Texas Instruments TPA721, Руководство пользователя

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The TPA721 MSOP Audio Power Amplifier Evaluation Module
3-3 Details
3.2 The TPA721 MSOP Audio Power Amplifier Evaluation Module
The TPA721 MSOP audio power amplifier evaluation module is powered by
a TPA721 700-mW low-power audio amplifier IC. The EVM includes a
shutdown control signal input with an onboard switch for manual shutdown.
The module can be used with the TI plug-n-play audio amplifier evaluation
platform (Figure 3 –1) or wired directly into circuits or equipment. The module
has single in-line header connector pins mounted to the under side of the
board. These pins allow the module to be plugged into the TI platform, which
automatically makes all the signal input and output, power, and control
connections to the module.
The module connection pins are on 0.1-inch centers to allow easy use with
standard perf board and plug board-based prototyping systems. Or, the EVM
can be wired directly into existing circuits and equipment when used
stand-alone.
The module appears in Figure 3–2 and its schematic is shown in Figure 3 – 3.
Figure 3–2. TPA721 MSOP EVM
OUT+
IN–
GND
Vdd GND
U1 †
Shutdown
R5
OUT–
GND
C4
TEXAS
INSTRUMENTS
SLOP215
TPA721 MSOP EVM
C6
C5
S1
R1
+
R2
C2
C1
R3
R4
C3
† Due to the very small size of the MSOP IC package, the standard part number TPA721 is replaced with the code TIABC
Figure 3–3. TPA721 MSOP EVM Schematic Diagram
C1
1
µ
F
C3
1
µ
F
R1
20 k
Ω
Audio Input–
Shutdown
S1
C6
5 pF
OUT–
GND
OUT+
R5
39 k
Ω
R4
20 k
Ω
No
C4
10
µ
F
C5
1
µ
F
Shutdown
Bypass
In+
In –
V
O –
GND
V
DD
V
O +
8
7
6
5
1
2
3
4
GND
VDD
2.5 V to 5.5 V
+
C2
NA
GND
R3
NA
R2
0
Ω
Note: NA is not assembled on PCB.