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/Title (NCP4353 - Secondary Side SMPS OFF Mode Controller for Low Standby Power)
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BroadVision, Inc.
2020-09-23T12:57:07+02:00
2015-04-01T09:51:37-07:00
2020-09-23T12:57:07+02:00
application/pdf
NCP4353 - Secondary Side SMPS OFF Mode Controller for Low Standby Power
ON Semiconductor
The NCP4353/4 is a secondary side SMPS controller designed for
use in applications which require extremely low no load power
consumption. The device is capable of detecting “no load” conditions
and entering the power supply into a low consumption OFF mode.
During OFF mode, the primary side controller is turned off and energy
is provided by the output capacitors thus eliminating the power
consumption required to maintain regulation. During OFF mode, the
output voltage relaxes and is allowed to decrease to an adjustable
level. Once more energy is required, the NCP4353/4 automatically
restarts the primary side controller. The NCP4353/4 controls the
primary side controller with an “Active OFF” signal, meaning that it
drives optocoupler current during OFF mode to pull−down the FB pin
of the primary controller.
During normal power supply operation, the NCP4353/4 provides
integrated voltage feedback regulation, replacing the need for a shunt
regulator. The A versions include a current regulation loop in addition
to voltage regulation. Feedback control as well as ON/OFF signal can
be provided with only one optocoupler.
The NCP4354 includes a LED driver pin implemented with an open
drain MOSFET driven by a 1 kHz square wave with a 12.5% duty
cycle when primary side is in regulation for indication purpose.
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