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Application Report
SNAA042B–May 2007–Revised May 2013
AN-1614 LM48510 Speaker Application
.....................................................................................................................................................
ABSTRACT
This application report provides information on the performance of the LM48510 and the LM4673 in a
stereo application.
Contents
1 General Description ......................................................................................................... 2
2 Typical Performance Characteristics ..................................................................................... 3
3 Application Information ..................................................................................................... 6
3.1 Selecting the Output Voltage (v1) of Boost Converter ........................................................ 6
3.2 Feed-Forward Compensation for Boost Converter ............................................................ 6
3.3 Diode ................................................................................................................ 6
3.4 Inductor .............................................................................................................. 6
3.5 Calculating Output Current of Boost Converter (I
AMP
) ......................................................... 7
3.6 Single-Ended Circuit Configuration .............................................................................. 8
4 Revision Table ............................................................................................................... 8
List of Figures
1 LM48510 Stereo Typical Application .................................................................................... 2
2 THD+N vs Frequency V
CC
= 3.3V, V
1
= 5.0V, R
L
= 15μH+4Ω+15μH P
O
= 500mW, 22kHz BW.................. 3
3 THD+N vs Frequency V
CC
= 3.3V, V
1
= 5.0V, R
L
= 15μH+8Ω+15μH P
O
= 500mW, 22kHz BW.................. 3
4 THD+N vs Frequency V
CC
= 4.2V, V
1
= 5.0V, R
L
= 15μH+4Ω+15μH P
O
= 500mW, 22kHz BW.................. 3
5 THD+N vs Frequency V
CC
= 4.2V, V
1
= 5.0V, R
L
= 15μH+8Ω+15μH P
O
= 500mW, 22kHz BW.................. 3
6 THD+N vs Output Power V
CC
= 3.3V, V
1
= 5.0V, R
L
= 15μH+4Ω+15μH 22kHz BW ............................... 3
7 THD+N vs Output Power V
CC
= 3.3V, V
1
= 5.0V, R
L
= 15μH+8Ω+15μH 22kHz BW ............................... 3
8 THD+N vs Output Power V
CC
= 4.2V, V
1
= 5.0V, R
L
= 15μH+4Ω+15μH 22kHz BW ............................... 3
9 THD+N vs Output Power V
CC
= 4.2V, V
1
= 5.0V, R
L
= 15μH+8Ω+15μH 22kHz BW ............................... 3
10 Power Dissipation vs Output Power V
CC
= 3.3V ........................................................................ 4
11 Power Dissipation vs Output Power V
CC
= 4.2V ........................................................................ 4
12 Power Supply vs Output Power V
CC
= 3.3V ............................................................................. 4
13 Power Supply vs Output Power V
CC
= 4.2V ............................................................................. 4
14 Supply Current vs Supply Voltage R
L
= ∞................................................................................ 4
15 Boost Load vs Output Power V
DD
= 3.3V, R
L
= 4Ω...................................................................... 4
16 Boost Load vs Output Power V
DD
= 3.3V, R
L
= 8Ω...................................................................... 5
17 Boost Load vs Output Power V
DD
= 4.2V, R
L
= 4Ω...................................................................... 5
18 Boost Load vs Output Power V
DD
= 4.2V, R
L
= 8Ω...................................................................... 5
19 Inductor Current............................................................................................................. 7
List of Tables
1 LM48510SD + LM4673SD Demoboard.................................................................................. 2
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1
SNAA042B–May 2007–Revised May 2013 AN-1614 LM48510 Speaker Application
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