NCP1030_06 Datasheet, PDF (3/18 Pages) ON Semiconductor – Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems

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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