Micro speakers amplifier integrates dynamic speaker management
The boosted, digital Class D DSM smart amplifier unleashes a system’s full audio potential by safely driving higher power levels (up to 5.1W) into tiny speakers typically rated for much lower power between 1 to 3W. As speakers shrink, loudness or sound pressure level (SPL) decreases while the resonant frequency increases, leading to less bass. Driving the speakers harder to increase loudness and bass response can easily damage the micro speakers through overheating and over excursion. MAX98390 solves this challenge by utilizing integrated IV (current and voltage) sense and Maxim’s DSM algorithm to drive speakers to their maximum specified limits, while protecting against over excursion and over-temperature events. DSM’s excursion protection enables designers to drive speakers to their specified excursion limits, producing sound up to two octaves below the resonant frequency limit.
To properly protect the speaker, amplifier algorithms must know the characteristics of the speaker, such as resonant frequency within its enclosure, excursion limit and voice coil thermal limit. Traditionally, designers had to go through the time-consuming and complex characterization process or rely on direct supplier support to characterize their speakers and enclosures. The MAX98390 significantly reduces the design time through the easy-to-use DSM Sound Studio GUI that allows customers to quickly and easily characterize many speakers. Combined with DSM’s thermal protection, the result is maximum loudness across the significantly extended frequency ranges in minutes, with no complex programming required.
The chip offers industry-leading peak efficiency at 86 percent, which is even further improved with DSM’s Perceptual Power Reduction (PPR) feature that can yield up to an additional 25 percent efficiency, making it well suited for low power devices that need longer battery life.
Maxim Integrated – www.maximintegrated.com
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
