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| How to choose TVS diodes to dispel flyback surges from relay coils? |
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| trobbins:
From the linked article by TE, the closest performance to an suppressed coil would be a coil with MOV, with the TVS taking slightly longer to open, as the MOV provides a soft clipping action as any voltage transient increases in magnitude, rather than a sharper clip like a zener. |
| T3sl4co1l:
MOV datasheets typically provide a plot of expected lifetime versus current or energy, with an asymptotic infinite life curve given. Relay coils store very little energy as surges go, and even a SMT chip MOV should do fine. TVS vs. MOV doesn't really mean anything: if you're depending on the higher voltage drop of the MOV, you can just choose a higher rated TVS. The TVS will give a squarer flyback voltage, giving slightly shorter discharge time for the same peak voltage. Tim |
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