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TPS82130: Margin of error for feedback to tracking voltage ratio

Part Number: TPS82130
Other Parts Discussed in Thread: TPS62135

Team,

In the TPS82130 datasheet, or publication SLVA470A, we explain that the ratio of Vfb to Vss/tr is .64. Do we design to this value? If so, do we have any data on error that this value may fluctuate from part to part? I have a customer who requires this value to be as tight as it possibly can be, and wishes to know if we have this information available.