precision 40mA low side current sink

coldrunning2002 on Oct 12, 2017

Hello,

I want to make a precision 40mA low side current sink that can work with 5V to 300 Volts maximum, for use in a pro audio amplifier. Any voltage up to 100V is also available to power the solution circuit.

Has to work -40 C to + 85 C

Gary

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0 TimW

on Oct 14, 2017 1:33 AM
Another option would be to use two MJE340's in a darlington pair configuration. This would increase HFE and decrease bias current errors. Alternatively, a high voltage MOSFET would also work. The amplifier you have looks fine. I'd go with an LT1027 or LT6657 for the reference.
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0 TimW

on Oct 14, 2017 1:33 AM
Another option would be to use two MJE340's in a darlington pair configuration. This would increase HFE and decrease bias current errors. Alternatively, a high voltage MOSFET would also work. The amplifier you have looks fine. I'd go with an LT1027 or LT6657 for the reference.
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