Just one simple Q about LT3476 VREF pin, can i connect it to a digital potentiometer directly for dimming tuning instead of resistor string? Thank you so much.
The Electrical Characteristics table in the LT3476 datasheet indicates that REF is characterized up to 200uA, so it should be o.k. to load REF with a digital potentiometer as you mention, especially if the current is around 200uA and below. I show the REF line item from the LT3476 datasheet EC table in the image below: