Current Limiter

175

03:00:35

Limit the current with mosfet

published 6 years ago

hurz

6 years ago

I have modified this circuit for a constant current of 2mA. You can increase the current by changing the upper left 1kOhm. E.g.constant current = 2V/1kOhm=2mA The output impedance can be upto 14kOhm in this configuration. The lower left resistor to ground is our output! http://everycircuit.com/circuit/5682976898416640

hurz

6 years ago

i made an update for constant 20mA its just more popular to drive an LED and not just a dead resistor. 😜

isteve

6 years ago

I'm checking my design in order to apply it on my charging circuit. The current must be limited below 1A

hurz

6 years ago

That wont work if your initial voltage is 89V tooooo much power dissipation and heat inside your circuit which is actually a linear regulator. Only on example calculation to your lower mosfet. it does drop now 88.4V at 1.2A thats a power dissipation of 106W just into heat! This you have carfully to rethink and rework. Have fun

isteve

6 years ago

Don't worry. I just check the theory. My real input is only 6V

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