NCP1000P Ver la hoja de datos (PDF) - ON Semiconductor

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NCP1000P

Integrated Off−Line Switching Regulator

ON Semiconductor 

Feedback Input

(Rfb Voltage)

Oscillator Ramp

Oscillator

Duty Cycle

Oscillator Clock

PWM

Comparator

Output

PWM Latch

Q Output

Power Switch

Circuit Gate Drive

Leading Edge

Blanking Input

(Power Switch

Circuit Current)

Zero Duty Cycle

NCP1000, NCP1001, NCP1002

Current Limit

Propagation

Delay

Current

Limit

Threshold

Normal PWM Operating Range

Output Overload

Figure 18. Pulse Width Modulation Timing Diagram

VCC Limiter

(Pin 1)

Regulation Threshold

Power Switch

Circuit Voltage

(Pin 5)

Switching Disabled

Startup

Switching

Normal Operation

Figure 19. Startup and Normal Operation Timing Diagram

8.6 V

7.5 V

0V

Flyback Voltage

Rectified Line Voltage

0V

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