The diode D1 on the gate pin needs to come out, that will cause problems. Not the least of which is it will reduce the gate voltage by at least 1V.
So In the link I provided, I multiplex the high side (similar to the T.S. PWM requirement and enable the LED loads by switching the low side. I used an n-channel Logic mosfet connected to the Arduino, to drive a power p-channel MOSFET to multiplex the LEDs. I had to add a pull-up resistor to 12V on the gate.hi dj,
The TS has requested a control line that he could pull low to enable the lite and when a high level turns off the lite.
The PWM is from a Arduino pin drive..
Perhaps the TS could explain why he wants this option.
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