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Comments on Variant of a Mosfet's Gate-Source protection

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Variant of a Mosfet's Gate-Source protection

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Let's say a 100V voltage spike arrives at +12V and the TVS diode clamps it to 25V. Q2 may or may not be activated. Will this circuit ensure a V_gs lower than 25V for the mosfet Q1 ? Any catch to it ?

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Add a cap (1 comment)
Add a cap
Lundinā€­ wrote over 1 year ago

I'd add a decoupling cap to the +12V line in addition to the TVS. The TVS will take the blow in case of spikes and the cap will ensure that the voltage stays otherwise stable. Something along the lines of 100nF X7R 50V will probably work ok.