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RT5508 Datasheet(PDF) 25 Page - Richtek Technology Corporation |
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RT5508 Datasheet(HTML) 25 Page - Richtek Technology Corporation |
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25 / 57 page  RT5508 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation DS5508-01 March 2017 www.richtek.com 25 Clip control is used to reduce current consumption when VBAT is low. It is defined by three parameters, VBCPS, CPSLP and MINCLS. The clip threshold is shown in Figure. The voltage sent to class-D is clipped when VBAT is lower than clip point (2.85V to 3.9V) which is set by VBCPS. The slope of clip threshold (Vo/VBAT) can be set by CPSLP from 2.5V/V to 3.4375V/V. A VO stop point (0, 2.5V, 3V, 3.5V) for clip threshold can be set via MINCLS. The output voltage drop will stops at this point. The clip threshold is calculated through following equation : BAT ClipThres = 5-(VBCPS-V ) CPSLP for clip threshold ≧ MINCLS ClipThres = MINCLS for clip threshold ≦ MINCLS After clip is done, a threshold is passed to speaker protection. Combined with speaker protection algorithm, a gain reduced procedure will be activated by speaker protection block and output signal is reduced to prevent clip. The detail function is shown below, the dropping rate of threshold can be set via CLIPDR at register 0x0B : CLIPDR old threshold new threshold CLIP Speaker protection gain reduced Figure 20. Clipper Gain Step Down The threshold is normalized to 1 is passed to speaker protection which equals to : BAT 5 - (VBCPS - V ) CPSLP ClipThres (normalized) = 5 ClipThres (normalized) equals to 1 if signal is small and never reaches to the threshold. When signal is large and is clipped by this threshold, ClipThres (normalized) will be sent to speaker protection block. If battery voltage returns to a hysteresis level, ClipThres will increase by a rate of CLIPRR to a certain level which is defined by VBCPS, CPSLP and VBAT. As ClipThres increases, speaker protection will also increase its gain to let the signal return to its original level. The battery voltage hysteresis can bet set via BVHYS at register 0x0B. VBAT (Thr) + BVHYS VBAT (Thr) CLIPRR ClipThres Figure 21. Clipper Gain Step Up |
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