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The TPA112 MSOP Audio Power Amplifier Evaluation Module
3-4
Details
3.2.1 TPA112 Audio Amplifier IC
The TPA112 audio amplifier IC is a CMOS device intended primarily for
high-performance line-level output, headphone driver, and small speaker
applications. It is supplied in both a SOIC and a very small surface-mount
MSOP package and has been designed to operate from low supply voltages
(between approximately 2.5 V and 5.5 V) and to deliver up to approximately
150 mW into 8-Ω speakers. As a line-level driver, distortion levels (THD+N)
are below 0.02% into 10-kΩ loads across the audio band (20 Hz to 20 kHz).
As a headphone driver, distortion levels are below 1% into 32-Ω loads across
the audio band. And as a speaker driver, distortion levels are below 2% into
8-Ω loads across the audio band. Typical applications include portable
computers, desktop computers, personal audio, toys, games, and similar
audio applications.
The IC includes two separate internal amplifiers with onboard short-circuit and
over-temperature protection circuits (Figure 3–4). The load for each channel
is connected between the V
O
pin and GND through a coupling capacitor. For
more information, see the TPA112 amplifier IC data sheet, TI Literature
Number SLOS212.
Figure 3–4. TPA112 Amplifier IC
Over-Temperature
Protection
8
1
7
4
V
O
1
V
O
2
V
DD
5
2
6
IN1–
IN2–
V
DD
IN2+
IN1+3
Short-Circuit
Protection
–
+
–
+