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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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RT5509 Datenblatt(PDF) 23 Page - Richtek Technology Corporation |
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RT5509 Datenblatt(HTML) 23 Page - Richtek Technology Corporation |
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23 / 58 page  RT5509 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation DS5509-00 August 2017 www.richtek.com 23 Gain DnFlag DnFlag==1 ?? ALC_period expired?? ALC_period expired?? yes no yes no yes sPeak>sThres || xPeak>xThres || DCR>rThres ?? yes no Gain = ALCInitGain PWDN/SUSPD/Off/F ault/Mute /SilenceReset PWDN/SUSPD/Off/F ault/Mute /SilenceReset DnFlag = 0 Figure 17. Gain Generation for ALC Gain Limiter The signal and excursion is limited to ensure the signal is not clipped, and the excursion never growth over the maximum allowable value. The gain required to limit the signal and excursion are calculated by : Lmt sThres xThres G = min , ,1 sPeak xPeak The parameters for Limiter control : sThresLmt : Threshold of signal, specified by 0 to 1. 1 corresponds to the maximum allowable signal specified by clipper module. xThresLmt : Threshold of excursion, specified by 0 to 1. 1 corresponds to the maximum allowable excursion. xThresLmtDamage : Threshold of excursion when either resistance or excursion damage is detected. DC Resistance Control Loop DC Resistance Measurement Metal coil resistance is highly linear dependent on the temperature, for example the scale factor is +0.393%/C for copper. The coil resistance is online monitored by the speaker protection algorithm. The update is disabled at PWDN/SUSPD/Off/Fault/Mute mode. A register bit can be set to define if the DC resistance is monitored or not in Silence mode. The parameters for Coil Resistance : RNML : Nominal resistance of coil ( ) rApp : The application resistance between amplifier and the loudspeaker, normalized to RNML. The application resistance is assumed to be constant through all time. PI Control Loop : The parameters for PI-control loop : |
Ähnliche Teilenummer - RT5509 |
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Ähnliche Beschreibung - RT5509 |
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