Elecbee XH-M189 TPA3116D2 Stereo Class-D Amplifier Board, 2x50W Max, DC 5-24V

Elecbee XH-M189 TPA3116D2 Stereo Class-D Amplifier Board

The Elecbee XH-M189 is a compact two-channel Class-D amplifier board based on the TPA3116D2. It amplifies compatible analog left and right audio signals for stereo speakers.

The module supports a regulated DC 5–24V power input and compatible 4–8Ω speaker loads. It is suitable for DIY stereo amplifiers, active speakers, desktop audio systems and compact equipment requiring a stereo power-amplifier stage.

 

Technical Specifications

Model: XH-M189
Amplifier Device: TPA3116D2
Amplifier Architecture: Class D
Audio Input Type: Analog audio
Output Configuration: Two-channel stereo
Channels: Left and right
Maximum Advertised Output: Up to 2 × 50W
Board Input Voltage: DC 5–24V
Speaker Load: 4–8Ω
Specified Audio Range: 20Hz–20kHz
Maximum IC Switching Frequency: Up to 1.2MHz
Dimensions: Approximately 100 × 50 × 22mm

Frequency Correction: The supplied “20Hz–20Hz” specification was incomplete and has been corrected to 20Hz–20kHz. The separate 14–100kHz value was removed because its measurement type and test conditions were not defined.

Class-D Terminology: The term “digital power amplifier” describes the switching output architecture. It does not mean that the board accepts USB, optical, coaxial, HDMI or another digital audio signal.

 

2×50W Output Conditions

The board provides separate amplified outputs for the left and right speakers. The advertised maximum is 50W per channel.

Texas Instruments specifies 2 × 50W operation for the TPA3116D2 with a 21V supply and 4Ω BTL loads under defined device-level test conditions. The finished XH-M189 board’s actual output depends on power-supply capacity, speaker impedance, signal level, distortion limit, cooling and wiring.

Lower supply voltages substantially reduce available power. Output into an 8Ω speaker will also be lower than the maximum advertised figure.

The 2 × 50W specification must not be interpreted as guaranteed continuous RMS output under every operating condition.

 

DC Power-Supply Requirements

Use a regulated DC power supply between 5V and 24V. Lower voltages are suitable for reduced-power operation, while higher output requires a suitable power supply near the upper end of the range.

Maximum Voltage: Do not exceed 24V at the board input. The underlying IC’s wider device-level voltage range does not override the complete board’s specified limit.

Current Capacity: The required supply current depends on output level, speaker impedance and music content. An undersized supply may cause voltage drop, distortion, unstable operation or shutdown.

Polarity: Confirm the positive and negative input terminals before applying power. Although reverse-polarity protection is supplier-specified, correct polarity should always be observed.

 

Class-D Operation

The TPA3116D2 uses an efficient switching power stage to amplify the incoming analog audio signal. Its Class-D architecture reduces power loss and heat generation compared with conventional linear amplifiers at comparable output levels.

The amplifier IC supports switching frequencies up to 1.2MHz. This specification describes internal power-stage switching and must not be confused with audio frequency response or digital sampling rate.

 

Protection Functions

The XH-M189 is designed to reduce audible popping during normal power-on and power-off transitions. Results may vary with the audio source, power sequence, wiring and connected equipment.

The board is supplied with reverse-connection protection. The TPA3116D2 also provides IC-level protection against output short circuits, excessive temperature, overvoltage, undervoltage and DC faults.

These functions reduce fault risk but do not permit intentional short circuits, incorrect wiring, unsuitable speakers or operation outside the specified supply range.

 

BTL Speaker Wiring

Connect each speaker only between the positive and negative terminals assigned to that channel.

The outputs use a bridged configuration. Neither speaker terminal is a ground connection. Do not connect speaker outputs to the DC input ground, chassis ground or audio-input ground.

Do not join the negative terminals of the left and right channels. Common-ground speaker systems and grounded test equipment may damage the amplifier.

Complete and inspect all audio-input, speaker and power connections before switching on the power supply.

 

Installation and Cooling

The board measures approximately 100 × 50 × 22mm. Allow additional enclosure space for wiring, controls and ventilation.

Install the board in a dry, ventilated enclosure and keep it away from conductive objects. Use short, adequately sized power and speaker wires.

Route low-level audio cables away from speaker outputs, power converters, motors and other potential interference sources.

If the board becomes excessively hot, repeatedly enters protection mode or produces strong distortion, reduce the volume and check the speaker loads, power supply, wiring and airflow.

 

Applications

The XH-M189 can be used in compatible DIY stereo amplifiers, active speaker systems, desktop audio projects, replacement amplifier stages and educational audio-electronics projects.

An analog audio source, regulated DC power supply, compatible speakers, enclosure and any required volume-control or preamplifier components must be selected separately unless explicitly included.

 

Package Contents

1 × XH-M189 TPA3116D2 stereo amplifier board

1 × Cable

1 × Small fitting set

 

Preinstallation Checklist

Check the Supply: Use regulated DC 5–24V and never exceed 24V.

Check the Speakers: Use compatible 4–8Ω loads.

Observe Polarity: Verify the power-input terminals before switching on.

Isolate the Outputs: Never ground or combine the speaker-output terminals.

Complete Wiring First: Connect and inspect all wiring before applying power.

Start at Low Volume: Increase the input level gradually while monitoring sound quality and temperature.