Re: Running a microcontroller in car - power supply aspects
Remember my EE mantra I keep preaching- "the fuse always comes first" - not after a bunch of stuff. You don't want the fuse after the 5V SMPS- if it has failed and the zener clamps, the SMPS will smoke and then what fuse is there? the 30A one?
I still like the series reverse-diode because the car cannot discharge the 680uF cap.
A 5.6V 5W 1N5339B zener clamps near 6V anyhow, I don't know if a ATmega328 would survive. I would not bother with the ZD7 protection on the 5V, if the 5V SMPS is dead then everything is dead.
Remember my EE mantra I keep preaching- "the fuse always comes first" - not after a bunch of stuff. You don't want the fuse after the 5V SMPS- if it has failed and the zener clamps, the SMPS will smoke and then what fuse is there? the 30A one?
I still like the series reverse-diode because the car cannot discharge the 680uF cap.
A 5.6V 5W 1N5339B zener clamps near 6V anyhow, I don't know if a ATmega328 would survive. I would not bother with the ZD7 protection on the 5V, if the 5V SMPS is dead then everything is dead.
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