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NCP12401EBAAA1 Datasheet(PDF) 28 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) 28 Page - ON Semiconductor

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Figure 55. HV Pin ac Input Timing Diagram with X2 Capacitor Discharge Sequence When the Application is
Unplugged Under High Line Condition
time
VHV
One Shot
time
DRV
VHV(start)
VHV(stop)
tDET
time
X2 discharge
current
t DIS
X2 discharge
AC line unplug
X2 capacitor
discharge
AC line Unplug
detector starts
tDET
tDIS
X2 capacitor
discharge
Device is stopped
No AC detection
HV
timer
restarts
HV
timer
starts
X2 discharge
Starts
only at
VCC(on)
VCC
VCC(dis)
tHV
Device shunts the
X2 discharge
current internally
time
time
The Low Consumption Off Mode
There was implemented the low consumption off mode
allowing to reach extremely low no load input power as
described in previous chapters. If the voltage at feedback pin
decreases below the 0.6 V the controller enters the off mode.
The internal VCC is turned−off, the IC consumes extremely
low VCC current and only the voltage at external VCC
capacitor is maintained by the Dynamic Self−Supply circuit.
The Dynamic Self−Supply circuit keeps the VCC voltage
between the VCC(on) and VCC(off) levels. The supply for the
FB pin watch dog circuitry and FB pin bias is provided via
the low consumption current sources from the external VCC
capacitor. The controller can only start, if the FB pin voltage
increases above the 2.2 V level. See Figure 56 for timing
diagrams.
Only the X2 cap discharge and Self−Supply features is
enabled in the low consumption off mode. The X2 cap
discharging feature is enable due the safety reasons and the
Self−Supply is enabled to keep the VCC supply, but only
very low VCC consumption appears in this mode. Any other
features are disabled in this mode.
The information about the latch status of the device is kept
in the low consumption off mode and this mode is used for
the TSD protection as well. The protection timer
GoToOffMode tGTOM is used to protect the application
against the false activation of the low consumption off mode
by the fast drop outs of the FB pin voltage below the 0.4 V
level. E.g. in case when is present high FB pin voltage ripple
during the skip mode.


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