NCP1396B ON Semiconductor, NCP1396B Datasheet - Page 24

• Manufacturer Part Number: NCP1396B
• Description: High Performance Resonant Mode Controller featuring High-voltage Drivers
• Manufacturer: ON Semiconductor

As described in the data-sheet, two startup levels VCC
are available, via two circuit versions. The NCP1396
features sufficient hysteresis (3V typically) to allow a
classical startup method with a resistor connected to the
bulk capacitor. Then, at the end of the startup sequence,
an auxiliary winding is supposed to take over the
controller
applications where the resonant controller is powered
from a standby power supply, the startup level is 10V
typically and allows for the direct a connection from a
supply
Figure 50. When the Vcc is too low, all pulses are stopped until Vcc goes back to the startup voltage
voltage.
To
the
opposite,
NCP1396A, NCP1396B
http://onsemi.com
for
ON
24
12V source. Thanks to this NCP1396B, simple ON/OFF
operation is therefore feasible.
The high-voltage driver
circuitry, requiring an external high-voltage diode for the
capacitor refueling path. Figure 51 shows the internal
architecture of the high-voltage section.
The driver features a traditional bootstrap