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SA58670A_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 23 October 2008 15 of 24
NXP Semiconductors
SA58670A
2.1 W/channel stereo class-D audio amplifier
a. R
L
=4Ω b. R
L
=8Ω
(1) V
DD
= 5.0 V.
(2) V
DD
= 3.6 V.
(3) V
DD
= 2.5 V.
Fig 14. Power dissipation as a function of output power
0
0.6
0.4
0.2
0.8
P
(W)
P
o
(W)
0 2.01.60.8 1.20.4
001aah511
(1)
(3)
(2)
0
0.3
0.2
0.1
0.4
P
(W)
P
o
(W)
0 1.61.20.4 0.8
001aah512
(1)
(3)
(2)
a. R
L
=4Ω b. R
L
=8Ω
(1) V
DD
= 5.0 V.
(2) V
DD
= 3.6 V.
(3) V
DD
= 2.5 V.
Fig 15. Output power efficiency as a function of output power
40
60
20
80
100
η
po
0
P
o
(W)
0 2.01.60.8 1.20.4
001aah513
(1)
(3)
(2)
40
60
20
80
100
η
po
0
P
o
(W)
0 1.61.20.4 0.8
001aah514
(2)
(1)
(3)