I am trying to toggle the power on a 24V LED strip using a IRFZ44N MOSFET. I am able to power the LED strip and vary the current using different PWM duty cycles, but the MOSFET gets really hot, especially when the lights are "dimmed", i.e.
0 < duty-cycle < 100. With
duty-cycle = 0 there are no heating issues though.
The LED strip is rather power consuming, 24W/m, and I'm utilizing 4m so i figured a 4A power supply would suffice. The idea is to toggle the voltage, ~10V, on the T3 MOSFET gate by regulating the current at the base of T1 and T2. To my help is a Raspberry Pi 4B, using 3.3V GPIO, the 12V input is 1A
I am not an EE and apologize if there is anything unclear about the above schematic, would be happy to elaborate.
I found a similar post here on SE, which made me suspect the PWM frequency and T3 input voltage: I've tried many different PWM frequencies, from 1Hz to 10KHz, and also measured the voltage on the T3 gate, which according to my multi-meter is around 12v, 10V+ should be enough from what i understand. I didn't quite get the points they made about capacitance, but i have tried to lower the resistance on R4, which seems to delay the heating issue, but not fix it.