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SLOS417B – OCTOBER 2003 – REVISED JULY 2006
EFFICIENCY
vs
OUTPUT POWER
100
90
80
Efficiency − %
70
60
50
40
30
20
10
0 0
0.2
0.4
0.6
0.8
1
1.2
Class AB.
V
DD
= 5 V,
R
L
= 8
Ω
V
DD
= 2.5 V,
R
L
= 8
Ω,
33
µH
V
DD
= 5 V,
R
L
= 8
Ω,
33
µH
Efficiency − %
90
80
70
60
50
40
30
20
10
0
0
P
O
− Output Power − W
EFFICIENCY
vs
OUTPUT POWER
1.4
V
DD
= 5 V,
R
L
= 4
Ω,
33
µH
1.2
P D − Power Dissipation − W
1
0.8
0.6
0.4
0.2
0
0
POWER DISSIPATION
vs
OUTPUT POWER
Class-AB 5 V, 4
Ω
V
DD
= 3.6 V,
R
L
= 4
Ω,
33
µH
V
DD
= 2.5 V,
R
L
= 4
Ω,
33
µH
Class-AB 5 V, 8
Ω
Class AB.
V
DD
= 5 V,
R
L
= 4
Ω
V
DD
= 5 V, R
L
= 4
Ω,
V
DD
= 5 V, R
L
= 8
Ω
0.5
1
1.5
2
2.5
P
O
− Output Power − W
0.2 0.4 0.6 0.8 1
1.2 1.4 1.6 1.8 2
P
O
− Output Power − W
Figure 1.
POWER DISSIPATION
vs
OUTPUT POWER
0.7
0.6
P D − Power Dissipation − W
Class-AB 3.6 V, 4
Ω
0.5
0.4
0.3
V
DD
= 3.6 V, R
L
= 4
Ω
0.2
0.1
0
0
0.2
0.4
0.6
Class-AB 3.6 V, 8
Ω
I DD − Supply Current − mA
600
Figure 2.
SUPPLY CURRENT
vs
OUTPUT POWER
R
L
= 4
Ω,
33
µH
V
DD
= 3.6 V
I DD − Supply Current − mA
300
250
200
150
100
V
DD
= 3.6 V
Figure 3.
SUPPLY CURRENT
vs
OUTPUT POWER
R
L
= 8
Ω,
33
µH
500
400
V
DD
= 2.5 V
300
200
V
DD
= 2.5 V
50
V
DD
= 5 V
0
V
DD
= 3.6 V,
R
L
= 8
Ω,
33
µH
0.8
1
1.2
100
0
0
0.5
V
DD
= 5 V,
1
1.5
2
2.5
0
0.2
P
O
− Output Power − W
P
O
− Output Power − W
0.4
0.6
0.8
1.2
1
P
O
− Output Power − W
1.4
Figure 4.
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
5
I (SD) − Shutdown Current −
µ
A
4.5
4
3.5
3
2.5
2
2.5
R
L
= 8
Ω,
(resistive)
R
L
= 8
Ω,
33
µH
2
Figure 5.
SUPPLY CURRENT
vs
SHUTDOWN VOLTAGE
3
2.5
1.5
PO − Output Power − W
2
1.5
Figure 6.
OUTPUT POWER
vs
LOAD RESISTANCE
P
O
at 10% THD
Gain = 2 V/V
f = 1 kHz
V
DD = 5 V
I DD − Supply Current − mA
V
DD
= 5 V
1
V
DD
= 3.6 V
V
DD
= 2.5 V
V
DD = 3.6 V
1
V
DD = 2.5 V
0.5
No Load
0
3
3.5
4
4.5
5
5.5
0
V
DD
− Supply Voltage − V
0.1
0.2
0.3
0.4
Shutdown Voltage − V
0.5
0.5
0
4
8
12
16
20
24
28
32
R
L
− Load Resistance −
Ω
Figure 7.
Figure 8.
Figure 9.
6
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