The way the schematic is drawn, Q1 is backwards, meaning the integral diode is feeding the load and the MOSFET has almost no control. Did you intend to have the source tied to your +12V supply ? I'm assuming yes, and you simply made a minor mistake in the drawing.
If your intent is to use the PMOS device to implement PWM on a resistive load, except when the switch is closed, you will need a 'high-side' driver that sets the gate to around +10 to +12V when the MOSFET is intended to be off. To turn the PMOS on, the gate needs to be around +8V or lower. Are you sure the ATTINY can drive those voltage levels ? In any case, I dont see any obvious hazards with the switch; the Vgs rating for the MOSFET is 20V so you wont risk exceeding that running at 12V unless you have an inductive load. BTW, this is a really high-power MOSFET so be aware of the leakage current. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/55204026-8686-48f0-86dd-83126dd6feed%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
