I have a BIGTREETECH SKR 2 3D printer control board I'm trying to use to control a 24V, 100mA fan. The microcontroller has a pwm output at 3.3V that connects to a 74LVC1G125 voltage level converter. I copied a mosfet circuit already built into the board for powering 3 other fans. This circuit should take the 5V pwm output from the voltage converter to trigger an AO3400A mosfet gate, allowing 24V across the fan.
When I first plugged this circuit into the control board the fan ran for 5-10 seconds and then cut out. I cycled power to the controller, but the fan never came back on. I hooked my circuit back up to my benchtop supply and checked that my the current being drawn from the level converter (through PE6) is 50 microamps, well below the 74LVC1G125 continuous output current rating of 100mA. I have a new voltage level converter ( MC74VHC1GT125DT1) on the way, but I don't want to just plug back in and fry another one.
I'd appreciate any ideas on what might have gone wrong here.
Here's some pictures of the circuit I built for the external mosfet.
When I first plugged this circuit into the control board the fan ran for 5-10 seconds and then cut out. I cycled power to the controller, but the fan never came back on. I hooked my circuit back up to my benchtop supply and checked that my the current being drawn from the level converter (through PE6) is 50 microamps, well below the 74LVC1G125 continuous output current rating of 100mA. I have a new voltage level converter ( MC74VHC1GT125DT1) on the way, but I don't want to just plug back in and fry another one.
I'd appreciate any ideas on what might have gone wrong here.
Here's some pictures of the circuit I built for the external mosfet.