I have a the situation a Mosfet switching a 12V / 15 Ohm solenoid valve. I run the switching circuits in SPICE ,I take the Ids and the Vds time the PWM duty cycle to get the Power ,interesting to see that people suggest to take the 1/2 to get the average ,
my question here is
what value of duty cycle should I use for my calculation to see the heat dissipation as it could range between 5%-95% at the moment I take a dc of 80%
in my case I have Vds = 12V,, Ids = 820mA
the Pq = ((12 V * 820mA )* 0.8) = 7.87 then Pavg = 7.87/2 =3.98W
(1)My confusion is this the Power that generates the heat over the Mosfet ?
(2) should I calculate for the loss at maximum Duty cycle ?
(3) what is the loss when there is no switching for example the Mosfet switch on and then the DC is 100% Mosfet is on all the time,
Any idea help and guidelines is highly appreciated
Kind Regards
QMESAR
my question here is
what value of duty cycle should I use for my calculation to see the heat dissipation as it could range between 5%-95% at the moment I take a dc of 80%
in my case I have Vds = 12V,, Ids = 820mA
the Pq = ((12 V * 820mA )* 0.8) = 7.87 then Pavg = 7.87/2 =3.98W
(1)My confusion is this the Power that generates the heat over the Mosfet ?
(2) should I calculate for the loss at maximum Duty cycle ?
(3) what is the loss when there is no switching for example the Mosfet switch on and then the DC is 100% Mosfet is on all the time,
Any idea help and guidelines is highly appreciated
Kind Regards
QMESAR
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