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Mikroelektronika d.o.o.

2 x 30W Amp Click Board

2 x 30W Amp Click Board

30W Stereo, Class D Audio Amplifier
SKU: MIKROE-3010
Regular price
£30.20 inc VAT
£25.20 exc VAT
Regular price £36.00 GBP Sale price
£30.20 inc VAT
£25.20 exc VAT
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Overview

Enhance your audio experience with the amazing 2 x 30W Amp Click Board. This compact class-D audio amplifier packs a punch with its impressive output power, surpassing expectations for its size.

Featuring a high-efficiency amplifier IC exceeding 90%, the 2 x 30W Amp Click Board utilizes an efficiency boost mode to minimize current ripple and optimize performance. Say goodbye to bulky heatsinks, as this amplifier delivers exceptional power without compromising on space.

  • Experience powerful sound quality with 2 x 30 watts of output power
  • Benefit from integrated self-protection circuits for added safety and reliability

Equipped with over-voltage, under-voltage, and over-temperature protection, the 2 x 30W Amp Click Board ensures your audio setup remains secure under various conditions. Detect output DC offset and short circuits effortlessly, thanks to its advanced features.

Enjoy seamless audio amplification with this versatile click board that offers both performance and protection in a compact design. Whether you're an audio enthusiast or a professional in need of reliable amplification, the 2 x 30W Amp Click Board is your go-to solution.

Elevate your audio projects with the 2 x 30W Amp Click Board and unlock a new level of sound clarity and power. Upgrade your setup today and experience audio like never before.

The 2x30W Amp Click Board™ is a class-D audio amplifier with a tremendous output power, considering its size and lack of huge heatsinks, usually associated with the audio amplifiers. This is due to the fact that the efficiency of the amplifier IC is quite high (greater than 90%), featuring the efficiency boost mode, which dynamically reduces the current ripple of the external LC filter and current in idle mode. The integrated self-protection circuits include overvoltage, undervoltage, and overtemperature protection, output DC offset detection, as well as the short circuit detection, with the error reporting feature, via the dedicated pin.

With the power efficiency and low power consumption in mind, the 2x30W Amp click is a  perfect solution for battery powered active speakers . Due to a low idle current, as low as 25mA, the battery power consumption is greatly reduced, especially when the amplifier is idling. Equipped with all these features, the 2x30W Amp Click Board™ is an ideal tool for building various audio applications that require an output amplification with very low noise and distortion (THD), such as wireless Bluetooth speakers, home theater systems, mini and micro audio components, and similar.

How Does The 2x30W Amp Click Board™ Work?

The main component of the 2x30W Amp Click Board™ is TPA3128, 2x30-W class-D amplifier with low idle power dissipation, from Texas Instruments. The most important characteristic of this IC is its output efficiency, which reduces the need for bulky heat sinks, usually associated with the audio amplifiers. This is accomplished by using switching MOSFET outputs, which have very low RDS ON , as low as 90 mΩ.

Unlike class A or class AB amplifiers, class D amplifiers are way more efficient , by design. Class D amplifier working principles are based on the switching characteristic of the transistors, rather than the linear characteristic, used for the A/AB class amplifiers. The audio signal is encoded into a PWM signal with the fixed amplitude. An output signal is restored by running it through the LC filter and the speaker itself. Since the basis of this principle is switching of the signal, and the transistors are either fully ON or fully OFF, they spend very little time in the linear region, and dissipate very little power. Using low RDS ON  MOSFETs becomes possible and desirable so that the efficiency goes up to 90% and over.

2x30W Amp click is designed to work with 2 channels of a single-sided audio source, connected via the  3.5mm stereo audio jack , which is provided on board.

