Other Parts Discussed in Thread: TPS2547
The Current Limit Thresholds Vs. Current Limit Resistance graphs depicted on page 28 of the datasheet don't seem to reasonably match the calculation per equations (4) and (5). The graphs present a much lower variation scenario. For instance, if I choose an 82K resistor to set my desired Ishort-min at 0.5A, the graph suggests the nominal available current will be ~0.6A and the Ishort-max is about 0.7A.
If I do the calculation, Ishort-max comes out at 0.9A! Ishort-min comes out at 0.385A, proving that my minimum current delivery requirement of 0.5A isn't met! The situation is dramatically worse for a charging adapter designed to output 1.5A nominal. Based on the variation arrived at via calculations, it seems the built-incurrent limit function is almost un-useable. In the attachment, the blue lines represent the calculated ranges for Ishort. Does the silicon really vary this much?