yoosefheidari
Member level 5
hi guys
i saw in many commercial modules(buck-boost-etc...) for current limit section they use an op-amp and connect it to FB pin of controller.
but why they didn't use controller;s built-in current limit op-amp?just connect two sides of shunt resistor to current sense pins and then no need to extra op-amp or other circuits and even it costs less!
is there any disadvantage of using controller's current sesnse section? or any advantage of using external op-amp and connect it to FB pin of controller(actually using voltage feedback to limit current)?
i saw in many commercial modules(buck-boost-etc...) for current limit section they use an op-amp and connect it to FB pin of controller.
but why they didn't use controller;s built-in current limit op-amp?just connect two sides of shunt resistor to current sense pins and then no need to extra op-amp or other circuits and even it costs less!
is there any disadvantage of using controller's current sesnse section? or any advantage of using external op-amp and connect it to FB pin of controller(actually using voltage feedback to limit current)?