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More than Circuit EngineeringLight-emitting diode – temperature compensates
Ñõåìû >> Circuit engineering >> Light-emitting diode – temperature compensatesLight-emitting diode – temperature compensates
Almost the ideal temperature independent current source is pointed on fig.1. For different light-emitting diodes, falling of the voltage
Ud hesitates in limits from 1.4 V to 2.2 V at the change of current from 5 mA to 10 mA. The current of source is determined by a formula:
Ik = (Ud – Ube)/Re. A current through a light-emitting diode is set by the resistor
Rd.
Fig. 1. Temperature compensation of current source through a light-emitting diode.
added 17.01.09 00:20:27 | 
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