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Schottky diode

jacksel

Well Known Member
Has anyone used a Schottky diode to protect your back up battery?

I have destroyed 2 due to overheating.

I don't understand. They are rated for 30 VDC, 65 amps. Normal bus current is 15 amps.

I'm going to try fitting a heat sink.

Jacksel
 
Anything over an amp or so requires a heat sink. That can be something as simple as a screw through the case to a bulkhead or such (if you have a diode with an insulated case).

Assuming you want two lines into the diode and one line out to your backup battery, this works:
https://www.alliedelec.com/m/d/adb576f761016d9384dabbbecf0dd516.pdf

If you only want one line in and one line out, then put the two in terminals in parallel.

I found crimping a wire to a D connector pin, tinning the diode pins, then lightly soldering the D connector pin to the diode package is a great way to wire these up. I put a piece of shrink tubing over the pins.

Don’t forget to use heat sink grease between the package and whatever you are using for a heat sink.

Carl
 
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