Hello everyone, I am new to the forum and I don't know if I am posting this is the right place. I am facing a very interesting problem here. I already worked with MOSFETs before, but never seen something like that. I have a circuit using TL494 oscillating at ~80KHz and it works fine, I am driving the MOSFET normally, and it is a IRF9540. However, if I replace the IRF9540 for a IRFR5305, the output goes to Vcc and not the regulated output, any ideas? I am using a SB360 schottky diode with an input of 24V (the same for 48V input). Anybody have any idea why the circuit works with one MOSFET and not the other?
The original circuit is 48V and it works great with the IRF9540 but the same problem happens with the IRFR5305.
I couldn't find the model for TL494 on TINA so I just build this schematic for representation.
I tested the IRFR5305 with the multimeter and it seems to be working correctly, I have 5 of them, all new, one of them I haven't used yet in case I am doing something very wrong so I have a brand new for testing, the other four have the same problem. Sorry for the bad english.