Mixed Signal/Analog

Audio amplifiers use multilevel switching technology

13th August 2019
Mick Elliott

A range of audio amplifier solutions which use pioneering multilevel switching technology to increase audio performance and reduce power loss during operation are available at Farnell. Infineon’s MERUS range of Class D audio amplifier solutions deliver extreme reliability and stability for the entire product lifetime.

The new range offers improved power efficiency, decreased size, weight, electromagnetic interference and lower overall cost than traditional solutions on the market.

Electronics engineers can use MERUS Class D audio solutions in a range of applications such as battery-operated speakers, wireless and docking speakers, soundbars, multiroom systems and home theatre systems.

The MERUS portfolio includes fully integrated monolithic audio amplifier ICs, multi-chip audio amplifier modules (MCMs), as well as discrete audio amplifier driver IC and power MOSFET solutions, scalable to meet the most stringent and demanding application needs.

The MA12040P (for 4-18V supply voltage range) and the MA12070P (for 4-26V supply voltage range), are suitable for battery operated speakers, wireless and docking speakers, soundbars and multiroom/home theatre systems.

Both feature an embedded digital power management scheme with an algorithm that dynamically adjusts switching frequency and modulation to optimise power loss and EMI across the output power range. Integrated digital-to-analogue converters enable digital I2S audio stream input.

The amplifiers support sample rates from 44.1kHz to 192kHz and offer protection against DC, short circuits, over-temperature and under-voltage situations. Flexible “power mode profiles” allow the user to utilise the multilevel switching technique for very low power loss or very high audio performance.

Also available, for Analogue input, are the complementary MA12040 and MA120070.

The EVAL AUDIO MA12070P is an easy to use audio evaluation kit contains all the elements needed to evaluate the highly power-efficient MERUS digital input multilevel class D amplifier 2×80W (MA12070P).

The IC is specifically targeted for high-performance filter-less and heatsink-free audio applications and suitable for applications such as voice controlled audio and professional audio where it is essential to maximise dynamic range and audio performance while minimising power dissipation and power loss.

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