The gate output pin of the LD7535 will be
disabled immediately under such condition. The off-mode
can be released when the pull-low signal is removed.