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NCP12401EBAAA1 Datasheet(PDF) 28 Page - ON Semiconductor |
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NCP12401EBAAA1 Datasheet(HTML) 28 Page - ON Semiconductor |
28 / 44 page NCP12401 www.onsemi.com 28 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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