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/Title (EVBUM2138DB - 65 W Off-Line Adapter Featuring Very Low No-Load Power Consumption Evaluation Board User's Manual)
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EVBUM2138DB - 65 W Off-Line Adapter Featuring Very Low No-Load Power Consumption Evaluation Board User's Manual
ON Semiconductor
When designing an offline Ac-Dc power adapter, one key
consideration is the power consumption in standby mode.
Standby power consumption, also sometimes referred to as
vampire power or phantom load, is the power consumed by
electronic devices when they are switched off, but still
plugged into the wall. It is estimated that standby power
accounts for nearly 10% of the energy usage in the average
American home. One common contributor to vampire
power in the home is notebook adapters. These adapters
spend a lot of time left underneath desks with the notebook
computer disconnected or powered off. The following
design note features the latest techniques for minimizing the
standby power consumption of a 65 W notebook adapter.
When focusing on the no load power consumption of an
adapter design, the key losses need to be identified.
Switching losses and circuit biasing must be minimized or
eliminated completely. The latest technique for minimizing
losses during no load is to turn off the Ac-Dc controller and
allow the output voltage to drop. Because the adapter is not
supplying power, a drop in output voltage is viewed as
acceptable. The following design utilizes the NCP1246
flyback controller and the NCP4354A secondary side
controller to realize this technique. Both controllers have
built-in features focused on minimizing no load input power
consumption. Primary side flyback controller NCP1246 is
a fixed frequency current mode controller featuring
dynamic self supply. It also supports OFF mode and
integrated active X2 capacitor discharge feature, which
significantly reduces input power at very light load and no
load conditions. NCP1246 includes frequency fold-back
and skip mode to provide high efficiency in light load.
Secondary side controller NCP4354A provides output
voltage and current regulation (CCCV operation of whole
SMPS), very light load condition detection, OFF mode
control and indication LED driver. The NCP4354A is
specially design for use in tandem with the NC
2019-10-25T14:28:41+08:00
BroadVision, Inc.
2019-10-25T14:29:45+08:00
2019-10-25T14:29:45+08:00
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