The 2x30W Amp Click Board™ is equipped with a connector for the external power source. By default, the 2x30 Amp click is supplied via the mikroBUS™ 5V rail, which limits the output power. For the full output power, an adequate external power supply should be used. The TPA3128 IC can handle up to 26V. To select operation via the external power supply, the onboard SMD jumper should be switched to the desired position (EXT or 5V). If EXT position is selected, the external power supply should be connected via the 1x2 header on the side of the Click board™, labeled as VEXT.

The connected speaker impedance should not be less than 4Ω. The speakers can be connected via two edge connectors, with clearly labeled input ports: L+ and L- for connecting the left speaker positive and negative terminals; R+ and R- for connecting the right speaker positive and negative terminals. Care should be taken to dimension the speakers according to the maximum output power of the amplifier.

The amplifier has fixed gain of 32dB, determined by two resistors, labeled as R4 and R5 on the provided schematic.

The RST pin of the mikroBUS™ is routed to the SDZ pin of the TPA3128 IC. Setting this pin to a LOW logic level will set the TPA3128 IC in the shutdown mode, with its output stage set to a high impedance (Hi-Z), reducing the idle current to a minimum. It is a good practice to pull the SDZ (RST) pin to a LOW logic level before disconnecting the power from the Click board™ to avoid audible power-off clicks. RST pin is pulled up to a HIGH logic level by the onboard resistor.

Another way to mute the speakers is pulling the MUTE pin to a HIGH logic level. This pin is routed to the CS pin of the mikroBUS™ and it is labeled as the MT. Pulling this pin to a HIGH logic level will also set the output stage to a Hi-Z, but it will perform muting function only, thus muting the IC faster than the complete shutdown with the SDZ pin. This function is useful if used in conjunction with the FAULT pin, allowing power-up in a muted state when there is a problem on the output stage.

FAULTZ pin is routed to the INT pin of the mikroBUS™ and it is labeled as the FLT. It is used to signalize the fault condition (overtemperature, output DC offset detection) to the host MCU. It is active low and can be used to trigger an interrupt request on the host MCU so that the proper action can be taken.

The 2x30W Amp Click Board™ uses only GPIO pins, so the usage is extremely simple. However, the Click board™ comes with the library that contains functions for the mikroC, mikroBASIC and mikroPASCAL compilers, which simplify using this Click board™ even more. The provided example application demonstrates their use and it can be used as a reference for a custom design.

SPECIFICATIONS

Type Amplifier
Applications Various audio applications that require an output amplification with very low noise and distortion (THD), such as wireless Bluetooth speakers, home theater systems, mini and micro audio components, and similar.
On-board modules TPA3128, 2x30-W class-D amplifier with low idle power dissipation, from Texas Instruments
Key Features High output power with reasonably low voltage and no heat sinks, low THD and SNR, integrated short circuit detection, output DC offset detection, overvoltage, undervoltage, and overtemperature protection
Interface GPIO
Compatibility mikroBUS
Click board size L (57.15 x 25.4 mm)
Input Voltage 5V,External

PINOUT DIAGRAM

This table shows how the pinout on the 2x30W Amp Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
NC 1 AN PWM 16 NC
Reset/SDZ IN RST 2 RST INT 15 FLT FAULTZ OUT
Mute IN MT 3 CS RX 14 NC
NC 4 SCK TX 13 NC
NC 5 MISO SCL 12 NC
NC 6 MOSI SDA 11 NC
NC 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground


2X30W AMP ELECTRICAL CHARACTERISTICS

Description Min Typ Max Unit
External PSU Voltage 4.5 26 V
Minimum load Impedance 4
Continuous output power 30 W
Total Harmonic Distortion (THD) at P = 15W 0.1 %
Signal-to-Noise Ratio (SNR) 102 dB


ONBOARD SETTINGS AND INDICATORS

Label Name Default  Description
LD1 PWR - Power LED indicator
JP1 EXT / 5V Right Power supply selection: left position external PSU, right position 5V
CN1 - - 3.5mm stereo jack for audio input
TB2 L- L+ - Left speaker connector
TB4 R+ R- - Right speaker connector

 

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