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NCP1031DR2G
Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems
ON Semiconductor
NCP1031DR2G Datasheet PDF : 18 Pages
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C
T
Ramp
C
T
Charge
Signal
PWM
Comparator
Output
PWM Latch
Output
Power Switch
Circuit Gate Drive
Leading Edge
Blanking Output
V
CC(on)
V
CC(off)
V
CC(reset)
NCP1030, NCP1031
COMP Voltage
Current Limit
Propagation Delay
Normal PWM Operating Range
Output Overload
Figure 2. Pulse Width Modulation Timing Diagram
Current Limit
Threshold
0V
I
START
0 mA
3.0 V
V
UV
0V
2.5 V
V
FB
0V
V
DRAIN
0V
Power−up &
standby Operation
Normal Operation
Output Overload
Figure 3. Auxiliary Winding Operation with Output Overload Timing Diagram
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