Reverse polarity protection

250

03:05:22

Using a N-Channel mosfet and a zener diode (to protect the mosfet)

published 8 years ago

boooooooom

8 years ago

How large currents are the mosfets capable of handling?

zanini007

8 years ago

Check the datasheet for max power dissipation and internal resistance when fully conducting, just remember to use a heatsink if you'll need him to handle over 1W...

rich11292000

8 years ago

What about the nmos' body diode? Which will allow current to flow backwards.

zanini007

8 years ago

If you're talking about the internal diode of them, you just need to use it in a way the diode will normally conduct on a normal situation and block on reverse polarity, the mosfet will turn on a few instants after this diode conducts the current flow if everything is right

hurz

8 years ago

rich11292000 was talking about the "body diode" check this http://everycircuit.com/circuit/6721096159330304

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