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I have the below MOSFET circuit:

enter image description here

Zener diode - Datasheet

N-channel MOSFET - Datasheet

I want to understand what is the purpose of the Zener diode D5202 and at what conditions does the Zener diode come into action?

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  • \$\begingroup\$ It appears to be a do-nothing-other-than-get-hot circuit and the power rails are undefined on the drain so, there's nothing much to add. There is every chance that this circuit doesn't actually do anything useful. \$\endgroup\$ – Andy aka Jul 4 at 10:44
  • \$\begingroup\$ Suppose the 9-16V rail goes negative at different times? At that time, does it help? \$\endgroup\$ – Newbie Jul 4 at 10:46
  • \$\begingroup\$ I can't see the purpose of analysing this circuit because it isn't self-evident what it does. The zener is to protect the gate from getting too much voltage BTW (if the supply voltages were appropriate). \$\endgroup\$ – Andy aka Jul 4 at 10:48
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I want to understand what is the purpose of the Zener diode D5202 and at what conditions does the Zener diode come into action?

If this were your circuit: -

enter image description here

Then you could say with a certain amount of authority that the zener diode prevents the gate-source from being over-driven by an excessive voltage fed in to the right side of the 10 kohm resistor. It's quite common practice to do this.

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