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 “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.
The NCP4353 is available in TSOP−6 package while the NCP4354
is available in SOIC−8 package.
Features
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MARKING
DIAGRAMS
TSSOP−6
CASE 318G
1
1
8
8
1
A
L
Y
W
G
SOIC−8
CASE 751
1
XXXXX
ALYWX
G
XXXAYWG
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free 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.
•
•
•
•
•
•
•
Operating Input Voltage Range: 2.5 V to 36.0 V
Supply Current < 100
mA
±0.5%
Reference Voltage Accuracy (T
J
= 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 Pb−Free and Halide−Free Device
Typical Applications
•
Offline Adapters for Notebooks, Game Stations and Printers
•
High Power AC−DC Converters for TVs, Set−Top Boxes, Monitors, etc.
DEVICE OPTIONS
NCP4353A
Adjustable
V
min
Current
Regulation
LED Driver
Package
No
Yes
No
TSOP−6
NCP4353B
Yes
No
No
TSOP−6
NCP4354A
Yes
Yes
Yes
SOIC−8
NCP4354B
Yes
No
Yes
SOIC−8
©
Semiconductor Components Industries, LLC, 2012
October, 2012
−
Rev. 2
1
Publication Order Number:
NCP4353/D
NCP4353, NCP4354
VCC
V
CC
management
Current
Regulation
Sink only
OTA
ISNS
V
REFC
SW3
Power
RESET
I
BIASV
V
DD
V
DD
V
REF
DRIVE
Power
RESET
Sink only
OTA
V
REF
0.9 x V
REF
VSNS
Voltage
Regulation
I
DRIVEOFF
I
BIASV
Enabling
SW1
VCC
10%V
CC
Q
Q
S
R
Off Mode
Detection
OFFDET
GND
Power RESET
NCP4353A
VCC
V
CC
management
Power
RESET
I
BIASV
V
DD
SW3
V
DD
V
REF
OTA
V
REF
0.9 x V
REF
VSNS
DRIVE
Power
RESET
Sink only
Voltage
Regulation
I
DRIVEOFF
I
BIASV
Enabling
SW1
VCC
10%V
CC
OFFDET
Q
Q
S
R
Off Mode
Detection
VMIN
GND
Power RESET
Min Output
Voltage
V
REFM
NCP4353B
Figure 1. Simplified Block Diagrams NCP4353A and NCP4353B
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2
NCP4353, NCP4354
Current
Regulation
Sink only
VCC
V
CC
management
OTA
ISNS
V
REFC
SW3
Power
RESET
I
BIASV
V
DD
V
DD
V
REF
OTA
V
REF
0.9 x V
REF
VSNS
DRIVE
Power
RESET
Sink only
Voltage
Regulation
I
DRIVEOFF
I
BIASV
Enabling
SW1
VCC
10%V
CC
OFFDET
Q
Q
LED
S
R
Off Mode
Detection
SW2
1 kHz, 12% D.C.
Oscillator
Power RESET
VMIN
V
REFM
GND
Min Output
Voltage
NCP4354A
VCC
V
CC
management
Power
RESET
I
BIASV
V
DD
SW3
V
DD
V
REF
OTA
V
REF
0.9 x V
REF
VSNS
FBC
ON/OFF
I
DRIVEOFF
Power
RESET
Sink only
Voltage
Regulation
SW1
I
BIASV
Enabling
VCC
10%V
CC
OFFDET
Q
LED
Q
S
R
Off Mode
Detection
SW2
1 kHz, 12% D.C.
Oscillator
Power RESET
VMIN
V
REFM
GND
Min Output
Voltage
NCP4354B
Figure 2. Simplified Block Diagrams NCP4354A and NCP4354B
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3
NCP4353, NCP4354
PIN FUNCTION DESCRIPTION
NCP4353A
1
2
6
5
−
4
−
NCP4353B
1
2
6
5
4
−
−
NCP4354A
8
7
1
2
3
4
5
NCP4354B
8
7
1
2
3
−
4
Pin Name
VCC
GND
VSNS
OFFDET
VMIN
ISNS
LED
Supply voltage pin
Ground
Output voltage sensing pin, connected to output
voltage divider
OFF mode detection input. Voltage divider
provides adjustable off mode detection threshold
Minimum output voltage adjustment
Current sensing input for output current regulation,
connect it to shunt resistor in ground branch.
PWM LED driver output. Connected to LED cath-
ode with current define by external serial resist-
ance
Output of current sinking OTA amplifier or amplifi-
ers driving feedback optocoupler’s LED. Connect
here compensation network (networks) as well.
OFF mode current sink. This output keeps primary
control pin at low level in off mode.
