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NCP12401EBAAA1 Datasheet(PDF) 19 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) 19 Page - ON Semiconductor

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NCP12401
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VCC(min), until the input voltage is high enough to ensure a
proper start−up, i.e. when VHV reaches VHV(start). The
controller actually starts the next time VCC reaches VCC(on).
The controller then delivers pulses, starting with a soft−start
period tSSTART during which the peak current linearly
increases before the current−mode control takes over.
Even though the Dynamic Self−Supply is able to maintain
the VCC voltage between VCC(on) and VCC(min) by turning
the HV start−up current source on and off, it can only be used
in light load condition, otherwise the power dissipation on
the die would be too much. As a result, an auxiliary voltage
source is needed to supply VCC during normal operation.
The Dynamic Self−Supply is useful to keep the controller
alive when no switching pulses are delivered, e.g. in
brown−out condition, or to prevent the controller from
stopping during load transients when the VCC might drop.
The NCP12401 accepts a supply voltage as high as 28 V,
with an overvoltage threshold VCC(ovp) that latches the
controller off.
Figure 46. VCC Start−up Timing Diagram
time
VHV
time
VCC
time
DRV
VHV(start)
V HV(min)
VCC(on)
V CC(min)
HV current
source = Istart1
HV current
source = Istart2
Waits next
VCC(on)
before starting
VCC(inhibit)
For safety reasons, the start−up current is lowered when
VCC is below VCC(inhibit), to reduce the power dissipation in
case the VCC pin is shorted to GND (in case of VCC capacitor
failure, or external pull−down on VCC to disable the
controller). There is only one condition for which the current
source doesn’t turn on when VCC reaches VCC(inhibit): the
voltage on HV pin is too low (below VHV(min)).


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