I've made a fool of myself, sorry. Of course Q1 is drawn backwards. Thanks for details provided, seems like I need some homework done.
On 1 August 2016 at 18:01, gregebert <[email protected]> wrote: > 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 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 > <https://groups.google.com/d/msgid/neonixie-l/55204026-8686-48f0-86dd-83126dd6feed%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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/CAChpj6xLLcchvehmg2%3Djb9rMY2iWzXLnYVYFG0o0tF5s1GaA1w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
