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LM317 HV PSU
LM317 HV PSU
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Old 5th December 2017, 08:03 PM   #11
Elvee is offline Elvee  Belgium
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I your mind is not definitely set on using a 317, here is a discrete alternative.
It might be a bit more complex, but certainly not more expensive and offers similar performances.
The main advantage is a vastly improved ruggedness in real life situations, but it is also more frugal, wastes less dropout voltage and offers a higher level of flexibility.
Simple HV series regulators
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Old 5th December 2017, 09:58 PM   #12
mchambin is offline mchambin  France
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Quote:
Originally Posted by scottjoplin View Post
You are right but the problem is that at power up the output capacitor appears as a near short to 0V
Si ą zener is a must across Vin and Vout.
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Old 6th December 2017, 01:20 AM   #13
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by scottjoplin View Post
You are right but the problem is that at power up the output capacitor appears as a near short to 0V
Yeah, I've always thought that adding a 40 volt Zener across the in & out terminals of the 317/337 would be a good idea. I've not blown up a 317 without it, but it sure has happened to me with LT1083s.
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Old 6th December 2017, 02:25 AM   #14
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by Kay Pirinha View Post
High current - yes, with the drawbacks that the power devices' emitter balancing resistors are missing and that there's no overload protection at all.
Well, the emitter resistors aren't really needed if you beta-match the pass- transistors.
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