Infineon‘s class D audio power amplifier has the advantages of small size, low heating, high integration and high-definition sound quality. By releasing the great potential of Infineon‘s leading power MOSFET technology, Infineon Technology Co., Ltd. launched merus ™ Dual channel, analog input class D audio amplifier multi chip module (MCM) ma5332ms. Ma5332ms has been comprehensively upgraded on the basis of the previous generation products, which can provide the same or even higher output power as the single-chip audio amplifier, and does not need heat sink, reducing the board area by 50%. In the power range of 100w-400w per channel, ma5332ms is an ideal choice for consumer electronics products such as home theater systems, bar speakers, subwoofers and mini sound systems. It is also suitable for professional applications such as active speakers, active studio monitoring controllers, guitar speakers, car audio retrofitting and marine audio amplifiers.

Ma5332ms adopts a 42 pin QFN package with a size of 7mm x 7mm. In a small package, it integrates a dual channel PWM controller, a high-voltage gate driver and four low on resistance (RDS (on)) MOSFETs. Since the on resistance of the output stage of class D audio amplifier is extremely low (typical value: 24.4 m Ω), the ma5332ms can provide 2 x 100 W constant power for a 4 Ω load without heat sink; In the case of using a small 8 ° C / w heat sink, a constant power of 2 x 200 W can be provided for a load of 4 Ω. Compared with other single-chip solutions, the size is significantly reduced. The ma5332ms can provide differential or single ended input and multiple output configuration options - single ended (2x SE), bridged load (BTL) and parallel single ended (PSE), and supports dual power supply or single power supply. Replacing BTL structure with Se structure can reduce bus capacitor and output low-pass filter.

As a highly integrated multi chip module, ma5332ms also provides overcurrent, overtemperature and undervoltage protection circuits with self resetting function. This protection circuit based on system on chip can save time without using external components to design the protection circuit. In addition, the new internal logic control method to control the soft start operation further reduces click noise. Thanks to the improvement of functions, ma5332ms can reduce BOM costs and heat dissipation requirements, bring more space for industrial design, and achieve excellent efficiency and low output distortion.