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Old 12th February 2008, 12:00 PM   #1
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Default Lm317 Soa

Hi,
normally, the LM317 series regulator is internally secured for shorted output. This works as long as the maximem Vin->Vout relation ~ 40VDC isn't violated. In my case, I have 60V in and 30V out A shorted output, even for a fraction of a second, immediatly kills the device. Is there a simple method to maintain safety when the output is shorted?
Rüdiger
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Old 12th February 2008, 03:49 PM   #2
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Look at the National Semi application note LB-47 -- (SY's favorite regulator)

http://www.national.com/an/LB/LB-47.pdf#page=1

it's protected against fault at higher voltage
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Old 12th February 2008, 04:12 PM   #3
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Thanks a lot,
that is exaclty what I was looking for!
Rüdiger
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