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The below is a reverse polarity circuit with additional components around it. I would like to understand the exact functionality of the additional circuitry in dotted lines.

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Math Keeps Me Busy
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Ravi Prasad
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    Ravi Prasad - Hi, Re: "I came across the following reverse polarity circuit" Where did you come across it? To comply with the site rule on referencing, you should include a suitable citation for material copied or adapted and posted on Stack Exchange. For an online source, adding the webpage / PDF / video title & its link are the minimum; see the rule above for more details. Please [edit] your question to add a suitable reference. || Please see the [tour] & [help] as the site rules differ from typical forums. TY – SamGibson Jan 08 '24 at 11:44
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    Please double-check your source. It looks like Q2 should be PNP rather than NPN. As an NPN, there is no source for its base current. But as a PNP (emitter connected to Vout), it would actively clamp the gate of M1 in the off state as soon as Q1 turns on as a result of Vin becoming less than Vout. – Dave Tweed Jan 08 '24 at 12:42
  • Hi Dave, BC846BPN chip contains npn pnp transistors. Connections are same exactly shown circuit. – Ravi Prasad Jan 11 '24 at 15:32
  • I understand that, but it still doesn't make sense to use a NPN in that position. – Dave Tweed Jan 12 '24 at 12:44

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