I have a central board that takes inputs from the car and controls other boards using I2C. The central board has 3 power inputs:[...]In total 20A could be drawn.These are the different scenarios for power:a) Only 1) on.b) 1) and 2) on.c) 1) and 2) and 3) on.d) 1) and 3) one) Only 3) onCurrent cannot be shared between the 3 power inputs on the car side. But on the boards, when more than one is available I would like power to be shared evenly.I am guessing diodes are the right way to go. Does anyone have any suggestions as to what to use? And if so a link to one would be really helpful. The diodes at the moment will just get hot. Preferably I don't want to use a heat sink.
Can you recommend a diode that I wont need a heat sink with?