how many amps do you want to switch |
5 |
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0% |
[ 0 ] |
10 |
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0% |
[ 0 ] |
20 |
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11% |
[ 1 ] |
30 |
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11% |
[ 1 ] |
50 |
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33% |
[ 3 ] |
100 |
|
22% |
[ 2 ] |
150 |
|
0% |
[ 0 ] |
200+ |
|
22% |
[ 2 ] |
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Total Votes : 9 |
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JohnMuchow
Joined: 25 Aug 2004
Posts: 21
Location: New York City, USA
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quote:
Originally posted by Spockie-Tech:
I like this . is that like "almost unsinkable" - still, they should be less blow-upa-able than a normal Fet.
Absolutely. We short-circuited them, overheated them, and subjected them to 100V Vds (they just turn on to protect themselves) without problems. They will blow up if you keep overheating them without allowing the device to cool sufficiently or try to turn it on/off at too high a frequency. The App Notes address both of these failure modes though.
quote:
How about using the micro driver to periodically pulse the gate drive off and on again once every half second or so to reset it if the current limit triggers ?
Dropping the gate voltage won't reset it, you need to bring Vds to 0V (if I remember correctly).
quote:
Thats what I noticed. The operating voltage is a little lower than I would like (40v) which might make 36v operation a little close to the wind, but I dont see any other devices with in built limiting and a higher operating voltage out there.
You might not be able to use them with 30-cell (36V) packs as the IPS0551T turns on if the Vds exceeds 42V (with the batch we had) and a freshly charged 36V pack can exceed that. But, if 36V was your max, no problems. _________________ John Muchow, CamLight Systems
http://www.camlight.com
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Fri Aug 27, 2004 3:00 pm |
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