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TAS2780: 输出功率与效率不符，效率过低

Alger J
Prodigy 10 points
Part Number: TAS2780
Other Parts Discussed in Thread: LM3478

TI工程师：

   我们在使用tas2780这款功放时，在PWR_MODE0电源模式，PVDD由电池(2500MaH,3.7V)升压而来=12V,VBATS=电池电压=3.7~4.2V.

   我们稳压源供电4.2V，输入1khz 0db sine信号，4Ω负载时，功放功率为5W，但是此时稳压源显示为4.2V 3A = 12W，因此功放的效率应该只有5/12=40%左右，按照规格书，应该有80%+效率。

   请帮忙查看可能是什么原因。