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400DAFBA2 датащи(PDF) 29 Page - ON Semiconductor

номер детали 400DAFBA2
подробное описание детали  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  47 Pages
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

400DAFBA2 датащи(HTML) 29 Page - ON Semiconductor

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NCP12400
www.onsemi.com
29
Figure 56. Start−up, Shut−down and AC Line Unplug Time Diagram
time
VHV
time
One Shot
time
DRV
VHV(start)
tDET
time
VCC
VCC(on)
VCC(off)
VCC(inhibit)
VFB
VOFF
VON
Low consumption mode
Ready to RUN
DRV start
condition
DSS start to
charge the Vcc
cap
HV
timer
starts
HV
timer
restarts
AC line Unplug
detector starts
RUN
AC line unplug
X2 capacitor
discharge
Starts
only at
VCC(on)
VCC(dis)
tDIS
X2 cyclic discharge
process starts
tDET
No AC detection
X2 capacitor
discharge
tDIS
No AC detection
Low consumption off mode
Skip mode
tGTSG
Dynamic
Self−Supply
in off mode
time
Oscillator with Frequency Jittering
The NCP12400 includes an oscillator that sets the
switching frequency 65 kHz or 100 kHz depending on the
version. The maximum duty−ratio of the DRV pin is 80%.
In order to improve the EMI signature, the switching
frequency jitters
±4 kHz around its nominal value, with a
triangle−wave shape and at a frequency of 125 Hz. This
frequency jittering is active even when the frequency is
decreased to improve the efficiency in light load condition.
Figure 57. Frequency Modulation of the Maximum
Switching Frequency
Time
fOSC
fOSC
8 ms
(125 Hz)
Nominal fOSC
fOSC
+ 4 kHz
− 4 kHz



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