NXP Semiconductors of the Netherlands has started selling the "TFA9887", a Class D audio amplifier IC for small speakers that can increase output power by five times (English release). The company said, "The output power of the previous product was only 0.5W at most, but this IC can achieve an output power of 2.65W (nominal value when the power supply voltage is +3.6V and the load is connected to 4Ω), which is about five times the output power of the previous product." The high output power is achieved by introducing a method to prevent damage to small speakers, specifically, adaptive control, using a current detection amplifier to monitor the small speaker at all times and control the output signal within the safe operating range, which is achieved by integrating a DSP. The new product is mainly targeted at mobile phones, tablet terminals, personal computers, notebook computers, portable game consoles, portable navigation terminals (PNDs) and portable media players.
The power supply voltage of TFA9887 is +2.5~5.5V. Since a step-up DC-DC converter is integrated, even if the power supply voltage is reduced, it can be increased to the voltage level required to drive the D-class amplifier. The total harmonic distortion + noise (THD+N) is 0.03% (nominal value); the output noise voltage is 45μV (nominal value); the SN ratio is 97dB (nominal value); the power supply ripple rejection ratio (PSRR) is 90dB (nominal value); the audio signal input interface is two I2S interfaces; the supported sampling frequency is 8k~48kHz; the control interface is a 400kHz I2C bus.
The new product has a volume adjustment function, and is also equipped with overheat protection, overvoltage protection, low voltage protection, overcurrent protection, fraudulent data protection, etc. It uses a 29-terminal WLCSP package with a package area of 3.19mm×2.07mm; the operating temperature range is -40～+85℃; samples are now available, but the price is not disclosed.
Class D audio amplifier IC for small speakers that increases output power fivefold
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