40V current source operates from -40 to +85°C
The temperature coefficient of D1 offsets that of the LM317LZ, so a temperature range of -40 to +85°C will alter the current limit less than ±100 µA for the 5-mA limit shown. This works for currents from 2.5 to over 20 mA with no special heatsinking and accommodates VIN-VOUT of 40V dc. To use the current source/limit, place an LED, zener diode, switch, etc. in series with the circuit as shown. VIN minimum should be 3.5V plus the voltage drop of the series device.
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Read More Source:
http://www.edn.com/archives/1995/062295/13di3.htm
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