DEH-P8MP/XN/UC
82
1
2
3
4
1
2
3
4
C
D
F
A
B
E
7.3.2 CIRCUIT DESCRIPTIONS
BACKUP 10A
14.4V
VCC2(CH3,4) 17.5V
VCC1(CH1,2) 17.5V
14.4V
ACC 10A
DRIVER
DC/DC CONVERTER 2
for ACC
MOSFET60
4CH POWER AMP
DC/DC CONVERTER
DRIVER
GND
-
Power Amp Secsion
IC201
PAL008A
IC241
UPC494GS
DC/DC CONVERTER 1
for BACKUP
-
DC/DC converter 1
VOLTAGE
DIVIDER
ERROR AMP
TRIANGULAR
WAVE OSCILLATOR
COMPARATOR
Power AMP
DC/DC
CONVERTOR 1
VCC1
BATTERY
VOLTAGE
REFERENCE
VOLTAGE
PULSE
OUTPUT
VOLTAGE
BOOSTER
RECTIFICATION
CIRCUIT
IC201 PAL008A
IC201 incorporates a 4channel power amplifier and a DC/DC converter driver. Current for channels 1 and 2 is
supplied from the BACKUP power supply and current for channels 3 and 4 from the ACC power supply.
This is because when current is supplied with voltage increase in the BACKUP power supply as it is done
conventionally, 10A which is the limit to the vehicle fuse is exceeded.
Thus ACC power supply was enabled to supply current so that there are two power supplies of BACUP and
ACC and output of 60W x 4channel is expressed. Increased voltage (VCC1, VCC2) is controlled individually by
separate DC/DC converters. Therefore, different voltages occur when there is difference between the outputs
from L channel and R channel. A diode was hence connected between VCC1 and VCC2 so that voltage difference
will not occur.
Only one DC/DC converter driver is incorporated in IC201. Therefore, another DC/DC converter driver was
prepared externally to be synchronized with the DC/DC converter driver for IC201 and eliminate noise.
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