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/Title (EVBUM2340DB - NCP4305FBDAP Evaluation Board User's Manual)
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2019-10-31T13:23:17+08:00
BroadVision, Inc.
2019-10-31T13:24:26+08:00
2019-10-31T13:24:26+08:00
Acrobat Distiller 19.0 (Windows)
application/pdf
EVBUM2340DB - NCP4305FBDAP Evaluation Board User's Manual
ON Semiconductor
The presented design demonstrates a switching mode AC/DC
adapter with high efficiency through whole load range including no
load consumption. The design utilizes a primary controller
NCP1249C/D, secondary side CVCC and off-mode controller
NCP4354A and last but not least synchronous rectification controller
NCP4305.
The NCP1249 is fixed frequency current mode flyback controller
featuring a peak power excursion, high-voltage start-up, off-mode and
X2 capacitor discharging feature. Secondary side controller
NCP4354A features two OTAs that are used to provide constant
voltage and constant current regulator, very light load condition
detection, off-mode control and indication LED driver. NCP4354A
communicates with primary controller featuring off-mode through
regulation optocoupler. Secondary side synchronous controller
NCP4305 is used to control a MOSFET transistor that is used in place
of a rectification diode on the secondary side.
The NCP4035 controller turns the synchronous rectifier transistor
on in time for current to flow from the transformer to adapter output.
Since the voltage drop on the transistor is lower than the voltage drop
over a diode this leads to a higher overall efficiency adapter. The
NCP4305 monitors the voltage across the synchronous rectification
transistor and according to its magnitude and value; it turns the
transistor on and off. This controller also includes feature light load
detection that is used to modulate the driver output for smooth
transitions between medium and light loads. In very light loads the
light load detection feature will disable the controller to eliminate
switching losses. ON Semiconductor’s newest synchronous rectifier
has a 4 A drive and an 8 A sink driver. The strong and robust driver of
the NCP4305 allows for a very fast, controlled and accurate turn on
and turn off to maximize conduction period. The strong sink on the
NCP4305 allows this controller to operate in CCM. To further
improve efficiency the NCP4305 has inc
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