Datasheet

Operation

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2 Operation

This section describes how to operate the TPA2015D1EVM.

2.1 Quick Start List for Stand-Alone Operation

Use the following steps when operating the TPA2015D1EVM as a stand-alone or when connecting the

EVM into existing circuits or equipment.

2.1.1 Power and Ground

1. Ensure the external power sources are set to OFF.

2. Set the power supply voltage between 2.3 V and 5.2 V. When connecting the power supply to the

EVM, make sure to attach the ground connection to the GND connector first and then connect the

positive supply to the VDD connector. Verify that the connections are made to the correct banana

jacks.

2.1.2 Audio

1. Ensure that the audio source is set to the minimum level.

2. Connect the audio source to the input RCA jack IN. In case of differential audio input ensure that the

jumper JP SE is not inserted. In case of a single-ended audio input ensure that the jumper JP SE is

inserted, thereby grounding IN+ through the input capacitor C2.

3. Connect speakers (8 Ω to 32 Ω) to the output banana jacks OUT+ and OUT–.

4. JP OUT allows the user to connect one the outputs through an RC filter. Note that the user must

provide the necessary resistors, R7 and R8.

5. The unfiltered output of the TPA2015D1 can be measured between test points TP OUT– and TP

OUT+

2.1.3 AGC Control

The TPA2015D1 has four selectable inflection point settings: 3.35 V, 3.55 V, 3.75 V, and disabled.

1. Use jumper AGC shunted between pins 1 and 2 to select the 3.35 V inflection point (AGC1).

2. Use jumper AGC shunted between pins 3 and 4 to select the 3.55 V inflection point (AGC2).

3. Use jumper AGC shunted between pins 5 and 6 to select the 3.75 V inflection point (AGC3).

4. Remove the jumper AGC to disable the inflection point (battery track) feature. Note that the AGC still

works at a limiter level of 6.15 V.

2.1.4 Gain Control

The TPA2015D1 has three gain settings: 6 dB, 15.5 dB, and 20 dB.

1. Use jumper GAIN to set the gain as 6 dB, 15.5 dB or 20 dB. To achieve 6 dB, place the jumper

between heads 1 and 2; for 20 dB, shunt heads 2 and 3; for 15.5 dB, remove the jumper and let the

gain pin float.

2.1.5 Shutdown Controls

1. The TPA2015D1 provides independent shutdown controls for the Class-D amplifier and the boost

converter. Pins ENB and END enable the boost converter and Class-D amplifier, respectively. They

are active high. Press and hold pushbutton S1 to place the boost converter in shutdown. Release

pushbutton S1 to activate the boost converter. If END = HIGH, the boost converter only turns on if an

audio signal (> 1 V

PEAK

) is present at one of the inputs (IN+ or IN-).

2. Press and hold pushbutton S2 to shutdown the Class-D amplifier. Release pushbutton S2 to activate

the Class-D amplifier.

TPA2015D1 Audio Power Amplifier Evaluation Module (EVM) SLOU264–March 2010

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