it it is possible to use LM3463 with Vin: 55V and LED in Serie to sink from 1......50mA. Does it works?
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This is low current but it seems it should work. The accuracy at lower current may be offset by the sensing pins on the LM3463. What are you trying to design? Are you planning on using the dynamic headroom control? What is providing the voltage to the IC and LED strings? This part was intended for multiple strings to share current while maintaining a minimum headroom for efficiency improvement.