Clean power controller for audio hi fi and sound imaging
The BD372xx series are the first audio power supply ICs to combine leading-edge analogue and sound reproduction technologies. In addition to integrating a newly developed fast response error amp circuit and low-noise architecture, multiple parameters that affect audio quality were optimised through real-world listening tests. This provides high performance in all key characteristics of voltage stability, noise level, and power supply symmetry for power supplies dwesigns in audio equipment.
The power supplied to audio equipment has a significant effect on sound quality, so the power supply controler plays an important role in supplying clean power with minimal voltage fluctuation and noise. Providing clean power involves optimizing three key characteristics: voltage stability, noise level, and symmetry between positive and negative power supplies. This is needed for more accurate sound reproduction as well as more accurate sound imaging (location and distance of sound source) and resolution (realism and depth).
Incorporating a newly developed error amp circuit capable of high-speed response over a wide band minimises the effects of input voltage/output current fluctuations on the output voltage. This provides more faithful reproduction at the lower (bass) frequencies. A low-noise architecture suppresses noise generated within the IC at 4.6µVrms, 50x lower than traditional devices. This eliminates the influence of noise to deliver clearer sound.
The controller supports positive power supplies but a negative type is also offered that can be configured to achieve ideal symmetry in characteristics when used together. This makes it possible to improve sound image localization and expand the sound stage. The BD37201NUX is aimed at low-voltage digital devices such as DACs and DSPs, while the BD37210MUV (positive power supply) and BD37215MUV (negative power supply) are optimised for analogue devices (i.e. sound processors, current-voltage conversion amps) that operate using both positive and negative voltage supplies.
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