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/Title (EVBUM2341DB - Implementing High Power Notebook Adapter Evaluation Board User's Manual)
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BroadVision, Inc.
2019-10-23T10:29:37+08:00
2019-10-23T10:28:47+08:00
2019-10-23T10:29:37+08:00
application/pdf
EVBUM2341DB - Implementing High Power Notebook Adapter Evaluation Board User's Manual
ON Semiconductor
This evaluation board user’s manual provides elementary
information about a high efficiency, low no-load power consumption
reference design that is targeting power laptop adapter or similar type
of equipment that accepts 19.5 VDC on the input.
The power supply implements PFC front stage to assure unity power
factor and low THD, current mode LLC power stage to enhance
transient response and secondary side synchronous rectification to
maximize efficiency. This design focuses mainly on the NCP1399
current mode LLC controller description – please refer to NCP1602
and NCP4305 material to gain more information about these devices.
The NCP1399 is a current mode LLC controller which means that
the operating frequency of an LLC converter is not controlled via
voltage (or current) controlled oscillator but is directly derived from
the resonant capacitor voltage signal and actual feedback level. This
control technique brings several benefits compare to traditional
voltage mode controllers like improved line and load transient
response and inherent out of zero voltage switching protection. The
LLC controller also features built-in high voltage startup and PFC
operation control pins that ease implementation of a power supply
with PFC front stage and no standby power supply on board.
The enhanced light lad operation of the LLC controller allows
SMPS design to pass the latest no-load and light load consumption
limits and still keeping output regulated with excellent transient
response from no-load to full-load steps.
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