Class D audio power amplifiers offer a combination of small size, low heat dissipation, high integration, and excellent sound quality. Coming in a compact 42-pin QFN package, the new MERUS MA5332MS from Infineon integrates a dual-channel PWM controller, a high-voltage gate driver, and four low RDS(on) MOSFETs. Thanks to its very low RDS(on) class D output stage (24.4mΩ typical), it can deliver 2x100W at 4Ω operating absolutely heatsink-free or 2x200W at 4Ω with a small 8°C/W heatsink. Compared to other single-chip solutions this is a considerably reduced size.
In the 100-400W/channel range, the MA5332MS is ideal for consumer products including all active speakers, soundbars, subwoofers, and mini-component systems, all the way to professional audio applications in active studio monitors, guitar amplifiers, aftermarket car, and marine audio amplifiers.
Audio developers will appreciate the fact that 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, the 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. Additionally, a new internal logic scheme to control soft-start operation delivers a further reduction of click and pop noise. Based on its improved features, MA5332MS reduces BOM cost and thermal management concerns, providing more space for the industrial design and delivering superior efficiency and low output distortion.
The MERUS MA5332MS class D audio amplifier multichip module can be ordered now in a PG-IQFN-42 package. Also available is the REF_MA5332BTLSPS reference board, a single BTL channel, 200W/ch (4Ω at 40V) class D audio power amplifier for home audio systems. It features a single BTL channel self-oscillating type PWM for the lowest component count, convenient single power supply and highest performance and robust design. The board demonstrates how to use the MA5332MS with a single power supply.
More information is available at www.infineon.com/ma5332ms and www.infineon.com/merus
www.infineon.com
