yes, a resistor will do just fine.philpoole said:I use a resistance to limit the current before the TL431. I think I use about 100R. Seems to work okay.
Is that what you mean?
Alternatively, set up the LM317 as a current source to replace both the pre-regulator and the resistor.
Actually it appears, really quite good: and if you cascode two, they perform superbly well. See for yourself in Walt Jung's two 'Sources 101' papers on current-sources here:Is the 317 a good current source?
http://waltjung.org/Late_Articles.html
As usual, excellent reading!
ask to calculate r Value
Hallo.
i want to ask anyone whose know
how to calculate R
(R1,R2,R3 /R1A,R2A,R2B) value of combination Reg LM317/337 and TL 341
i plant to use for reg +15 -15 output current 300Ma.
input volate +- 20V dc
output 15V
output current 300Ma
this the schematic.
please heelp anyone.
thx
Hallo.
i want to ask anyone whose know
how to calculate R
(R1,R2,R3 /R1A,R2A,R2B) value of combination Reg LM317/337 and TL 341
i plant to use for reg +15 -15 output current 300Ma.
input volate +- 20V dc
output 15V
output current 300Ma
this the schematic.
please heelp anyone.
thx
Attachments
Re: ask to calculate r Value
first download the datasheets for the 317 and 431.
Set the 317 (CCS) to ~= Iload + Ishunt.
Then calculate according to the datasheets.
Hi,ridwans said:
how to calculate R
(R1,R2,R3 /R1A,R2A,R2B) value of combination Reg LM317/337 and TL 341
first download the datasheets for the 317 and 431.
Set the 317 (CCS) to ~= Iload + Ishunt.
Then calculate according to the datasheets.
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