PSU

Advanced Class D Amplifier USP’S
Architecture based upon Class D Ltd Proprietary Design - and used in conjunction with ACD 2005-1 Full Custom Power Supply chip.

1.	The ACDTM amplifier employs a proprietary, advanced, high resolution sampling technique, avoiding the use of DSP and results in extremely high sonic quality and very low noise floor in excess of 100dB at low cost. The solution is a low component count, low cost, easy to use solution for Home Theatre, Hi-Fi, Pro Audio, PA, and In-car applications. ACDTM easily competes in sound performance and annihilates the cost involved with DSP products on the market today. From an engineering perspective the product is simple to understand and implement, can be brought to market in days rather than months and avoids the complex world of programming and software which bedevils DSP implementation.

2.	The technique allows multiple high power amplifiers and power supplies to operate together with no form of cross talk or interference. It is extremely difficult to achieve this using DSP at high power levels without causing overheating, severe RFI generation and audio degradation.

3.	DSP employs leading edge semiconductor technology using tiny gates to achieve the speed of signal processing required. The supply voltages are between 1.5 and 5 volts depending on the precise generation of the chip process. This makes them very susceptible to interference and damage when combined with high power output stages. The ACDTM technique avoids these problems entirely.

4.	The marketplace today, especially in Home Theatre and surround sound applications is looking for more power and the spectacular effects generated by full, powerful surround sound, which requires multiple channel functionality. The ACDTM technique combined with the ACD 2005-1 power supply chip allows this to be easily and economically achieved. Moreover this combination, with its inherent low loss, energy saving properties, allows high power, high performance, multiple channel audio to be integrated into small volume enclosures such as set top boxes, DVD players, home theatre, games boxes and active loudspeakers.

5.	In the ACDTM Class–D amplifier, the ACD 2005-1 enables a number of unique methods of operation to be easily accomplished: Firstly, in audio applications complete shutdown during periods of silence results in the complete elimination of background noise, even at high volume settings. Secondly, the enable/disable function of ACD 2005-1 instantaneously controls both the power supply and the amplifier for short circuit, over temperature, over current and DC on the output. This is aimed mainly at the Pro Audio market where abuse of PA equipment is the norm.

6.	A requirement of Class D amplifiers is that the modulation depth must be limited to below 100% to avoid destruction. ACDTM automatically achieves this.