Pioneer CD-UB100, Service Manual

Page: 34 / 37

CD-UB100/XN/UC
34
1 2 3 4
1 2 3 4
C
D
F
A
B
E
-
Pin Layout
-
Block Diagram
– +
–
+
–
+
–
+
Σ
V
IN
2.9 V BIAS
REGULATOR
200 kHz
OSCILLATOR
FREQUENCY
FOLDBACK
SW FB 1, 8, 9, 16, 17 GND
SLOPE COMP
ANTISLOPE COMP
BIAS
INTERNAL V
CC
SYNC
0.4 V
5.5
μ
A
CURRENT COMPARATOR
R
LIMIT
R
SENSE
ERROR
AMPLIFIER
g
m
= 2000
μ
Mho
Q2
FOLDBACK
CURRENT
LIMIT
CLAMP
BOOST
R
S
FLIP-FLOP
DRIVER
CIRCUITRY
S R
Q1 POWER SWITCH
1.22 V
4
10 14
shdn
15
6
2
12
11 V
C
LOCKOUT
COMPARATOR
SHUTDOWN
COMPARATOR
2.38 V
×
1
Q3
V
C(MAX)
CLAMP
LT1766EFE-5
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
SW
NC
VIN
NC
BOOST
NC
GND
GND
shdn
SYNC
NC
FB/SENSE
VC
BIAS
GND
GND
17