Item specifics
Description
XH-M311 Amplifier Board Product Overview
The XH-M311 is a mini digital audio amplifier board based on the TPA3118 chip, utilizing Class D amplification technology with up to 93% efficiency. This mono channel module delivers 60W output power and supports a wide DC 10-24V power supply, compatible with 2-6 ohm speakers. With its compact size (55×40×15mm) and light weight (30g), the XH-M311 is ideal for various audio amplification projects.
XH-M311 Amplifier Board Core Features
TPA3118 Chip： Texas Instruments TPA3118 Class D audio amplifier chip for pure sound and stable performance
High-Efficiency Class D： Up to 93% efficiency, low heat generation, no large heatsink required
Mono 60W Output： Maximum 60W output power for subwoofers and mono applications
Wide Voltage Supply： Supports DC 10-24V, 3A recommended input current, works with various power adapters
Wide Frequency Response： 35Hz-88KHz for balanced bass and treble performance
Mini Size： Only 55×40×15mm, 30g weight, easy to embed into devices
XH-M311 Amplifier Board Applications
Car audio upgrade, subwoofer amplifier, DIY speaker building, multimedia speaker upgrade, public address system
XH-M311 Amplifier Board Key Advantages
Compact Size Easy to Embed： Ultra-small 55×40×15mm fits easily into speaker boxes or device enclosures
High Efficiency Low Heat： 93% efficiency for cool operation without external heatsinks
Wide Voltage Flexibility： DC 10-24V works with 12V car batteries or 24V industrial power supplies
Plug and Play Convenience： Screw terminal connections for input and output, no soldering required
High Value Audio Solution： TPA3118 delivers great sound quality at an affordable price
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FAQ:
What is the XH‑M311 amplifier module and its key specifications?
The XH‑M311 is a compact mono Class‑D audio amplifier board built around the Texas Instruments TPA3118D2 chip. It can deliver up to 60 W into a 4 Ω speaker (or 30 W into 8 Ω) with a 24 V power supply. It operates from a single DC supply of 5 V – 26 V, features a potentiometer for volume control, and includes on‑board pop‑suppression and thermal/over‑current protection. The board measures approximately 3.5 cm × 3.5 cm and is widely used in DIY speakers, portable sound systems, and embedded audio projects.
What power supply do I need for the XH‑M311 TPA3118 amplifier?
The board accepts a wide DC input voltage of 5 V to 26 V. To achieve the full 60 W mono output, a 24 V power supply capable of at least 3 A – 4 A is recommended. For lower volume applications, 12 V provides a good balance of power and heat. Avoid exceeding 26 V, as it may damage the chip. A well‑filtered switching power supply or a battery (e.g., 12 V lead‑acid or 5‑series Li‑Ion) works perfectly.
How much output power can the TPA3118 really deliver?
Power depends on supply voltage and speaker impedance. With a 24 V supply and a 4 Ω speaker, the chip can deliver approximately 60 W (1% THD+N) in mono BTL mode. At 8 Ω, the maximum output is around 30 W. At 12 V, typical output drops to 15 W (4 Ω) / 10 W (8 Ω). These figures are realistic and match the TPA3118 datasheet. The on‑board potentiometer lets you reduce volume without affecting power capability.
How do I connect the XH‑M311 to a speaker and audio source?
Wiring is straightforward. The board has screw terminals for power input (DC 5‑26V) and speaker output (marked OUT+ and OUT‑). Audio input is via a 3.5 mm stereo jack or a 3‑pin header (L/G/R) — but note that this is a mono amplifier; the left and right channels are mixed to mono. Connect your speaker to the output terminals, plug in a suitable power supply, and feed an audio signal. The on‑board potentiometer adjusts volume.
Is the XH‑M311 a stereo or mono amplifier? Can I bridge two boards?
This board is a mono (single‑channel) amplifier. It uses the TPA3118D2 in PBTL (mono BTL) mode to deliver maximum power to a single speaker. If you need stereo, you can use two XH‑M311 boards, each driving one speaker, fed from the same audio source (using a splitter). Do not attempt to bridge two boards together into a single speaker; each board already operates in bridged mode.
How does the TPA3118 achieve 60 W in such a small board? Does it need a heatsink?
The TPA3118 uses advanced Class‑D technology, which is typically over 90 % efficient. This means very little power is wasted as heat. The chip itself has an exposed thermal pad that conducts heat to the PCB copper. For short‑term or moderate power use, the small board may not need an additional heatsink. However, for continuous high‑power operation (close to 60 W), it is recommended to mount a small aluminium heatsink on the TPA3118 chip or ensure good ventilation. The on‑board thermal protection will shut down the amplifier if it overheats.
What protections does the TPA3118 chip have?
The TPA3118D2 includes over‑current protection (OCP), over‑temperature protection (OTP), and under‑voltage lockout (UVLO). The chip also features a built‑in pop‑free startup/shutdown circuit, which eliminates annoying clicks when powering on or off. These protections make the module reliable for long‑term use in embedded applications.
What is the typical efficiency of the TPA3118 Class‑D amplifier?
Efficiency is typically around 90 % – 93 % under normal operation with an 8 Ω load. This high efficiency means that most of the input power is delivered to the speaker, not wasted as heat. Even at lower supply voltages, efficiency remains above 85 %. This is a key advantage over traditional Class‑AB amplifiers, which are typically only 50–70% efficient.
Can I use the XH‑M311 with a battery? What is the quiescent current?
Yes, the wide supply range makes it battery‑friendly. The quiescent current (idle, no signal) is very low — typically 20 mA – 30 mA depending on supply voltage. This means it can be left powered in a portable system without draining the battery quickly. For battery operation, a 12 V lead‑acid or 3S/4S Li‑Ion pack works well. The board does not have a shutdown pin, so to completely turn it off you must disconnect power.
What are the most typical applications for the XH‑M311 TPA3118 module?
It is extremely popular in DIY Bluetooth speakers, portable boomboxes, compact home audio, PC sound upgrades, interactive exhibits, and educational electronics projects. Its small size, high power, and ease of use make it a favourite for hobbyists who need a loud, clean sound from a tiny module.