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I'm thinking about making a reverse polarity protection for a buck converter AOZ1284, and I've found this article design-guide-pmos-mosfet-for-reverse-voltage-polarity-protection

I didn't find the spice model for AOZ1284 to simulate the full circuit.

My question : Can I use this circuit with the buck converter (I am working with 12V as input)

AOZ1284 DataSheet

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  • \$\begingroup\$ what is the buck converter output voltage? \$\endgroup\$ – jsotola Sep 21 '20 at 22:15
  • \$\begingroup\$ @jsotola the output voltage is 5V/4A \$\endgroup\$ – walid24 Sep 21 '20 at 22:19
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    \$\begingroup\$ what happens if you use only a series diode? \$\endgroup\$ – jsotola Sep 22 '20 at 1:20
  • \$\begingroup\$ @jsotola The series diode protection has a disadvantage, especially at low input voltages, due to the voltage drop across the diode. Depending on the choice of diode, a forward voltage drop of 0.2V to 0.7V can be expected, with an associated power loss = VF × IIN, which reduces both the conversion efficiency and the usable input voltage range. If the input current is 1A, then a standard power diode with VF = 0.5V dissipates 0.5W, equal to about a quarter of the dissipated power of a typical 15W converter, thus reducing the overall efficiency by 20%. \$\endgroup\$ – walid24 Sep 22 '20 at 13:42

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