Texas Instruments TPA301 - Manual (Page 17)

The TPA301 Audio Power Amplifier Evaluation Module
3-3 Details
3.2 The TPA301 Audio Power Amplifier Evaluation Module
The TPA301 audio power amplifier evaluation module is powered by a TPA301
350-mW low-power audio amplifier IC and includes onboard gain adjustment,
a shutdown control signal input with onboard switch, and can be operated in
either the BTL or single-ended output mode.
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 to 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. TPA301 EVM
C4
R3
IN+
C2
Shutdown
R1
R2
C1
C6
C3 C5
R5
DL
OUT–
GND
OUT+
GND
S1
GND +5 V
R4
EVM
–3
Lit.#
SLOP 115
U1
TPA301
Figure 3–3. TPA301 EVM Schematic Diagram
C2
2.2
µ
F
C5
0.1
µ
F
C1
1
µ
F
R1
20 k
Ω
Audio Input+
Audio Input–
Shutdown
S1
C4
5 pF
Dummy
Load
OUT–
GND
OUT+
R3
20 k
Ω
R4
200 k
Ω
R2
20 k
Ω
No
C6
10
µ
F
R5
510
Ω
C3
2.2
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
+