NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
+
AC Line
Input
Snubber
+
+
Converter
DC Output
−
Power Switch Circuit Output
V
CC
Startup
Circuit
Startup/V Reg
+
CC
10 V
+
−
Fault
Detector
Internal
Bias
+
V
Bypass/
7.5/8.5 V
CC
Fault Timing/
Sweep
Control
Fault
Latch
S
V
CO
Power
Switch
Circuit
Thermal
Shutdown
Undervoltage
Lockout
Q
−
+
R
Driver
+
4.5 V
V
CC
Oscillator
I
H
= 10 m A
Turn On
Latch
48 m A
Turn Off
Latch
R
Q
Ck
+
2.6 V
S
Q
Control
Input
R
10 V
Leading Edge
Blanking
+
−
+
3.3 V
+
Current Limit
Comparator
R
SENSE
I
H
= 10 m A
48 m A
Ground
Figure 2. Representative Block Diagram
http://onsemi.com
3