# reverse voltage polarity protection

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

• what is the buck converter output voltage? – jsotola Sep 21 '20 at 22:15
• @jsotola the output voltage is 5V/4A – walid24 Sep 21 '20 at 22:19
• what happens if you use only a series diode? – jsotola Sep 22 '20 at 1:20
• @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%. – walid24 Sep 22 '20 at 13:42