The TPA112 MSOP Audio Power Amplifier Evaluation Module
3.2.1TPA112 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-Ωspeakers. As a line-level driver, distortion levels (THD+N) are below 0.02% into 10-kΩloads across the audio band (20 Hz to 20 kHz). As a headphone driver, distortion levels are below 1% into 32-Ωloads across the audio band. And as a speaker driver, distortion levels are below 2% into 8-Ωloads 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 VO 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
| | Short-Circuit |
| | Protection |
| | |
2 | IN 1– |
| | | – |
3 | | |
IN 1+ |
| | | + |
| | |
6 | IN 2– |
| | | – |
5 | | |
IN 2+ |
+
Over-Temperature
Protection
