Sony MV-101 Service Manual page 18

MV-101
• IC Block Diagrams
– POWER board –
IC2 NJM2360AD
CS 1 Q2 Q S
Q1
R
ES 2
Ipk
CT 3
CT OSC
+
VREF
GND 4
1.25V –
COMP
IC3 LM2588T-12
SHUTDOWN
FREQUENCY
ADJUSTMENT OSCILLATOR
DUTY CYCLE
COMPARATOR
CYCLE-SKIPPING
COMPARATOR
1
8 CD
7 SI
6 V+
5 INVIN
CURRENT LIMIT, THERMAL LIMIT,
UNDERVOLTAGE SHUTDOWN
CONTROL DRIVER
LOGIC STAGE
CURRECTIV CURRENT
RAMP SENSE
100kHz
+
AMP
+
+
–
–
ERROR
+0.3V
AMP
SOFT– START
2
+1.23V
INTERNAL
SUPPLY
VOLTAGE
+2.9V
REGULATOR
3 4 5 6 7
18