Silicon Laboratories introduces the Si824x family of isolated gate drivers designed for high-power Class D audio systems with output powers from 30W to 1000W. The new Si824x Class D audio driver features superior high-fidelity sound, powerful anti-jamming capability, and precise dead-time control for a wide range of digital audio applications, such as home entertainment systems, active speakers, Guitar amplifiers, public sound and outdoor speaker systems, alarms and car stereos.
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Class D amplifier solutions are not only used in low-power audio designs, but are now rapidly replacing Class AB amplifiers in high-power audio applications. As the high-fidelity market gradually adopts digital audio technology and high-performance standards, developers are designing energy-efficient “green†systems that, in addition to complying with Energy Star specifications, need to reduce bills of materials and display superior audio. Performance, Silicon Labs' Si824x audio driver provides the best solution for these emerging high-power Class D audio designs.
The high-power Class D design of the digital signal must accurately control the "dead time" during turn-off and turn-on to achieve optimal performance. Too short a dead time can result in wasted power, and too long can cause a high total harmonic distortion (THD). High-fidelity sound systems require ultra-low total harmonic distortion, so it's important to properly control dead time. Compared to other audio drivers that have limited ability to adjust dead time, the Si824x supports precise dead time control based on external resistor values. Developers can adjust the dead time by simply modifying the resistor value, making it easy to meet a variety of audio design requirements.
Based on Silicon Labs' proven digital isolation technology, the Si824x audio driver provides high voltage isolation of up to 2.5 kV between input and output, enabling inputs driven by low voltage Class D control signals to drive high voltage, high current outputs. Terminal transistor. The input/output is isolated to prevent sensitive signals from being disturbed by noise and transient power. By isolating the high/low-side outputs from each other, the drive voltage can be as high as 1500 V, making the Si824x components meet the requirements of high-power audio.
By isolating the input/output, the Si824x architecture offers the advantage of built-in level shifting. The isolated architecture of the gate driver allows the audio system to seamlessly interface high voltage power to low voltage DSP/modulators without any additional material costs. In addition, the Si824x can choose any voltage power, unlike other drivers that require expensive DC blocking capacitors.
Designed to operate in a noisy environment, the Si824x driver itself is immune to transient power supplies and is immune to destructive "latch-up" conditions. This built-in latch immunity increases operational reliability and reduces bill of materials costs. To protect the drive components from latch-up conditions, some audio driver designs based on other audio drivers contain up to 20 discrete components.
Diwakar Vishakhadatta, director of silicon Labs isolation product line, said, "The Si824x family offers significant advantages over existing audio driver solutions. It sets a new standard for high fidelity performance for high fidelity Class D audio designs. The Si824x family includes Digital isolation, precise control of dead time to reduce total harmonic distortion, and protection against latch-up and noise interference make the Si824x family the best solution for high-power Class D audio applications."
In addition to the new Si824x audio driver, Silicon Labs also offers a wide range of audio components, including multi-frequency receivers, RDS data receivers, FM receivers and FM transmitters, as well as recently introduced for low power (below 5W) A Si270x Class D amplifier that effectively suppresses electromagnetic interference.
Price and availability
Samples and pre-samples of the Si824x Class D audio driver are available now in a 16-pin SOIC narrow package. At 10,000 purchases, the Si824x starts at $1.82. Silicon Labs offers a full-featured Si824xClassD-KIT evaluation board to simplify application development and is priced at $250.
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