Datasheet

TPA0202
2-W STEREO AUDIO POWER AMPLIFIER
SLOS205B – FEBRUARY 1998 – REVISED DECEMBER 2000
27
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
For example, if the 5-V supply is replaced with a 3.3-V supply (TPA0202 has a maximum recommended V
DD
of 5.5 V) in the calculations of Table 1, then efficiency at 0.5 W would rise from 44% to 67% and internal power
dissipation would fall from 0.62 W to 0.25 W at 5 V. Then for a stereo 0.5-W system from a 3.3-V supply, the
maximum draw would only be 1.5 W as compared to 2.24 W from 5 V. In other words, use the efficiency analysis
to choose the correct supply voltage and speaker impedance for the application.
selection of components
Figure 62 and Figure 63 are a schematic diagrams of a typical notebook computer application circuits.
C
B
1 µF
C
S
0.1 µF
(see Note A)
Right
MUX
RLINEIN
RHPIN
Left
MUX
LHPIN
LLINEIN
Bias, Mute,
Shutdown,
and SE/BTL
MUX Control
+
–
+
–
RBYPASS
MUTE IN
MUTE OUT
SHUTDOWN
LBYPASS
ROUT+
ROUT–
RV
DD
LV
DD
LOUT+
LOUT–
SE/BTL
HP/LINE
C
IR
1 µF
R
IR
10 kΩ
R
FR
50 kΩ
C
FR
5 pF
System
Control
C
IL
1 µF
R
IL
10 kΩ
NC
NC
4
5
6
8
9
11
19
20
21
R
FL
50 kΩ
C
FL
5 pF
100 kΩ
100 kΩ
V
DD
V
DD
C
OUTR
330 µF
C
OUTL
330 µF
10
3
16
7
14
18
15
22
1 kΩ
1 kΩ
0.1 µF
NOTE A: A 0.1 µF ceramic capacitor should be placed as close as possible to the IC. For filtering lower-frequency noise signals, a larger aluminum
electrolytic capacitor of 10 µF or greater should be placed near the audio power amplifier.
Figure 62. TPA0202 Minimum Configuration Application Circuit