Infineon introduces MERUS class D audio amplifier multichip module

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Infineon Technologies has introduced the MERUS 2-channel, analogue input, class D audio amplifier multichip module (MCM) MA5332MS.

Class D audio power amplifiers offer a combination of small size, low heat dissipation, high integration, and improved sound quality.

This new module is a powerful upgrade to its predecessor, according to Infineon, offering the same or even higher output power than monolithic alternatives, without a heatsink and 50 percent less footprint. In the 100-400 W/channel range, the MA5332MS is intended for consumer products including home theatres in a box, soundbars, subwoofers, and mini-component systems. It is also well suited for professional applications like active speakers, active studio monitors, guitar amplifiers, aftermarket car, and marine audio amplifiers.

Coming in a compact 7 x 7 mm 2 42-pin QFN package, the MA5332MS integrates a dual-channel PWM controller, a high-voltage gate driver, and four low R DS(ON) MOSFETs. Due to its very low R DS(on) class D output stage (24.4 mΩ typical), it can deliver 2 x 100W at 4 Ω operating absolutely heatsink-free or 2 x 200W at 4 Ω with a small 8°C/W heatsink.

Compared to other single-chip solutions this is a significant reduction in size.

The MA5332MS offers differential or single-ended input and multiple output configuration options, single-ended (2x SE), bridge-tied load (BTL), and parallel single-ended (PSE), using a single or split power supply. Enabling an SE topology as an alternative to BTL allows for reduced bus capacitors and output low-pass filters.

As a highly-integrated MCM, MA5332MS also integrates protection circuitry for functions such as over-current, over-temperature, and under-voltage protection with self-reset capability. This on-chip protection circuitry saves the time to design protection using external protection components.

In addition, a new internal logic scheme to control soft-start operation delivers a further reduction of click and pop noise. Based on these improved features the MA5332MS reduces BOM cost and simplifies thermal management, providing more space for a design as well as delivering greater efficiency and low output distortion.