Product category:
Reference Designs
News Release from: Zetex | Subject: ZXCDSUBEV
Edited by the Electronicstalk Editorial
Team on 10 January 2007
Subwoofer design boasts flat frequency
response
Class D amplifier reference design claims new benchmarks in subwoofer performance, power and cost.
Zetex Semiconductors has announced a series of subwoofer amplifier reference designs using a unique feedback architecture to minimise distortion and noise and achieve the high damping factors required for tight bass control Based around the ZXCD Series of Class D modulator ICs, the ZXCDSUBEV closed loop designs have proved capable of producing a damping factor as high as 285 and a total harmonic distortion plus noise (THD+N) figure better than 0.05% with a flat frequency response set ideally for subwoofer applications
This article was originally published on Electronicstalk on 24 Jul 2008 at 8.00am (UK)
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By taking its feedback signal from the filtered amplifier output, these high gain circuit designs compensate for any bridge mismatches and filter nonlinearities to attain a guaranteed reduction in distortion across the entire power band.
The feedback also ensures an excellent power supply rejection ratio, allowing the subwoofer amplifier circuits to operate well with unregulated linear power supplies.
In addition, the circuits are very tolerant of high off-load voltages.
90% efficiency and power levels up to 500W and beyond provides the ZXCDSUBEV series with the necessary headroom to maximise the impact of the dynamics of many movie sound tracks.
Subwoofer manufacturers have a choice of single-ended and bridge tied load architectures with initial options producing output power levels of 150, 250 and 500W into 4ohm.
In addition, the scalability of the design means that higher powers are easily produced from this single cost effective platform.
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