I need to match some mosfets for a project I am building (Aleph 5). Nelson Pass describes the mosfet matching procedure in his A75 article. It seems simple enough but I just want to make sure before I test the mosfets.
For the N channel the + voltage goes through R1 to the drain pin, which is tied to the gate. The Source connects to ground. Vgs is taken across ground and the drain.
For the P channel, the + voltage goes through R1 to the Source pin. The drain pin is tied to the gate and goes to ground. Vgs is taken across ground and the Source pin.
Using a 24 volt supply.
I = (V-4) / R1
For the IRFP240, Nelson states that the current draw is just over 2 amps for the Aleph 5. So for a 24v supply you divide 20 by .666 (2amps / 3 devices) to get 30 ohms.
For the 9610, the current draw is 20 mA.
R1 = 20 / 0.02 which gives 1k ohm.
Is this correct ?
Thanks
gc
For the N channel the + voltage goes through R1 to the drain pin, which is tied to the gate. The Source connects to ground. Vgs is taken across ground and the drain.
For the P channel, the + voltage goes through R1 to the Source pin. The drain pin is tied to the gate and goes to ground. Vgs is taken across ground and the Source pin.
Using a 24 volt supply.
I = (V-4) / R1
For the IRFP240, Nelson states that the current draw is just over 2 amps for the Aleph 5. So for a 24v supply you divide 20 by .666 (2amps / 3 devices) to get 30 ohms.
For the 9610, the current draw is 20 mA.
R1 = 20 / 0.02 which gives 1k ohm.
Is this correct ?
Thanks
gc