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NCP1237 Datasheet(PDF) 22 Page - ON Semiconductor

Part # NCP1237
Description  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1237 Datasheet(HTML) 22 Page - ON Semiconductor

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NCP1237
http://onsemi.com
22
In the latched version (Figure 19), the controller can
restart only if a brown−out or a VCC reset occurs. In a real
application this can only happen if the power supply is
unplugged from the mains line.
Figure 19. Latched Timer−Based Overcurrent Protection
time
Fault Flag
time
VCC
time
DRV
VCC(on)
VCC(min)
Overcurrent
applied
time
Output Load
Max Load
time
Fault timer
tfault
Fault
timer
starts
Controller
latches off
No restart
when fault
disappears
tfault



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