XV-DV353
82
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7.1.10 CIRCUIT DESCRIPTION OF DIGITAL AMP. SECTION
AC IN
Filter
and
Volume
Timing
Control
Gate
Drive
XSD
To UCOM
PCM Signal
From
DVD or ADC
3.3V
0V
TAS5508BPAG
PWM Processor section
PWM Processor section
Power Stage section
Power Stage section
Output LPF section
TAS5122DCA
XOTW
Protection
PCM
→
PWM
Gate
Drive
20V
0V
0V
0V
The PCM signals output from the DVD decoder or AD converter are input to this section, and their volume and sound
quality are digitally adjusted. At the output stage, after conversion from PCM to PWM, the signals are output to the Power
stage.
In this section, timing is controlled so that the MOSFETs on the high and low sides will not be turned on simultaneously.
The voltage of the PWM signals are raised to drive the gates of the MOSFET, and the PWM signals to drive the speakers
are output from the MOSFET at the output stage. Detection and protection functions against short-circuiting of the output
signals and temperature exceeding the standard value are also provided.
Power Stage ICs No.
Protection Enable State
IC3201
SD_AB (23pin)
⇒
L
IC3301
SD_CD (24pin)
⇒
L
IC3401
OTW (25pin)
⇒
L
IC3101
IC3201, IC3301, IC3401
*1 XSD
: SD_AB (23pin), SD_CD (24pin)
*2 XOTW : OTW (25pin)
*1
*2
If the detection and protection work, the ports of the power stage ICs become the following state.
Negative Speaker Terminal
Ground (Chassis)
Do not short-circuit
LINE 1
VIDEO OUT
VIDEO OUT
AV CONNECTOR
LINE 1
AUDIO IN
LINE 2
R
L
SPEAKERS
R
FRONT
CENTER
SURROUND
SUB
WOOFER
R
L
L
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