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Andy aka
Andy aka
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So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent your circuit smokingbattery getting reverse polarized.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

Here's a link to a Q and A on this site that might help.

However, I notice that VIN also connects to pin 4 of the TP4056 so, maybe your circuit designer started off with good intentions but missed a trick later on.

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent your circuit smoking.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

Here's a link to a Q and A on this site that might help.

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent your battery getting reverse polarized.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

Here's a link to a Q and A on this site that might help.

However, I notice that VIN also connects to pin 4 of the TP4056 so, maybe your circuit designer started off with good intentions but missed a trick later on.

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Source Link
Andy aka
Andy aka
  • 473k
  • 29
  • 383
  • 839

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent youyour circuit smoking.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

Here's a link to a Q and A on this site that might help.

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent you circuit smoking.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent your circuit smoking.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.

Here's a link to a Q and A on this site that might help.

Source Link
Andy aka
Andy aka
  • 473k
  • 29
  • 383
  • 839

So my question is, what are these parts purpose?

It looks pretty much like a reverse voltage protection circuit. In other words, if the incoming supply to VIN were incorrectly connected regards polarity, the MOSFET inside your red/orange box would turn off and prevent you circuit smoking.

Here's a link to a site that explains how it works. It uses a slightly different gate bias circuit but, in essence, it does the same thing.