NCP1031 データシートの表示（PDF） - ON Semiconductor

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NCP1031

Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems

ON Semiconductor 

CT Ramp

CT Charge

Signal

PWM

Comparator

Output

PWM Latch

Output

Power Switch

Circuit Gate Drive

Leading Edge

Blanking Output

VCC(on)

VCC(off)

VCC(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

ISTART

0 mA

3.0 V

VUV

0V

2.5 V

VFB

0V

VDRAIN

0V

Power−up &

standby Operation

Normal Operation

Output Overload

Figure 3. Auxiliary Winding Operation with Output Overload Timing Diagram

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