Author Topic: Range of voltage drop across schottky diodes...  (Read 537 times)

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Offline alank2

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Range of voltage drop across schottky diodes...
« on: March 30, 2016, 06:37:23 am »
I noticed when looking at Digikey's list of them that there are ones that drop as much as non schottky diodes.

What are they designed for?  The minimum drop for X amount of current?

What I am looking for is the minimal amount of voltage drop - I'm using them to support two power inputs and don't want either to back feed the other.  Should I look for the lowest voltage drop and at the same time for it to handle the current I need?  In this case <500mA at 5V DC.
 

Offline michaeliv

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Re: Range of voltage drop across schottky diodes...
« Reply #1 on: March 30, 2016, 07:26:59 am »
It's generally a balance of voltage drop + recovery time + reverse current + price.
So even if they have a higher voltage drop than a regular diode they will have a much lower recovery time.
Is this what you are asking .. "why do they exist?"

For your scenario you probably don't care about 1ma reverse current and a few hundrend uS of recovery time, so yes, look for lowest voltage drop.
« Last Edit: March 30, 2016, 07:29:19 am by michaeliv »
 

Offline Seekonk

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Re: Range of voltage drop across schottky diodes...
« Reply #2 on: March 30, 2016, 07:42:20 am »
A low reverse voltage generally goes with low forward voltage.  There is a big penalty going above 40V.
 


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