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TAS5751M: Power amp output changes with PVDD in battery application under constant gain condition.

Part Number: TAS5751M
Other Parts Discussed in Thread: TAS5825M, TAS5805M

 I am using the TAS5751M in a battery application where the PVDD supply will vary from 12V to 24V.  When testing the EVM under a moderate condition 1.5W into PBTL 4 Ohm loads (0.75W per output), the output changes with PVDD.  For example if PVDD=24V and the gain is set to provide 1.5W output power when I drop the supply to 12V, or -6dB, the output also drops 6dB.  I need the level to be stable as the battery discharges.  We would like to avoid adding a boost converter but if this is the only option can you recommend one the is readily available?