Mike writes

>
> Is it possible that the voltage on the MOSEFT source pin was sagging
> slightly under the higher loads?  This would reduce Vgs and tend to raise
> the on resistance, especialy if you were close to the devices Vth anyway.

These are the mosfets internal to the PIC, so the source is at supply for
the p-channel and ground for the n-channel. Vsupply was 5.08 volts
continuously. Not knowing the internals of the PIC, but having a pretty
good idea, the mosfet drive is rail to rail.

> I'm guessing from the (high) resistances in the chart that these device
> are either small signal MOSFETs, or are operating near their threshold
> voltages?  Or possibly the units are milli-ohms rather than Ohms?

They are ohms. Again, the mosfets are internal, the PIC output pin itself.

-Bob



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist