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The 1N5817 is rated at 20V. A single one won't work with an 18V system.......................
18 + 18 = 36, so the 5819 should still work. You might try using two in series to obtain a higher reverse breakdown voltage.
The 1N5817 is rated at 20V. A single one won't work with an 18V system.
...If you're driving a 12 coil to ground, you're going to see a minimum of 24V across that diode..
Agreed. The nature of inductors is that they try to maintain the current that is flowing when they are switched off. That current then flows in the freewheel diode at switch-off, albeit for a short time until it decays. But beefy diodes can withstand short-duration overloads. If it melts then it wasn't beefy enoughI was under the assumption that your flyback diode should also be of around the same current/power rating (or more) as the inductive load you're driving.
Yes. It was late and I didn't notice that you suggested a 1N5819, not the original 1N5817.He's already figured that out, see the first post! And then see my first post (post #2) where I tell him that exact same thing, 'cept @ 12V.
If it melts then it wasn't beefy enough
In the OP's application, I also would have used a Si rectifier like a 1N400X. They are quite robust. The 1N58XX Schottkys seem to be less robust...
...The nature of inductors is that they try to maintain the current that is flowing when they are switched off. That current then flows in the freewheel diode at switch-off, albeit for a short time until it decays...