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NCP4355C Datasheet

Secondary Side SMPS OFF Mode Controller

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NCP4355
Secondary Side SMPS OFF
Mode Controller for Low
Standby Power
Description
The NCP4355 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 NCP4355 automatically
restarts the primary side controller by ONOFF current that flows
through ONOFF optocoupler. The NCP4355 controls the primary
controller with an “Active ON” signal, meaning that it only drives
optocoupler current during ON mode to minimize consumption during
OFF mode.
During normal power supply operation, the NCP4355 provides
integrated voltage feedback regulation, replacing the need for a shunt
regulator. The A and C versions include a current regulation loop in
addition to voltage regulation.
The NCP4355 includes a LED driver pin (except C version)
implemented with an open drain MOSFET driven by a 1 kHz square
wave with a 12.5% duty cycle for indication purpose.
The NCP4355 is available in SOIC8 package.
DEVICE OPTIONS
Adjustable Vmin
Current Regulation
LED driver
NCP4355A
No
Yes
Yes
NCP4355B
Yes
No
Yes
NCP4355C
Yes
Yes
No
Features
Operating Input Voltage Range: 3.5 V to 36.0 V
Supply Current < 100 mA
±0.5% Reference Voltage Accuracy (TJ = 25°C)
Constant Voltage and Constant Current (A and C versions) Control
Loop
Indication LED PWM Modulated Driver (except NCP4355C)
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
Offline Adapters for Notebooks, Game Stations and Printers
High Power ACDC Converters for TVs, SetTop Boxes, Monitors etc.
http://onsemi.com
8
1
SOIC8
D SUFFIX
CASE 751
8
XXXXX
ALYWG
G
1
XXXXX = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 16 of this data sheet.
© Semiconductor Components Industries, LLC, 2013
August, 2013 Rev. 1
1
Publication Order Number:
NCP4355/D


  ON Semiconductor Electronic Components Datasheet  

NCP4355C Datasheet

Secondary Side SMPS OFF Mode Controller

No Preview Available !

NCP4355
VCC
FBC
ON/OFF
VCC
management
VDD
VREF
IDRIVEON
Power
RESET
SW1
LED
Power
RESET
Current
Regulation
Sink only
OTA
VDD
IBIASV
VREFC
SW3
ISNS
QS
QR
Sink only OTA
Voltage
Regulation
VREF
0.9 x VREF
VSNS
IBIASV
Enabling
Off Mode
Detection
VCC
10%VCC
OFFDET
GND
SW2
1 kHz, 12% D.C.
Oscillator
PowerRESET
Figure 1. Simplified Block Diagram NCP4355A
VCC
FBC
ON/OFF
manaVgCeCment
VDD
VREF
IDRIVEON
Power
RESET
SW1
LED
Power
RESET
VDD
IBIASV
SW3
QS
QR
Sink only OTA
Voltage
Regulation
VREF
0.9 x VREF
VSNS
IBIASV
Enabling
Off Mode
Detection
VCC
10%VCC
OFFDET
GND
SW2
1 kHz, 12% D.C.
Oscillator
PowerRESET Min Output
Voltage
Figure 2. Simplified Block Diagram NCP4355B
VREFM
VMIN
http://onsemi.com
2


Part Number NCP4355C
Description Secondary Side SMPS OFF Mode Controller
Maker ON Semiconductor
Total Page 17 Pages
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