ST Microelectronics released a single-chip audio power amplifier that delivers 200 W, claimed to be the highest power available from an integrated commercial device. The STA5150 amplifier combines the patented BASH high-efficiency technology licensed from Indigo Manufacturing with ST's proprietary bipolar-CMOS-DMOS (BCD) process technology.
Merging the benefits of class AB and class D, the BASH technology uses DMOS power transistors operated in class AB mode, reducing the EMI and distortion typical of class D switching amplifiers. To maximise efficiency, by continually adjusting the power supply voltage, depending on the amplitude of the amplified audio signal, a constant voltage drop is achieved across the output transistors, completely independent of the output amplitude. Implementing this technique it can deliver 200 W into a 4 Ω load with less than 10% distortion, and with three times better efficiency than a conventional Class AB.
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