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請教TPA3131/32的差異

Other Parts Discussed in Thread: TPA3131D2, TPA3132D2

請教TPA3131D2與TPA3132D2的輸出差異,因為是同一份spec,不了解為何輸出瓦數有差異?

兩款的以下數值相同,RDSon=120m歐姆,GVDD=6.9V,輸出的計算公式也一樣,

TPA3131D2在RL=8歐姆,Vin=7.4V時最大輸出4W*2,

TPA3132D2在RL=8歐姆,Vin=19V時最大輸出25W*2,

以上是何解?難道Vin=19V時,TPA3132D2的GVDD不是6.9V?