AWINIC AW8155B, Manual

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AW8155B
Jul. 2022 V1.3
www.awinic.com
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erate desired output by detecting the
“Crack” distortion of output signal, protects the speaker from damage at
high power levels and brings the most comfortable listening experience to the customers.
NCNOFF NCNON
Power Rail
NCNOFF NCNON
Power Rail
Crack Noise
Crack Noise
Figure 16.
NCN Function Diagram
Attack time
Attack time is the time it takes for the gain to be reduced once the audio signal exceeds the NCN threshold.
Fast attack times allow the NCN to react quickly and prevent transients such as symbol crashes from being
distorted. However, fast attack times can lead to volume pumping, where the gain reduction and release be-
comes noticeable, as the NCN cycles quickly. Slower attack times cause the NCN to ignore the fast transients,
and instead act upon longer, louder passages. Selecting an attack time that is too slow can lead to increased
distortion in the case of the No Clip function. Attack time is set 40ms~55ms in AW8155B.
Release time
Release time is the time it takes for the gain to return to its normal level once the audio signal returns below
the NCN threshold. A fast release time allows the NCN to react quickly to transients, preserving the original
dynamics of the audio source. However, similar to a fast attack time, a fast release time contributes to volume
pumping. A slow release time reduces the effect of volume pumping. Release time is set 0.9s~1.3s in
AW8155B.
Filter-Free Modulation Scheme
The AW8155B features a filter-free PWM architecture that reduces the LC filter of the traditional Class-D
amplifier, increasing efficiency, reducing board area consumption and system cost.
Pin-Compatible with AW8155(A), AW8145, no VREF capacitor
The AW8155B is pin compatible with AW8155(A) and AW8145.Without VREF 1 uF capacitor it can achieve
the same performance as AW8145, which make the PCB design more convenient.
EEE
The AW8155B features a unique Enhanced Emission Elimination (EEE) technology, that controls fast transi-
tion on the output, greatly reduces EMI over the full bandwidth.
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