I am recreating an old PCB that has long gone past its usable life. It has many MOSFETs on it. From over the years it looks like some of them have got hot enough to change the color of the PCB surrounding them. Years of use and Load, heat dissipation, thin PCB. Appear to all be factors.
I read somewhere, possibly the datasheet of the regulator used in the popular buck converters. The very popular 2596 (LM2596?), is able to regulate voltage with little to no heat dissipation.. I was wondering if anything similar has happened with MOSFETs?
This board uses a P Channel, "RKB" SOT223 package. I can't seem to find that particular marking but it appears to be a general purpose 3Amp MOSFET.
The fets drive 12v incandescent lamps, maybe up to 2. Just to get an idea of the load.
I do not know the wattage... guessing 3 watts? It is the type of bulb you would find in old school car turning signals.
Anyway, as I remake this, was just wondering if anyone knew of newer, better performing general purpose P channel FETs in a SOT223 package.
ALSO, will making the PCB thicker help with the heat?