Wednesday, 10 January 2018

Is LED properly implemented in the constant current circuit?



Consider this simple constant current source. The voltage is 27 V, yet the indicator LED is rated to a much lower reverse breakdown. Is the LED safe?


Will the LED draw current away from the output load? Output would be less than 1.5 mA.


Simulations in LTSPICE proved LED won't lower output current below 1.5 mA but I don't know for sure.


Circuit




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