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NCP4353_12 Datasheet, PDF (1/17 Pages) ON Semiconductor – Secondary Side SMPS OFF Mode Controller for Low Standby Power | |||
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NCP4353, NCP4354
Secondary Side SMPS OFF
Mode Controller for Low
Standby Power
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 âno loadâ 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 âActive OFFâ signal, meaning that it
drives optocoupler current during OFF mode to pullâdown 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.
The NCP4353 is available in TSOPâ6 package while the NCP4354
is available in SOICâ8 package.
Features
⢠Operating Input Voltage Range: 2.5 V to 36.0 V
⢠Supply Current < 100 mA
⢠±0.5% Reference Voltage Accuracy (TJ = 25°C)
⢠Constant Voltage and Constant Current (A versions) Control Loop
⢠Indication LED PWM Modulated Driver (NCP4354x)
⢠Designed for use with NCP1246 Fixed Frequency PWM Controller
⢠This is a PbâFree and HalideâFree Device
Typical Applications
⢠Offline Adapters for Notebooks, Game Stations and Printers
⢠High Power ACâDC Converters for TVs, SetâTop Boxes, Monitors, etc.
http://onsemi.com
MARKING
DIAGRAMS
TSSOPâ6
CASE 318G
XXXAYWG
G
1
1
8
1
SOICâ8
CASE 751
8
XXXXX
ALYWX
G
1
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= PbâFree Package
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
DEVICE OPTIONS
NCP4353A
Adjustable
No
Vmin
Current
Yes
Regulation
LED Driver
No
Package
TSOPâ6
NCP4353B
Yes
No
No
TSOPâ6
NCP4354A
Yes
Yes
Yes
SOICâ8
NCP4354B
Yes
No
Yes
SOICâ8
© Semiconductor Components Industries, LLC, 2012
1
October, 2012 â Rev. 2
Publication Order Number:
NCP4353/D
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