Hello,
I use this circuit to limit supercap charging current.There are 10 supercaps(each one is 300F 2.7V) in series.
According to this circuit, the maximum current that capacitors draw is about 1.3A.
Although I use a cooler, p channel mosfet(Q6) is getting very hot.(160C) because it is in active region.
To solve this problem I've reduced the value of R3.
I thought that if the mosfet approaches the saturation zone, it will heat up less.
But the liimitted current did not changed so overheating problem continues.
I use this circuit to limit supercap charging current.There are 10 supercaps(each one is 300F 2.7V) in series.
According to this circuit, the maximum current that capacitors draw is about 1.3A.
Although I use a cooler, p channel mosfet(Q6) is getting very hot.(160C) because it is in active region.
To solve this problem I've reduced the value of R3.
I thought that if the mosfet approaches the saturation zone, it will heat up less.
But the liimitted current did not changed so overheating problem continues.