NXP Semiconductors TDA8932B - Manual (Page 31)

TDA8932B_4 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 04 — 18 December 2008 31 of 48
NXP Semiconductors
TDA8932B
Class-D audio amplifier
f
i
= 1 kHz (short time P
O
); dashed line will require heat
sink for continuous time output power
(1) R
L
= 2 × 4 Ω ; THD+N = 10 %
(2) R
L
= 2
×
4
Ω
; THD+N = 0.5 %
(3) R
L
= 2
×
8
Ω
; THD+N = 10 %
(4) R
L
= 2
×
8
Ω
; THD+N = 0.5 %
f
i
= 1 kHz; power dissipation in junction only; short time
P
o
at THD+N = 10 %; dashed line will require heat sink
for continuous time output power
(1) R
L
= 2 × 4 Ω
(2) R
L
= 2
×
8
Ω
Fig 19. Output power per channel as a function of
supply voltage
Fig 20. Power dissipation as a function of supply
voltage
V P (V)
10 38 30 34 14 18 22 26
001aaf886
16
8
24
32
P
o
(W/channel)
0
(4)
(1)
(2)
(3)
V
P
(V)
10 38 34 14 18 22 26 30
001aaf889
2
4
6
P
(W)
0
(2)
(1)
f
i
= 1 kHz;
(1) V
P
= 22 V; R
L
= 2 × 4 Ω
(2) V
P
= 30 V; R
L
= 2
×
8
Ω
f
i
= 1 kHz; power dissipation in junction only
(1) V
P
= 22 V; R
L
= 2
×
4
Ω
(2) V
P
= 30 V; R
L
= 2 × 8 Ω
Fig 21. Output power efficiency as a function of
output power per channel
Fig 22. Power dissipation as a function of output
power per channel (two channels driven)
P o (W/channel)
0 20 15 5 10
001aad780
40
60
20
80
100
η
po
(%)
0
(2)
(1)
001aad781
1.0
2.0
3.0
P
(W)
0
P o (W/channel)
10
− 2 10 2 10 10
− 1 1
(2)
(1)
η
PO
2 P
o
×
2 P
o
p +
Ч
------------------------- =