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RT5509 Scheda tecnica(PDF) 26 Page - Richtek Technology Corporation

Il numero della parte RT5509
Spiegazioni elettronici  Speaker Amplifier with Speaker Protection
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Produttore elettronici  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

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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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