EPC has used GaN transistors to create a high-power Class-D two-channel audio power amplifier design. Instantiated in evaluation kit EPC9192, it is capable of pushing 700W/channel into 4Ω (or 2Ω) or 350W/channel into 8Ω. Bridging the two channels results in 1.4kW drive into 4 to 8Ω. Key components, per channel, are a pair of 200V EPC2307 GaN transistors on a ...
Class-D audio amplifiers are power efficient, but do not beat, or even match, well-designed Class-AB and Class-A amplifiers on many other specs. This said, Delft University of Technology, working with Goodix Technology, seems to have got right up amongst the hi-fi numbers with a 0.18μm BCD prototype IC that achieves 120.9dB dynamic range and -111.2dB peak THD+N. At full power ...
STMicroelectronics has created a pair of 10W Class-D audio amplifiers for use in vehicles “for automotive applications like eCall, telematics and wherever an audio channel needs to reproduce human voice, music or warning messages “, it said. They are almost identical, both offering a digital (I2S) front end, digital core, 24bit DAC (100dB resolution), a Class-D trans-resistance PWM output stage ...
Infineon has created a 7 x 7mm multi-chip module that can deliver two audio channels of up to 100W each. Called MA5332MS, the company claims 95% power efficiency for the Class-D amplifier when driving that power into 4Ω loads (10% THD+N, ±36.5V supply). Looking at the data sheet, up to 90W is available with <0.1% THD+N. Providing the load is 1W, THD+N ...
Diodes has introduced a digital stereo audio amplifier with built-in boost converter that allows 8+8W to be delivered from one Li-ion cell and 12+12W from two cells in series. Called PAM8965, more detailed figures are: One cell (Vbatt = 3.7V) 8W/channel at 10% THD+N (6Ω load 1kHz) 6.4W/channel at 1% THD+N (6Ω load 1kHz) 20mA quiescent 700nA shutdown Two cells ...
Sumida is aiming at filtering in digital audio amplifiers with a series of shielded high-power inductors. Called DEP1623 and measuring ~27 x 17 x 23mm, “this inductor is wound by flat wire and assembled with the Mn-Zn ferrite core. It is typically used in digital amplifier filters in home theatre and large LCDs”, according to distributor New Yorker Electronics, which ...
HFDA801A is a 2MHz PWM Class-D audio amplifier with four bridge outputs from STMicroelectronics. High quality sound is claimed by the company: “With a signal-to-noise ratio of 121dB, 120dB dynamic range and only 10μV output noise, the HFDA801A delivers an extraordinary level of audio performance.” Distortion is typically 0.02% at 1W 1kHz into 4Ω or 2Ω, or 0.08% across 20 – ...
STMicroelectronics has tied up with Japanese audio company Alps Alpine to create an automotive class-D audio amplifier IC. Called FDA901, “the chip aims to contribute to the creation of multi-function, high-fidelity car audio systems that fuse the high efficiency of class-D amplifiers with the high-quality sound of ST’s class-AB amplifiers”, according to ST. According to ST it features low residual noise, ...
Infineon is claiming efficiency and audio quality benefits for multi-level Class-D audio amplification. At the heart of the power issue is the amount of energy wasted when switching outputs rail-to-rail when only low audio volumes are required. Branding its multi-level products Merus, “Infineon is the first company to apply multi-level switching technology to class D audio amplifier products, improving amplifier parameters ...
Diodes introduces a 10+10W stereo Class-D audio amplifier with an anti-clipping circuit to avoid distortion at high volume settings
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