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750mA CV-CC USB Charger plus 12Vdc (=/- 20%) @ 100mA CV outputs

Dears,

Is there a controler (preferible without optocoupler) to design the subjected PS?

I tried one topology, but I am having problems when the USB charger output gets shorted, once the controler protection cuts bolt outputs.

This behavoir is a problem in my design, but the inverse (all outputs be cut if a overload occurs in the 12Vdc line) is acceptable.

Tks in advance for any help.

JB