General > General Technical Chat

Quick TVS diode question. Vclamp < Vbreakdown

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kellogs:
1n914 ?


--- Quote ---Hmm, minimum rating is -60V, you'll have to do something about that
--- End quote ---

Ok, so... if chip does not touch Vin, where is the problem ?

kellogs:
Well, I ain't hell bent on understanding what's the matter. Would be nice if I would though.

In the meanwhile, how about using the MCU for protecting the bigger load ?



Q1 = 250V N channel MOSFET
Q2 = logic level N MOSFET
D1 = standard variety 0.5 - 5 kW TVS
D2 = probably not needed, some very low value Zener

MCU has a 330 uF reservoir so it will still operate even on a negative spike; its 5V is protected separately. This ought to work, right ?

LE: actually Q1 will be two back to back MOSFETS

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