-69-
IC Block Diagrams
●
MR4010 <Power OSC, IC631>
R
Q
S
GND
Emitter / OCL
VIN
VCC
Collector
Start-up circuit UVLO
comparator
Start-up circuit
Soft drive circuit
OCP threshold comparator
Burst mode OCP threshold comparator
Restart timer
Latch circuit reset
comparator
UVLO comparator
V
UL
V
CC(start)
/V
CC(stot)
V
CC(startup off)
/V
CC(startup on)
V
TH(OCL)
V
TH(burst limit)
Q1
V
OVP
V
ref
I
F/B
OVP comparator
Thermal Shutdown circuit
Zero current detection
circuit
Turn-on dead timer
Standby circuit
ON width timer
S
Q
R
+
-
+
-
-
+
-
+
-
+
-
+
1
2
3
4
-
+
7
9
5
Z / C
F / B
●
NJW1156<Audio Selector,IC5001>
