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I am looking at the NSI45060 device and would like to know what the formula is for calculating Radj. Where can I purchase an EVM for this product?
For Radj the figure on the datasheet estimates what resistance is needed to adjust for a chosen current.The adjustment depends on various conditions such as the board thickness, copper thickness, footprint area, and ambient temperature.
You should breadboard or build a prototype and test it to find the precise adjustment.