100
50
40
60
70
90
30
20
1.6
0
0
OUTPUT POWER (W)
EF
F
IC
IEN
C
Y
(%
)
0.2
0.4
0.6
0.8
1.0
1.2
1.4
80
10
0
-20
-40
-60
-80
-100
20
200
2k
20k
FREQUENCY (Hz)
PSR
R
(d
B
)
FIXED FREQUENCY
SPREAD SPECTRUM
100
50
40
60
70
90
30
20
4.0
0
0
OUTPUT POWER (W)
EF
F
IC
IEN
C
Y
(%
)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
80
10
100
50
40
60
70
90
30
20
3.0
0
0
OUTPUT POWER (W)
EF
F
IC
IEN
C
Y
(%
)
0.5
1.0
1.5
2.0
2.5
80
10
Typical Performance Characteristics
www.ti.com
Boost Amplifier vs Output Power
Boost Amplifier vs Output Power
V
DD
= 5V, R
L
= 8
Ω
V
DD
= 3.6V, R
L
= 8
Ω
f = 1kHz, PV
1
= 7.8V
f = 1kHz, PV
1
= 7V
Boost Amplifier vs Output Power
PSRR vs Frequency
V
DD
= 3V, R
L
= 8
Ω
V
DD
= 5V, R
L
= 8
Ω
f = 1kHz, PV
1
= 4.8V
V
RIPPLE
= 200mV
PP
, PV
1
= 7.8V
6
AN-1922 LM48511 Evaluation Board
SNAA064C – November 2008 – Revised May 2013
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