2x30W Amp click
PID: MIKROE-3010
Weight: 31 g
2x30W Amp click 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.
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Table of contents
1. How does it work?
2. Specifications
3. Pinout diagram
4. 2x30W Amp electrical
characteristics
5. Onboard settings and indicators
6. Software support
7. mikroSDK
8. Downloads
2x30W Amp click 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
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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, 2x30W Amp 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 it work?
The main component of the 2x30W Amp click 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 , 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 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 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 2x1 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
ON
ON
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 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
Input Voltage 5V
Click board size L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on 2x30W Amp click corresponds to the
pinout on the mikroBUS™ socket (the latter shown in the two middle
columns).
Notes Pin Pin Notes
NC 1AN PWM 16 NC
Reset/SDZ IN RST 2RST INT 15 FLT FAULTZ OUT
Mute IN MT 3CS RX 14 NC
NC 4SCK TX 13 NC
NC 5MISO SCL 12 NC
NC 6MOSI SDA 11 NC
NC 73.3V 5V 10 +5V Power supply
Ground GND 8GND GND 9GND Ground
2x30W Amp electrical characteristics
Description Min Typ Max Unit
External PSU Voltage 4.5 26 V
Minimum load Impedance 4Ω
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
Software support
We provide a library for 2x30W Amp click on our Libstock page, as well as a
demo application (example), developed using MikroElektronika compilers.
The demo application can run on all the main MikroElektronika development
boards.
Library Description
The library allows the device to be enabled or disabled and allows the mute
and the unmute operation. The library also has the ability to check fault
condition (over current, over temperature and too high DC offset condition).
For more details check the documentation.
Key functions:
void c2x30wamp_enable( uint8_t state ) - The function allows the device
to be enabled or disabled.
void c2x30wamp_mute( uint8_t state ) - The function performs the mute or
the unmute operation.
uint8_t c2x30wamp_checkDiagnostic( void ) - The function checks if the
device in a fault condition or in a normal operation state.
Examples Description
The demo application is composed of three sections:
System Initialization - Initializes peripherals and pins.
Application Initialization - Initializes GPIO driver and allows the device to be
enabled.
Application Task - (code snippet) - Allows the mute operation for a period of 4
seconds,
and after that allows the unmute operation for a period of 10 seconds. After that
time, it checks if the overcurrent fault, over temperature fault or too high DC
offset fault occurred.
Note: When under or overvoltage condition occurs the output goes to high
impedance state,
but the FAULT pin will not be asserted.
void applicationTask()
{
c2x30wamp_mute( _C2X30WAMP_MUTE );
Delay_ms( 4000 );
c2x30wamp_mute( _C2X30WAMP_UNMUTE );
Delay_ms( 10000 );
faultCheck = c2x30wamp_checkDiagnostic();
if (faultCheck == 0)
{
mikrobus_logWrite( "Fault condition!", _LOG_LINE );
}
}
The full application code, and ready to use projects can be found on our
Libstock page.
mikroE Libraries used in the example:
UART
Additional notes and information
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Depending on the development board you are using, you may need USB
UART click, USB UART 2 click or RS232 click to connect to your PC, for
development systems with no UART to USB interface available on the board.
The terminal available in all MikroElektronika compilers, or any other
terminal application of your choice, can be used to read the message.
mikroSDK
This click board is supported with mikroSDK - MikroElektronika Software
Development Kit. To ensure proper operation of mikroSDK compliant click
board demo applications, mikroSDK should be downloaded from the
LibStock and installed for the compiler you are using.
For more information about mikroSDK, visit the official page.
Downloads
mikroBUS™ Standard specification
LibStock: mikroSDK
TPA3128D2 datasheet
Libstock: 2x30W Amp click library
2x30W Amp click schematic
2x30W Amp click: 2D and 3D files
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