Ic Block Diagram - Yamaha PSR-S550 Service Manual

PSR-S550/PSR-S550B

■ IC BLOCK DIAGRAM

SN74LV08APWR (X4463A00)
DM: IC13
SN74AHCT08PWR (X3824A00)
DM: IC24
Quad 2 Input AND
1A
1
1B
2
1Y
3
2A
4
2B
5
2Y
6
VSS
7
LA4625 (XY209A0R)
Power Amplifier 13.5W
AM: IC201
IN1 1
PRE-GND
3
STBY 4
IN2
6
POP NOISE
PREVENTION
CIRCUIT
ON TIME
R5520H001B-T1-F (X7569A00)
USB High-Side Power Switch
DM: IC18
EN
1
GND
2
3
FLG
20
SN74LV14APWR (X6688A0R)
Hex Inverter
DM: IC20
VDD
14
4B
13
4A
12
4Y
11
3B
10
3A
9
3Y
8
DC
2
OUTPUT PIN TO V
RIPPLE
SHORT PROTECTOR
FILTER
PREDRIVER POWER
+
LOAD SHORT
IN
-
PROTECTOR
PREDRIVER
POWER
OUTPUT PIN TO GND
OVER VOLTAGE/
BIAS SHORT PROTECTOR
CIRCUIT
SURGE
V
CC
THERMAL
STANDBY
OUTPUT PIN TO GND
SW SHUT DOWN
SHORT PROTECTOR
PREDRIVER POWER
+
LOAD SHORT
IN
-
PROTECTOR
PREDRIVER POWER
OUTPUT PIN TO V
SHORT PROTECTOR
5 7
POP
IN 4
OUT
5
4
IN
EN 1
THERMAL
SHUTDOWN
1A 1 14 VDD
1Y 6A
2 13
2A 6Y
3 12
2Y 4 11 5A
3A 5Y
5 10
3Y 4A
6 9
GND 7 8 4Y
V
CC
14
CC
-OUT1
13
POWER
PWR-GND1
12
GND1
11 +OUT1
-OUT2
9
POWER
PWR-GND2
10
GND2
8 +OUT2
CC
GATE CURRENT
CONTROL LIMIT
FLAG
DELAY
UVLO
2
GND
NJM4580E(TE2) (X2331A0R)
Dual Operational Amplifier
DM: IC16
Output A 1
Inverting
2
Input A
- +
Non-Inverting
3
+
Input A
-DC Voltage Supply 4 -V
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
5 OUT
3 FLG
+DC Voltage
8
+V
Supply
7 Output B
Inverting
6
- Input B
Non-Inverting
5
Input B
Switch
1
Collector
Q2
Q1
Switch
2
Emitter
Timing
3
Capacitor
4
Gnd