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Paul Illegems
Paul Illegems
11/20/2013 11:58:06 AM
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Newbie
Re: Protection diodes
Thanks Jayaraman. You are right about needing a diode. The best would be to have a Schottky diode, but these are usually not available in the standard CMOS processes that I'm talking about. (At least not the kind that can handle amps of current). If the source and bulk of the switch are tied together you will see the bulk diode across the switch and forward current will flow through it. However, there are at least two problems with the bulk diode. First, this (large) current is pulled from the substrate, creating a large risk for latchup. Second, the reverse recovery time of the body diode is long. An isolated or external Schottky diode takes care of both these issues and reduces the loss thanks to the lower forward voltage.

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JAYARAMAN KIRUTHI VASAN
JAYARAMAN KIRUTHI VASAN
11/19/2013 3:03:21 AM
User Rank
Master
Protection diodes
Paul,

Interesting post. In power switches, if a inductive load is present, a protective diode is placed across the MOSFET, if I am right. Is it built-in inside the power switch IC as part of the design?

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