Re: simple 150uA constant current supply
- From: Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 30 Mar 2008 14:07:14 -0700
Spehro Pefhany wrote:
On Sun, 30 Mar 2008 20:49:36 +0100, the renowned "Dave"
<daveh@xxxxxxxxxxxx> wrote:
I would like to find the simplest way to provide a constant current of around 150uA (+/-20%) at around 2V.
This needs to be discrete components rather than IC and should not involve pulse width modulation.
The simplest form I thought of was a 3v voltage reg with a 20K resistor between it's 'reference ground' and the output but this seems clumsy.
Anyone ?
Thanks
Dave
SOT-23-5 LMV431, an inexpensive SMT BJT and a couple of tiny
resistors.
The TLV431 also comes in SC70-6 and TSOP-5:
http://www.onsemi.com/pub_link/Collateral/TLV431A-D.PDF
--
Regards, Joerg
http://www.analogconsultants.com/
.
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