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SLOS407D − FEBRUARY 2003 − REVISED AUGUST 2004
EFFICIENCY
vs
OUTPUT POWER
vs
OUTPUT POWER
LOAD RESISTANCE
100
90
80
70
60
50
40
30
20
12
10
f = 1 kHz,
LC Filter,
Class-D,
Resistive Load,
V
= 12 V,
CC
THD = 10%
R
L
= 8 Ω, V
= 18 V
CC
T
A
= 25°C
R
L
= 4 Ω, V
= 12 V
CC
V
= 12 V,
CC
THD = 1%
8
6
V
= 8 V,
CC
THD = 10%
4
V
= 8 V,
CC
THD = 1%
Class-D,
LC Filter,
Resistive Load
2
0
10
Dashed line may require external heat sinking
0
0
4
6
8
10
12
14
16
2
4
6
8
10
12
R
L
− Load Resistance − Ω
P
O
− Output Power − W
Figure 1
Figure 2
OUTPUT POWER
vs
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
20
19
18
12
8 Ω Speaker
10% THD+N
SD = 2 V,
MODE = 2 V,
Class-D,
10
8
No Load
17
16
15
8 Ω Speaker
1% THD+N
6
4
14
13
12
T
A
= 25°C
11
10
2
8.59
10 11 12 13
15
9
14 15 16 17
18
8.5
10 11 12 13 14
16 17 18
V
CC
− Supply Voltage − V
V
CC
− Supply Voltage − V
Figure 3
Figure 4
11
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