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NCP12401BBAAA1 Datasheet(PDF) 33 Page - ON Semiconductor

Part # NCP12401BBAAA1
Description  Fixed Frequency Current Mode Controller for Flyback Converters
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP12401BBAAA1 Datasheet(HTML) 33 Page - ON Semiconductor

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NCP12401
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33
Figure 62. Leaving the Quiet−Skip Mode during Load Transient
Figure 63. Quiet−Skip Timing Diagram − option
VFB
Time
DRV
Enters
skip
Enters
skip
Exits skip
after quiet
timer
expires
Crossing the transient
enhancement level
stops the quiet skip
immediately
Vskip(in)
Vskip(out)
Vskip(tran)
tquiet
tquiet
Time
DRV
DRV pulses does
not start because
V FB<Vskip(in)
VFB
time
Vskip(out)
Vskip(in)
DRV
VFB
time
Vskip(out)
Vskip(in)
tquiet
tquiet
DRV
time
Vskip(out)
Vskip(in)
tquiet
tquiet
1
2
3
Sequence of events
1 ; 2 ; 3 starts the quiet
skip mode
The DRV pulses does not
start even when VFB >Vskip(out)
in the quiet skip mode
VFB
Vskip(tran)
nP,skip
nP,skip
nP,skip
When V FB >Vskip (tran) the quiet skip
mode immediately finishes
Quiet skip mode
forces at least n p,skip
pulses in skip mode
burst
nP,skip
nP,skip
Running just above skip
mode with fsw =fosc(min)
time
time
time


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