Class D audio amplifiers can operate at an efficiency level of around 90%, allowing designers to use small heat sinks or provide extremely high audio output without heat sinks. It has gradually become the preferred topology for high-end home A / V equipment and mobile devices, and can help designers achieve a combination of high performance and small size, which is what users around the world expect and need.
Now, the emergence of highly integrated Class-D amplifier devices, including the entire amplifier module in a single package, allows companies to bring new products with extremely competitive prices to the market faster, and their audio performance meets or exceeds traditional analog Amplifier. Therefore, the market for Class D audio amplifiers has advanced by leaps and bounds in the past decade, and the compound annual growth rate is much higher than that of special audio devices.
Diodes: smaller space, higher power
The growth of the market has attracted many start-up companies and investors, including Diodes, the world's leading discrete, logic and analog semiconductor manufacturer and supplier that received Longding Microelectronics two years ago. Longding Microelectronics was in Class D audio There is an innovative design technology in the field of amplifiers, namely "filter-free" digital audio amplifiers. After the acquisition, Diodes has continuously launched a new generation of high-efficiency, space-saving product designs and expanded its product lineup.
Diodes newly launched two high-efficiency low-noise 3W mono Class D audio amplifiers
Recently, Diodes has launched two new high-efficiency and low-noise 3W mono Class D audio amplifiers PAM8013 and PAM8015. Both products are packaged in a super tiny QFN1515-9L package with a size of only 1.5mmx1.5mmx0.75mm to support MP3 The miniaturization and special design of portable products such as players, tablets and smart phones. They provide two different pin options to simplify circuit board wiring to meet different design requirements. This series of amplifiers uses an output structure that does not require an external LC filter, thereby reducing the number of external components and reducing the PCB area.
The two amplifiers use a differential input mode to ensure low noise performance, high power supply rejection ratio, and good total harmonic distortion characteristics. When powered by a 5V power supply, they can provide up to 3W of continuous output power capability for 4Ω loads.
The new device can guarantee a power supply voltage range of 2.8V to 5.5V, thus supporting a variety of different battery configurations. Their output efficiency is as high as 90%, and the shutdown current is less than 1μA, which helps to better extend the battery life of the system. In order to prevent harmful circuit overload, the two amplifiers integrate protection circuits such as short-circuit protection, over-temperature protection, and under-voltage lockout circuit with self-recovery function.
Earlier this year, Diodes also introduced the PAM8320 20W mono Class D audio amplifier, which uses SOP16 exposed pad surface mount packages, effectively saving space. The working efficiency of the new device is as high as 95%, and the external heat sink can be omitted, thereby saving system space and reducing the bill of materials cost.
The low-impedance drive capability of this amplifier can provide 20W of power to 4Ω bridged load speakers, and is suitable for small high-power speakers in a variety of wireless headphones, personal computers, and docking station products. PAM8320 provides a wide supply voltage range from 4.5V to 15V, and is suitable for consumer audio systems driven by batteries and grid power supplies.
STMicroelectronics: Improving the audio experience in cars
Last quarter, STMicroelectronics introduced the first all-digital Class D audio automotive power amplifier with an all-digital architecture, including digital inputs and a powerful diagnostic processor, which helps minimize noise and save up to 50% of materials The cost, so that the car audio host and power amplifier have the high energy efficiency advantages of class D amplifiers.
FDA2100LV's all-digital amplifier architecture has built-in low-emission function, floating-point digital core, anti-transconductance circuit, and slope control to minimize tuner interference, improve mobile phone RF interference protection performance, and simplify EN55025, ISO11452-2 (2004) and other automobiles EMC compliance issues. In addition, ST's unique patented design of the output filter-based feedback loop optimizes system performance, such as electromagnetic interference (EMIe), harmonic distortion (THD), and frequency response. This means that even using low-cost external components can achieve high sound quality performance. The same design can drive four different speaker impedances, for example, 8Ω, 4Ω, 2Ω, or 1Ω.
STMicroelectronics claims that FDA2100LV belongs to the all-digital power amplifier product series that makes drivers all over the world excited, and can bring more flexibility to designers. The new series of products can be used to develop 2, 4 or 6 channel configurations. As the market's first digital input automotive Class D power amplifier series, these digital amplifiers can be connected to digital audio processors without noise, without the need for digital-to-analog converters (DACs) or input filters.
Other important features include full digital I2C control and reliable and advanced digital diagnostic functions, up to 110dB signal-to-noise ratio and 108dB dynamic range. The start-stop compatible system ensures that the music playback will not be distorted or interrupted even if the battery voltage drops suddenly when the engine is started. It is suitable for various traditional models, hybrid or pure electric vehicles.
International Rectifier: Turnkey Solution
Recently, the international rectifier company IR launched a new class D audio chipset, which contains the IRS20965 digital audio driver IC, which can provide protected pulse width modulation (PWM) switches and complete audio MOSFETs, designed for high-performance class D audio amplifier products Make optimization.
By simplifying the acquisition of a new generation of turnkey Class D chip amplifiers, these reference designs can help designers overcome heat dissipation challenges in products suitable for home theaters and televisions, audio extensions, active speakers, musical instruments, and aftermarket automotive systems, Set a new standard for miniaturization within a wide rated audio output power range. Using this method, designers can ensure that each project is completed within a reasonable time window to achieve the specified audio quality goals, while also setting new standards for product miniaturization and achieving very competitive prices.
IRS20965 has high-side and low-side independent floating pulse width modulation input, which can control the dead time from the external pulse width modulation controller. The new IC's anti-breakdown logic provides additional protection in the event of a pulse width modulation controller failure. The product also has overcurrent detection output and 2A gate drive output capability.
Pan Dawei, vice president of sales for IR Asia Pacific, said: "The new chipset is equipped with the IRS20965 digital audio driver IC, which makes the external controller with programming performance and protection functions more flexible. For example, while the new product provides non-shutdown overload protection, it also Can maintain high-quality audio performance. "
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