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MIKROE-2477
25 g
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2x5W AMP Click is a compact add-on board that amplifies the audio input to the desired level. This board features the TDA7491LP, a 2x5 watt dual BTL class-D audio amplifier from STMicroelectronics. It can produce 5W + 5W continuous output power with high efficiency (90%) over a single power supply. Four selectable fixed gain settings are available to the user, nominally of 20dB, 26dB, 30dB, and 32dB. This Click board™ makes the perfect solution for the development of LCD TVs, monitors, sound systems, and more.
2x5W AMP Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.
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2x5W AMP Click is based on the TDA7491LP, a 2x5-watt dual BTL class-D audio amplifier from STMicroelectronics. It uses differential inputs to minimize common-mode noise and features filter-less operation. Furthermore, the filter-less operation allows a reduction in the external components. In addition, it features standby and mute, short circuits, undervoltage, overcurrent, and thermal overload protections, and no "pop" at turn-on/off. Thanks to the high efficiency and exposed-pad-down (EPD), it does not require a heatsink.
Class-D audio amplifiers (switching amplifiers) are very energy efficient. They reduce power losses on the output device by operating as an electronic switch rather than as linear gain devices, like in A or AB amplifiers. The output modulation scheme of the BTL is called unipolar pulse width modulation (PWM). An advantage of this scheme is that it effectively doubles the switching frequency of the differential output waveform on the load and then reduces the current ripple accordingly.
The two input pins set one of the three modes on TDA7491LP. The Standby mode has very low consumption, where all circuits are turned off. All inputs are connected to the ground in the Mute mode, and the positive and negative PWM outputs are in a 50% duty cycle. In the Play mode, all amplifiers are active. The gain is set over two GAIN inputs by combining logic states (the table is available in the attached datasheet).
To communicate with the host MCU, the 2x5 AMP Click does not use standard serial communication; a few IO pins of the mikroBUS™ socket control it. Pins GN0 and GN1 are used to set the gain with a combination of logic states, according to the table in the datasheet. The STB and MUTE pins set the audio amplifier's operating mode. The diagnostic output of the DIA pin has different behaviors depending on the various protection conditions.
To achieve full 2x5W output power, remember to supply enough power to the chip. This is achievable with the EXT PWR header, but you need to switch over the AMP VCC to the left position. Over the EXT PWR header, the 2x5 AMP Click can be powered with a wide-range single supply (5V – 14V).
This Click board™ can be operated only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Type
Amplifier
Applications
Can be used for the development of LCD TVs, monitors, sound systems, and more
On-board modules
TDA7491LP - 2x5-watt dual BTL class-D audio amplifier from STMicroelectronics
Key Features
2x5W output power, short-circuit, thermal overload, overcurrent, undervoltage protections, 3.5mm audio jack, screw terminals for passive speakers, four selectable fixed gains, three mode of operation, wide range single supply operation, filter-less operation, and more
Interface
GPIO
ClickID
No
Compatibility
mikroBUS™
Click board size
L (57.15 x 25.4 mm)
Input Voltage
3.3V,5V
This table shows how the pinout on 2x5W AMP Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
Label | Name | Default | Description |
---|---|---|---|
- | PWR | - | Power LED Indicator |
- | AMP VCC | Right | Amplifier Power Source Selection EXT/5V: Left position EXT, Right position 5V |
Description | Min | Typ | Max | Unit |
---|---|---|---|---|
Supply Voltage | - | 5 | - | V |
External Power Supply | 5 | - | 14 | V |
Output Power | - | - | 5 | W |
NOTE: Please be advised that any peripheral devices or accessories shown connected to the Click board™ are not included in the package. Check their availability in our shop or in the YMAN section below.