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Revolutionary New Audio Amplifier IC Delivering 5 Times the Power to Micro Speakers


NXP’s TFA9887 to bring a new generation of louder, more reliable mobile devices with better sound quality


“Digital natives have come of age taking poor mobile sound quality for granted. As speakers have become smaller, the quiet, tinny sound we've come to associate with mobile devices has got even worse,” said Shawn Scarlett, director of marketing, mobile audio product line, NXP Semiconductors. “Our new audio system transforms the listening experience, enabling louder, richer sound quality from virtually any mobile device. The improvement is so striking that consumers, handset makers and operators will immediately hear the difference.”

No Need to Cut Bass Frequencies
Speaker makers have to balance competing demands for good sound, small size and reliability. As micro speakers have shrunk, phone, media player and tablet designers have been forced to limit output power and sound quality. Amplifiers could easily deliver enough power to destroy the speaker at one frequency, while under-powering it at others. Until now, it has been impossible for system designers to know for sure when it was safe to apply extra power. The rule has therefore been to cut out bass frequencies and limit output power to avoid blowing the speaker - a common cause of failures in mobiles.

TFA9887 High Performance Audio Amplifier IC
Designed for use with an external power switch, the SSL2109 LED driver IC provides a single design platform for 100V, 120V and 230V mains input voltages and power ranges up to 25 W. By offering a controller-only version of the popular SSL2108x family, the SSL2109 provides LED retrofit lamp and driver module manufacturers with the flexibility to optimize external MOSFET selection based on cost, performance and heat dissipation, also across different power levels.

Based on GreenChip™ technology, the SSL2109 offers best-in-class efficiency up to 95%; a high level of integration, with only 15 components required for a full application; a small PCB area enabling compact designs; and a very low electronic bill of materials (BoM).

“By bringing down the cost of LEDs, leading lighting manufacturers are accelerating their adoption in the residential and commercial lighting markets. The SSL2109 LED controller IC offers a very low electronic bill of materials for high-efficiency LED driver applications, a very low cost of design, and flexibility in optimizing external MOSFET selection across an extremely wide range of power levels, also with cost in mind,” said Ryan Zahn, general manager, lighting solutions product line, NXP Semiconductors.

TFA9887 Speaker Protection By incorporating circuits that monitor speaker performance and prevent damage, the NXP TFA9887 IC allows designers to break this rule. Adaptive excursion control measures the actual excursion of the speaker membrane to ensure that it never exceeds its rated limit. Real-time temperature protection measures the voice-coil temperature directly to prevent thermal damage.

Boosting Audio Performance
Because the speaker is fully protected, the system can deliver significant levels of extra power to make the sound louder and better than before. The TFA9887 optimizes the audio signal based on the movement of the speaker, something no other system is capable of, using the full capabilities of the speaker without pushing beyond the limits. An advanced clip avoidance algorithm monitors audio performance and prevents clipping, even when the power supply begins to sag. Bandwidth extension increases the low frequency response well below speaker resonance. And an intelligent DC-to-DC boost converter maximizes audio headroom from any supply level despite battery undervoltage. The TFA9887 automatically adapts to any changes in the speaker - including ageing, damage to the enclosure, and blocked speaker ports - helping to optimize performance and maintain the desired sound quality.

The entire system is integrated into a single chip with digital interfaces for portable devices. The IC incorporates NXP's CoolFlux audio DSP, a high-efficiency class-D amplifier with current sensing, and a DC-to-DC boost converter. The advanced, embedded algorithms require no separate licensing. Additional tools allow designers to customize audio sound quality and choose how to optimize mobile device performance.


The company's Web site address is www.nxp.com
[Reprinted with kind permission from NXP]