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TPS56720: Large ripple voltage observed on output

Part Number: TPS56720

Hi TI,

Please review the schematic of TPS56720.

Design parameters are:

Voltage: 1.5v

Nominal Current : 400mA - 500mA

Output Ripple: less than 15mVp-p

We are observing a large ripple voltage on output for the above mentioned current.

Please suggest how we can reduce the ripple for our output current requirement.

   Thanks,

Lalit