LM3421 GATE pin needs protection diode

treez

Other Parts Discussed in Thread: LM3421

Do we need to add a schottky protection diode to the gate pin of LM3421?

On page 10 of the LT1243 datasheet it says that such a diode is needed for that IC. Is this also the case for the LM3421?

LT1243 datasheet

http://cds.linear.com/docs/en/datasheet/1241fa.pdf

over 11 years ago

0 Victor Chen_HK over 11 years ago

TI__Expert 5130 points

It is not necessary to add a diode. You may notice that the internal circuits of the gate pin are different for these devices. Just follow the LM3421 design guide if you are doing a constant current controller.

0 treez over 11 years ago in reply to Victor Chen_HK

Intellectual 970 points

But nowhere in the LM3421 datasheet (or anywhere else) does it say that the LM3421 doesn't use a bipolar output. So how do you be sure of what you say?

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LM3421 GATE pin needs protection diode