Yamaha Portable Grand DGX-630 Service Manual page 27

I IC BLOCK DIAGRAM（IC ブロック図）
SN74LV08APWR (X4463A00)
Quad 2 Input AND
DM: IC13
1A
1 14
1B
2 13
1Y
3 12
2A
4 11
2B
5 10
2Y
6 9
VSS
7 8
NJM4580E(TE2) (X2331A0R)
Dual Operational Amplifier
DM: IC16
Output A 1 +V 8
Inverting
2 7
Input A
- +
Non-Inverting
3 6
+ -
Input A
-DC Voltage Supply 4 -V 5
MC34063EBD-TR (X7371A00)
DC-DC Converter
DM: IC19
Drive
8
Collector
S Q
R
100
I pk
7
Sense
I pk
Oscillator C T
V CC
6
Comparator
1.25 V
+
Reference
±
Regulator
Comparator
5
Inverting
Input
SN74LV14APWR (X6688A0R)
Hex Inverter
DM: IC20
VDD
1A
4B
1Y
4A
2A
4Y
2Y
3B
3A
3A
3Y
3Y
GND
R5520H001B-T1-F (X7569A00)
USB High-Side Power Switch
DM: IC18
+DC Voltage
EN
1
Supply
GND
Output B 2
Inverting
3
FLG
Input B
Non-Inverting
Input B
LA4625 (XY209A0R)
Power Amplifier 13.5W
AM: IC201
Switch
1
Collector
Q2
Q1
Switch
2
Emitter
PRE-GND
Timing
3
Capacitor
4
Gnd
1 14 VDD
6A
2 13
6Y
3 12
4 11 5A
5Y
5 10
4A
6 9
7 8 4Y
IN 4
5 OUT
4
IN
EN 1
DC
2
RIPPLE
FILTER
PREDRIVER POWER
IN1 1
+
IN
-
PREDRIVER POWER
3 OVER VOLTAGE/
BIAS
CIRCUIT SURGE
THERMAL
STBY 4 STANDBY
SW
SHUT DOWN
PREDRIVER POWER
IN2
6 +
LOAD SHORT
IN
-
PROTECTOR
PREDRIVER POWER
POP NOISE
PREVENTION
CIRCUIT
5 7
ON TIME POP
DGX-630/YPG-635
SN74AHCT1G08DCKR (X0158A0R)
Single 2-Input Positive-AND Gate
DM: IC12,15
A 1 Vcc
5
2
B
3 4
GND Y
FUNCTION TABLE
INPUTS OUTPUT
A B Y
H H H
L X L
X L L
GATE CURRENT
CONTROL LIMIT
FLAG
DELAY
UVLO
THERMAL
SHUTDOWN
V
CC
14
OUTPUT PIN TO V
CC
SHORT PROTECTOR
-OUT1
13
LOAD SHORT POWER
12 PWR-GND1
PROTECTOR GND1
+OUT1
11
OUTPUT PIN TO GND
SHORT PROTECTOR
V
CC
OUTPUT PIN TO GND
SHORT PROTECTOR
-OUT2
9
POWER
10 PWR-GND2
GND2
+OUT2
8
OUTPUT PIN TO V
CC
SHORT PROTECTOR
5 OUT
FLG
3
2
GND
27