Hi
I have a circuit including 15 LED. The system that I used is similar to the analog device reference design. it works fine but there is a problem.
when I turn the led off (+ input pin of op amp connected to GND), a very dim glow remains and the LED does not shut down completely.
the only difference between the attached schematic and my circuit is that I use AD8618 and ADG633. the rest is almost the same. LEDs are connected to +5 V.
I checked most of the pins and voltages and unfortunately I could not find the problem.
would you please help me to find the problem.
thank you
I have a circuit including 15 LED. The system that I used is similar to the analog device reference design. it works fine but there is a problem.
when I turn the led off (+ input pin of op amp connected to GND), a very dim glow remains and the LED does not shut down completely.
the only difference between the attached schematic and my circuit is that I use AD8618 and ADG633. the rest is almost the same. LEDs are connected to +5 V.
I checked most of the pins and voltages and unfortunately I could not find the problem.
would you please help me to find the problem.
thank you
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