In an effort to improve the sound quality and increase the volume, manufacturers increase the voltage to the miniature transmitters to be installed in mobile devices. First, it was increased from 3.3 to 5, and in recent years - and up to 8 V. At last this week, the Mobile World Congress 2013 the company introduced the NXP Semiconductors TFA9890 chip with built-in DC-DC converters, an unprecedented increase in voltage to 9 , 5 V.
Increasing the voltage prevents amplifier clipping and retains high-quality sound at maximum volume.Being the most powerful driver for miniature speaker, TFA9890 provides a peak power of 4 W with a standard radiator with impedance of 8 ohms, which is generally about 0.5 Watts.
In TFA9890 loudspeaker features protection to prevent injury when working at high power. In contrast to the traditional approach based on limiting the pass, TFA9890 measures the current and voltage at the speaker, adjusting its settings to the measurement results. As stated, it allows to take into account the actual conditions, such as the aging of the radiator, the casing is damaged and blocked acoustic ports.
The application areas TFA9890 called mobile phones, tablets, TVs and portable speakers.
Currently available study samples of new items. Deliveries TFA9890 begin in the second quarter of 2013.
Source: NXP Semiconductors
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