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TPS56428: Output Capacitor Selection

Part Number: TPS56428

The datasheet for this device specifies output capacitance values from 20-68uF. Are these values nominal values? Or are they referring to the effective capacitance values? Since these are high dielectric constant ceramic capacitors, they have a large de-rating based on DC bias. We are specifying two 47uF capacitors, which, nominally, is outside of the 20-68uF range. But the effective capacitance with de-rating is within the range. Is this the correct way to specify these capacitors?