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TPS40422: The measured Loop feedback is different to SLUC263C

Part Number: TPS40422

We tried to adjust the loop feedback of TPS40422 according to SLUC263C. However, the FCO was nearly 20KHz we measured but it was 71KHz at the table.

We tried to put the 20ohm resistor in the red circle to measure loop feedback, two times. The results were same. Is it the right way to measured it?