![]() ![]() System just trashed my longer answer :-(. ![]() The chosen MOSFET is very marginal in this application.įar far far better MOSFETs available ex stock at Digikey include:įor 26c/10 Digikey IRLML6346 SOT23 pkg, 30V, 3.4A, 0.06 Ohm, Vgsth = 1.1V = gate threshold Voltage. The 10k gate drive resistor (as shown) is large and will cause slow turn off and on and more power dissipation in the MOSFET. ![]() This stops the gate being driven destructively high by "Miller capacitance" coupling to the drain during unexpected or extreme variations in drain voltage.Ĭonnect Anode to source and Cathode to gate so that the zener does not usually conduct. Adding a gate-source zener diode of say 12V (> Vgate_drive) is a very good idea indeed in all circuits with inductive load. ![]()
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