Combination of FBC and ON/OFF pins
Description
−
−
−
6
FBC
−
3
−
3
−
6
5
−
ON/OFF
DRIVE
ABSOLUTE MAXIMUM RATINGS
Rating
Input Voltage
DRIVE, ON/OFF, FBC, LED Voltage
VSNS, ISNS, OFFDET, VMIN Voltage
LED Current
Junction Temperature
Storage Temperature
ESD Capability, Human Body Model (Note 1)
ESD Capability, Machine Model (Note 1)
Symbol
V
CC
V
DRIVE
, V
ONOFF
,
V
FBC
, V
LED
V
SNS
, V
ISNS
,
V
OFFDET
, V
MIN
I
LED
T
J
T
STG
ESD
HBM
ESD
MM
Value
−0.3
to 40
−0.3
to V
CC
+ 0.3
−0.3
to 10
10
−40
to 150
−60
to 150
2000
250
Unit
V
V
V
mA
°C
°C
V
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per JESD22−A114F
ESD Machine Model tested per JESD22−A115C
Latchup Current Maximum Rating tested per JEDEC standard: JESD78D.
ELECTRICAL CHARACTERISTICS
0°C
≤
T
J
≤
125°C; V
CC
= 15 V; unless otherwise noted. Typical values are at T
J
= +25°C.
Parameter
Maximum Operating Input
Voltage
VCC UVLO
V
CC
rising
V
CC
falling
VCC UVLO Hysteresis
V
CCUVLOHYS
Test Conditions
Symbol
V
CC
V
CCUVLO
3.3
2.3
0.8
3.5
2.5
1.0
Min
Typ
Max
36.0
3.7
2.7
V
Unit
V
V
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NCP4353, NCP4354
ELECTRICAL CHARACTERISTICS
0°C
≤
T
J
≤
125°C; V
CC
= 15 V; unless otherwise noted. Typical values are at T
J
= +25°C.
Parameter
Test Conditions
NCP4353A
Quiescent Current in Regulation
NCP4353B
NCP4354A
NCP4354B
Quiescent Current in OFF Mode
VOLTAGE CONTROL LOOP OTA
Transconductance
Reference Voltage
Sink current only
2.8 V
≤
V
CC
≤
36.0 V, T
J
= 25°C
2.8 V
≤
V
CC
≤
36.0 V, T
J
= 0
−
85°C
2.8 V
≤
V
CC
≤
36.0 V, T
J
= 0
−
125°C
Sink Current Capability
In regulation, V
DRIVE
or V
FBC
> 1.5 V
In OFF mode, V
DRIVE
or V
FBC
> 1.5 V
Inverting Input Bias Current
In regulation, V
SNS
= V
REF
In OFF mode, V
SNS
> 1.12 V
Inverting Input Bias Current
Threshold
In OFF mode
V
SNSBIASTH
I
BIASV
I
SINKV
gm
V
V
REF
1.244
1.240
1.230
2.5
1.2
−100
−13
1.07
−11
1.12
1.5
2.0
100
−10
1.17
1
1.250
1.250
1.250
1.256
1.264
1.270
mA
mA
nA
mA
V
S
V
V
SNS
< 1.12 V
I
CC,OFFmode
Symbol
I
CC
Min
Typ
101
82
118
95
90
Max
125
105
145
120
110
mA
Unit
mA
CURRENT CONTROL LOOP OTA (NCP435xA only)
Transconductance
Reference Voltage
Sink Current Capability
Inverting Input Bias Current
V
DRIVE
or V
FBC
> 1.5 V
I
SNS
= V
REFC
Sink current only
gm
C
V
REFC
I
SINKC
I
BIASC
V
REFM
Output change from logic high to logic low
V
MINH
V
OFFDETTH
1.47
V
OFFDETH
f
SWLED
D
LED
I
LED
= 5 mA
In OFF mode, V
DRIVE
or V
ONOFF
> 0.6 V
R
SW2
I
DRIVEOFF
140
10.0
60
2.5
−100
100
3
62.5
65
S
mV
mA
nA
MINIMUM VOLTAGE COMPARATOR (except NCP4353A)
Threshold Voltage
Hysteresis
355
377
40
400
mV
mV
OFF MODE DETECTION COMPARATOR
Threshold Value
2.5 V
≤
V
CC
≤
36.0 V
V
CC
= 15 V
Hysteresis
LED DRIVER (NCP4354x only)
Switching Frequency
Duty Cycle
Switch Resistance
OFF MODE CONTROL
Sink Current
160
180
mA
1
12.5
50
15.0
kHz
%
W
Output change from logic high to logic low
10% V
CC
1.50
40
1.53
mV
V
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