I recently wanted to use a IRFZ44N N-Channel Mosfet (up to 50V) to control a 50 LED Panel with a current of 35V.
The Panel itself uses 230V AC which goes to a rectifier (?) which outputs 35V DC and powers the LEDs successfully.
I then cut the cable going to the negative terminal of the rectifier, connected the part coming from the LEDs to the Drain and the rectifier to Source.
Problems I have and things I found out:
- When I power the lamp, I can't control the state of the LEDs (LEDs always on)
- When I measure the power, all 3 Pins (Gate, Drain, Source) measure the full 35V (full output of the rectifier)
- When I tested the Mosfet with 3v pins from my Raspberry Pi, it worked so I guess the Mosfet itself is not broken. Also tested 3 of the same Mosfets all with the same results
- I added a 10kOhm resistor between the gate and the source. It didn't change anything and the LEDs stayed on
- The Mosfet itself is rated for 50V so it sould be able to handle my 35V
I am obviously missing something, but what?