Thanks guys for cooperation!
@Alex and Tahmid, The datasheet does not specify a minimum current, how can I know that the current below the maximum specified (say 20mA) will be enough for triggering the transistor?
The idea of removing the zener is very good, but I should guarantee that in all cases, the current will be enough, and I don't know the lower limit as i mentioned above :/
@Betwixt, can you suggest a current source IC/Circuit ?
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