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As in CL8800 datasheet, page 8, the document refers to simplified block diagram (Figure 3-6)

How do I calculate the value or R_SET for controlling the amount of current in each tap?

What is the relation between R_SET and I_TAP if V_TAP is given?

Thanks in advance!

http://ww1.microchip.com/downloads/en/DeviceDoc/20005357A.pdf

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It looks like the datasheet provides only this bit of help, in the "Overview" subsection of the "Design Information" section:

Manually selecting values will provide light, but the chosen values may be far from optimal in regards to efficiency, LED utilization, and line regulation. Contact your nearest Microchip Field Applications Engineer for design assistance.

It doesn't look like this device is intended for the casual hobbyist.

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