ncp1001 ON Semiconductor, ncp1001 Datasheet - Page 12

• Manufacturer Part Number: ncp1001
• Description: Integrated Off-line Switching Regulator
• Manufacturer: ON Semiconductor

Oscillator Ramp
Feedback Input
(R
Oscillator
Duty Cycle
Oscillator Clock
PWM
Comparator
Output
PWM Latch
Q Output
Leading Edge
Blanking Input
(Power Switch
Circuit Current)
Power Switch
Circuit Gate Drive
Zero Duty Cycle
Power Switch
Circuit Voltage
(Pin 5)
fb
V
Voltage)
CC
(Pin 1)
Limiter
Switching Disabled
Start−up
Figure 19. Start−up and Normal Operation Timing Diagram
Figure 18. Pulse Width Modulation Timing Diagram
Regulation Threshold
NCP1000, NCP1001, NCP1002
Normal PWM Operating Range
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12
Normal Operation
Switching
Output Overload
8.6 V
7.5 V
0 V
Flyback Voltage
Rectified Line Voltage
0 V
Current Limit
Propagation
Delay
Current
Limit
Threshold