That makes sense, unfortunetly in one case I need a nice sized power mosfet to switch up to 10amps worth of led strips, and preferably id like to not use a heatsink and so keep the total heat dissapation<1W, but calculating that had seemed daunting so far, I get different results sometimes with formulas I found that I think are right, but really unsure

I have some stp40nf12 mosfets id like to use, but id rather buy a more expensive mosfet than add a driver, also my pwm freq. is 15khz, which I could lower but id rather not to completelly reduce the flicker effect(which I hate alot)

But I have some other projects at different voltages,currents,frequencys so id like to get this all down and learn it

So for the stp40nf12

Ciss=1880pf

Crss=110pf

vgs=4v max

rds(on)= .032 max

Qg= 80 nC

And well say load of 6 amps, so I know I alrready hit my 1W heat just from static resistance assuming 100% duty cycle but anyway ill carry on just to figure it out

Now for that formula before

80/(1/130)=10.4us switchin time

So .17*13v*6a*10.4us= 137.904 ? uC?

137.904*15000*2= 4137120?? What does this mean, it seems quite large, even if I cut down the switchin time dramatically this seems way too high unless its really a small unit

I tried figuring out a formula from a pdf online and using 10amp load and I get something less than 1W, but it only used crss,voltage,load and gate current so idk if its even right for what im doing or if my math is even right