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NCP12401EBAAA1 Datasheet(PDF) 32 Page - ON Semiconductor

Part # NCP12401EBAAA1
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

NCP12401EBAAA1 Datasheet(HTML) 32 Page - ON Semiconductor

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NCP12401
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32
Quiet−Skip
To further avoid acoustic noise, the circuit prevents the
burst frequency during skip mode from entering the audible
range by limiting it to a maximum of 800 Hz. This is
achieved via a timer tquiet that is activated during
Quiet−Skip. The start of the next burst cycle is prevented
until this timer has expired. As the output power decreases,
the switching frequency decreases. Once it hits minimum
switching frequency fOSC(min), the skip−in threshold is
reached and burst mode is entered − switching stops as soon
as the current drive pulses ends – it does not stop
immediately.
Once switching stops, FB will rise. As soon as FB crosses
the skip−exit threshold, drive pulses will resume, but the
controller remains in burst mode. At this point, a 1250
ms
(typ) timer tquiet is started together with a count to nP,skip
pulses counter. This nP,skip pulses counter ensures the
minimum number of DRV signal pulses in burst. The next
time the FB voltage drops below the skip−in threshold, DRV
pulses stop at the end of the current pulse as long as nP,skip
drive pulses have been counted (if not, they do not stop until
the end of the nP,skip −th pulse). They are not allowed to start
again until the timer expires, even if the skip−exit threshold
is reached first. It is important to note that the timer will not
force the next cycle to begin – i.e. if the natural skip
frequency is such that skip−exit is reached after the timer
expires, the drive pulses will wait for the skip−exit
threshold.
This means that during no−load, there will be a minimum
of nP,skip drive pulses, and the burst−cycle period will likely
be much longer than 1250
ms. This operation helps to
improve efficiency at no−load conditions.
In order to exit burst mode, the FB voltage must rise higher
than Vskip(tran) level. If this occurs before tquiet expires, the
drive pulses will resume immediately – i.e. the controller
won’t wait for the timer to expire. Figure 63 provides an
example of how Quiet−Skip works, while Figure 62 shows
the immediate leaving the quiet skip mode by crossing the
transient enhancement level Vskip(tran).


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