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TPS92641: Unstable at Lower Ripple Current

Part Number: TPS92641

Hi, team.

When TPS92641 is used by lower ripple current, it is unstable.

My condition is below.

 Vin=72V

 VIADJ=0.76V

 Rcs=100m-Ohm

 Rload=75-Ohm (Vout=57V)

 L=1.5mH

When the inductor was changed to 330uH, it became stable. Why?

When a ripple voltage of a CS terminal is small, does it become unstable?

Best Regards,