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'[EE] PFET-based current limit circuit?'
Hello all, I'm looking for a simple-as-possible current limit circuit,
to be used for both inrush control as well as short-circuit-protect in a
battery-based power supply. What I'd like is something along the lines of:
0.1R current sense resistor
opamp or some other circuitry that controls the gate on the PFET to keep
the voltage drop across the current sense resistor at some adjustable
maximum, i.e., the max current through the PFET.
it sure seems like such a useful little circuit would exist ... I
haven't found it, and analog is not my forte, I suppose I could design
this little thing but I'd rather use something already proven.
Maybe I'm missing something here?
A 500mA max current @ 5V would be fine, and the PFET would not be
throttling (500mA * 5V = 2.5W) continuously. For the inrush control
case, it would be a second at the most, and for short-circuit-protect
there would be additional circuitry that detects the situation and shuts
Any advice appreciated!
Alan B. Pearce
>Hello all, I'm looking for a simple-as-possible current
>limit circuit, to be used for both inrush control as
>well as short-circuit-protect in a battery-based power
>supply. What I'd like is something along the lines of:
>0.1R current sense resistor
For the rest of it use an LT6100 or LTC6101 (note that one is "LT" and the
other "LTC") to sense the voltage across the resistor.
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