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Zetex has recently successfully introduced 500W RMS into the 4? analog input Class D reference design, reducing the total harmonic distortion and noise (THD+N) parameters to less than 0.05% and power up to 90% of 1W, creating a new subwoofer amplifier. Audio performance standards. The new design is supported by the single-channel evaluation board ZXCD500MOEVAL, which significantly reduces the cost and size of the amplifier.
Based on the Acoustar ZXCD1000 regulator IC, the new 500W conversion amplifier's unique feedback structure helps reduce distortion and deliver outstanding audio characteristics. This high-gain circuit design utilizes a filtered amplifier output feedback signal to help compensate for bridge mismatch, power supply fluctuations, and filter nonlinearities, reducing total harmonic distortion and noise throughout the power band.
Another advantage of the circuit feedback structure is that it greatly reduces the output impedance of the amplifier and produces a damping factor greater than 285, which is typically only available with Class AB linear amplifiers.
The reference design includes a mute/soft-start circuit that uses the momentary switch and the suppression of the start-up sound to create the perfect output mute effect. In addition, the under-voltage monitoring circuit is designed to prevent sounds from being emitted when power is lost. The Zetex solution has a noise figure set at -130dB, a DNR of 98.5dB, and a frequency fluctuation range of 10Hz to 250Hz.
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