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RT5509 Scheda tecnica(PDF) 26 Page - Richtek Technology Corporation |
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RT5509 Scheda tecnica(HTML) 26 Page - Richtek Technology Corporation |
26 / 58 page RT5509 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation www.richtek.com DS5509-00 August 2017 26 Boost Converter Current Sense ADC DAC Digital Control impedance & VREF IPEAK Isensed D VREF Figure 19. Boost Converter Schematic A built-in boost converter is used to adjust class-D supply voltage. This converter could be operated in 4 different modes which are : Disable Mode, in this case class-D is powered externally, boost converter is off. Battery Mode, VBST = VBAT, boost converter is powered, but MOS is switched to OFF state at all times. Fixed Mode, VBST = VBSTPG, VBAT is boosted to a certain value. Adaptive Mode, VBST depends on the level of signal The boost mode can be selected via BBMODE at register 0x14. When boost converter is powered and in Boost/Adaptive mode, it tries to regulate the output voltage VBST to a desired value. The switching frequency fSW is 2.048MHz (for fs = 8/12/16/24/32 kHz)/1.8816MHz (for fs = 11.025/22.05/44.1kHz). The digital control logic inside this converter collects VREF/load/VO information and then output a IPEAK value to general a proper D value which makes VO equals VREF. When in adaptive mode, boost converter can be used to generate required class-D power supply according to VBAT, TH1/TH2/TH3, THT1/THT2/THT3 and TOT where TH1/2/3, THT1/2/3 and TOT is at register 0x10 to 0x13.The detail function is shown below : 500us/1ms/2ms/4ms Figure 20. Illustration for Adaptive Boost Mode |
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