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NCP1237 Datasheet(PDF) 13 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) 13 Page - ON Semiconductor

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NCP1237
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13
When VHV crosses the VHV(start) threshold, the controller
can start immediately. When it crosses VHV(stop), it triggers
a timer of duration tHV: this ensures that the controller
doesn’t stop in case of line cycle drop−out.
Figure 7. AC Input Brown−out Timing Diagram
time
VHV
time
DRV
VHV(start)
Starts at next
VCC(ON)
VHV(stop)
Brown-out
HV
t
The same scheme is used for the Line OVP, except that this
time the controller must not stop instantaneously when the
input voltage goes above VHV(OV1). In order to be
insensitive to spikes and voltage surges a blanking circuit is
inserted after the output of the comparator, with a duration
of tOV(blank).



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