TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 60 of 66
NXP Semiconductors TFA9812
BTL stereo Class-D audio amplifier with I2S input

VP = 12 V; fi = 1 kHz; Power dissipation in junction only

(1) RL = 2 × 6 Ω
(2) RL = 2 × 8 Ω
VP = 12 V; fi = 1 kHz; ηpo = (2 × Po) / (2 × Po + Pd)
(1) RL = 2 × 6 Ω
(2) RL = 2 × 8 Ω

Fig 25. Power dissipation as a function of output

power Fig 26. Efficiency as a function of output power

010aaa496
1
2
3
P
(W)
0
Po (W/channel)
10−2102
1010−11
(1) (2)
Po (W/channel)
0108462
010aaa497
40
60
20
80
100
ηPO
(%)
0
(1)
(2)
VP = 12 V; PO = 1 W
(1) RL = 2 × 6 Ω
(2) RL = 2 × 8 Ω

Fig 27. Channel separation as a function of frequency

010aaa498
−60
−40
−80
−20
0
αcs
(dB)
−100
f (Hz)
10 105
104
102103
(1)
(2)