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A
B
C
BD-940
POWER
1
2
3
AC IN
4
5
6
7
8
9
10
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★ Components having special characteristics are marked ⚠ and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.
48
D
E
F
(111.6)
(0)
(319.5)
(111.4)
(0.2)
(0.3)
(5.0)
(0)
(1.1)
(0.2)
(0)
(14.9)
(1.1)
(0.3)
(2.4)
(0)
(0.4)
(1.2)
(319.5)
IC1: L6566BTR
Multi mode controller for SMPS
VREF
SS
AOMP
VFF
10
14
9
15
15 uA
6.4V
TIME
-
OVPL
OVP
SOFT-START
OUT
OFF2
LOW CLAMP
1 mA
HV
1
and
and DISABLE
+
FAULT MNGT
7.7V
LINE VOLTAGE
Q
FEEDFORWARD
Reference
VOLTAGE
voltages
REGULATOR
7
CS
Vcc
5
Internal supply
LEB
and
ADAPTIVE UVLO
UVLO
1.5 V
-
+
-
+
+
-
VIn
PWM
OCP
Vcc
Vcc
UVLO_SHF
400 uA
+
6
FMOD
-
-
Hiccup-mode
14V
OCP logic
5.7V
BURST-MODE
+
OCP2
4
GD
OSC
13
OSCILATOR
R
Q
DRIVER
MODE SELECTION
S
MODE/SC
12
and
TURN-ON LOGIC
IC4: NJM431U
TIME
50 mV
ZERO CURRENT
OUT OVPL
Adjustable precision shunt regulator
-
DETECTOR
100 mV
4.5V
ZCD
11
+
OFF2
-
OVERVOLTAGE
OVP
LATCH
PROTECTION
+
8
GIS
IC_LATCH
16
-
AC_OK
AC_FAIL
DISABLE
1
15 uA
0.450V
3 V
+
0.485V
UVLO
REFERENCE
3
GND
G
H
I
(319.5)
(448.2)
(448.2)
(319.2)
(319.2)
(1.1)
(1.1)
(1.1)
(0)
(0)
(14.9)
(14.9)
(9.3)
(4.0)
(0)
Primary side ground
(14.9)
2
3
ANODE
CATHODE
J
K
L
0
36.2
AC
14.8
12.2
0
0
AC
7.6
AC
4.4
POWER
TRANSFORMER
0
-12.2
IC2
8.4
(3.3)
(0)
7.4
7.4
2.4
0
-12.5
12.2
IC3
14.3
(0.9)
14.3
14.3
0
0
M
N
CB3
36.2
12.2
0
12.2
12.2
Page 45
A3
0
to MAIN (1)_CB203
0
-12.5
0
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