[H]ackerK
Newbie level 4
driving p channel mosfet
Thread started here -> (see the last few posts)
I am happy to report, the IRF9520 can drive 48 LEDs and not a problem at all. (no heat sink required)
However now, I think it is all my crappy brick powersupply, which is junk. All 3 of them I have tried say 5V 2A, 2.5A, 3A... Yea right! When I have all RGB on, voltage dropped to 3.4V!! And to my surprise the current is only about 340mA!
I think I need a "REAL" powersupply can can do steady 5V. Maybe I will hook up to my PC powersupply and do some test.
Now my question is how much voltage drop am I suppose to expect from the MOSFET?
When I did my simple test with 8 LEDs, the voltage drop from Source to Drain is less than 0.1V. So I said hey this is cool. But after I hook up 48 LEDs, the voltage drop between S & D seems to be larger, if I recall it was about 0.3-0.4V.. Is this normal?
BTW the MOSFET is not even warm. Which I guess that's good.
Thread started here -> (see the last few posts)
I am happy to report, the IRF9520 can drive 48 LEDs and not a problem at all. (no heat sink required)
However now, I think it is all my crappy brick powersupply, which is junk. All 3 of them I have tried say 5V 2A, 2.5A, 3A... Yea right! When I have all RGB on, voltage dropped to 3.4V!! And to my surprise the current is only about 340mA!
I think I need a "REAL" powersupply can can do steady 5V. Maybe I will hook up to my PC powersupply and do some test.
Now my question is how much voltage drop am I suppose to expect from the MOSFET?
When I did my simple test with 8 LEDs, the voltage drop from Source to Drain is less than 0.1V. So I said hey this is cool. But after I hook up 48 LEDs, the voltage drop between S & D seems to be larger, if I recall it was about 0.3-0.4V.. Is this normal?
BTW the MOSFET is not even warm. Which I guess that's good.