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TPS7A91: TPS7A9101: Output ripple 1.4KHz

Part Number: TPS7A91

Customer observed 1.4KHz ripple at output.

This was tested with clean input supply. TPS7A91 seems to be the one generating the 1.4KHz.

They tried changing capacitor values:

Pin 8 to Gnd: Tried 10nF & 10uF

Pin 1 to Pin 3 (FB): Tried 10nF & 10uF.

Both cases did not help to reduce the ripple. Is there any other recommendation for reducing output ripple?