– The MOSFET approach gives you the protection of a diode, but with a much lower voltage drop. –
Destroying a project by connecting the power supply the wrong way is a nightmare. Haven’t we all been there?…
To add some extra protection to my own projects, I’ve made a small board and this guide on how to select components for it.
I am now sharing the guide for all. – It contains the following:
* Comparing Reverse Polarity Protection Methods
* How the Circuit Works
* Choosing a MOSFET from a datasheet
* Design Examples:
– 5-12 V Supply (no zener required)
– 12-24 V Supply
– 24-48 V Supply
* The Design Examples Cover:
– Step 1 – Selecting the P-Channel MOSFET
– Step 2 – Selecting the Zener Diode
– Step 3 – Calculating the Gate Resistor
– Step 4 – Checking the Resistor Power
– Step 5 – Checking the Zener Power
– Recommended Component Values
See and download the documentation here:
