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28th August 2006, 08:57 PM
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 Are protection diodes necessary with FETs? Is it necessary to use a protection diode when using an FET to drive a relay (as when you use a bipolar to drive a relay)??? | |
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28th August 2006, 09:41 PM
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 Yes, if you are using the drain connection to drive the minus side of a relay coil, add the dide across the relay coil. Although MOSFETs have an intrinsic body diode, they are not connected correctly for that particuar type of protection. Bob | |
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29th August 2006, 03:11 AM
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| If you mean putting a diode in parallel with the coil with reverse polarity, this is typically done to quell the flyback effect of the collapsing magnetic field, which causes a high voltage. This type of diode arrangement generally should be done regardless of the driving device.
__________________ "Everything that is done in the world is done by hope." -Martin Luther "There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."-Albert Einstein | |
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