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NCP1237 Datasheet(PDF) 27 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) 27 Page - ON Semiconductor

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NCP1237
http://onsemi.com
27
Figure 25. Skip Cycle with Soft−Skip Timing Diagram
Time
VFB
Vskip(out)
Time
DRV
Time
CS setpoint
Soft-skip
Enters
skip
Exits
skip
Enters
skip
Exits
skip
Soft-
skip
Exits
soft-skip
Vskip(in)
VFB(fold)
If during the Soft−Skip duration the FB voltage goes
above VFB(fold), the Soft−Skip ends instantaneously, and the
peak current follows the setpoint imposed by the
current−mode control. This transient load detection feature
avoids large output voltage drops if a load transient occurs
while the controller is in soft−skip mode.



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