Mitsubishi Electric XD8100U Service Manual page 116

IC550 NC7WZ125K8X
OE1 1 8 VCC
A1 2 7 OE2
Y2 3 6 Y1
GND 4 5 A2
Function Table
Inputs Output
An Yn
OE
L L L
L H H
H L Z
H H Z
H : HIGH Logic Level
L : LOW Logic Level
Z : 3-STATE
IC630 MP2367DNE-LF-Z
+
1.0V –
+
FB 5
110KHz/340KHz
0.3V –
–
+
SS 8
ERROR
0.795V
+
AMPLIFIER
6
COMP
–
EN 7
EN OK
LOCKOUT
2.5V +
COMPARATOR
+
1.3V – SHUTDOWN
COMPARATOR
IC6J0 R1170H181B-T1-F
4
V
DD
-
+
Vref
Current Limit
Thermal Shutdown
1
CE
IC610 AD8183ARUZ
IN0 A
IN0 B
IN1 A
IN1 B
IN2 A
IN2 B
SEL A/B
OE
OVP
RAMP
∑
OSCILLATOR
CLK
–
CURRENT
+
COMPARATOR
6A
1.2V
IC6K0, IC6S1 SI-3033KM-TL
5
VIN 2
V
OUT
VC 1
2
GND
1
20
G = +1 or +2
12
3
18
G = +1 or +2
10
5
16
G = +1 or +2
6
22
23
Output Enable
6,13,14,17,21,24 7,15,19 2,4,9,11
VCC VEE
GND
TRUTH TABLE
SEL A/B OE Output
0 0 IN A
1 0 IN B
0 1 Hight Z
1 1 Hight Z
CURRENT
2
SENSE
AMPLIFIER
+
5V
–
1
M1
0.13Ω
S Q
3
R Q
M2
1.2Ω
4
OVP
IN < 4.05V
IN
INTERNAL
REGULATORS
TSD
–
+
REF
- B2 -
OUT 0
OUT 1
OUT 2
IN
BS
SW
GND
4 VOUT
5 Sense
3
GND