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| Created | May 21, 2012 |
| Last modified | May 21, 2012 |
| Tags | constant-current-source |
Not provided.
This one is copied from Art of Electronics. But the simulations dont show this to be constant current at all. I run a DC sweep with R5(Load) = 0 to 100 the current regulation fails for anything over 5ohm load.
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Looks like you do not have enough V1 to ram 1 amp of current through a 100 ohm load. That would give you 100 volts. You only have about 4.3 volts to work with. ( 9 volts - 4.5 volts across R_sense - 0.2 volts Q1 Vsat ). As R_load goes over 4.5 V or so, Q1 will saturate full on, and no longer function as a current source. |
May 21, 2012 |
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Whoops. Typo. "As R_load goes over 4.5 V or so, Q1 will saturate full on, and no longer function as a current source." Whoops.. 4.3 OHMS, |
May 21, 2012 |
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You might like to have a look at: and: :) |
May 22, 2012 |
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