onsemi-NCP4352SNT1G
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NCP4352
Secondary Side SMPS ECO
Mode Controller for Low
Standby Power
The NCP4352 is a secondary side SMPS controller designed for use
in applications which require extremely low consumption. The device
is capable of detecting “light load” conditions and entering the power
supply into low consumption “ECO mode”.
During ECO mode, the output voltage decreases to an adjustable
level, allowing higher efficiency for light load condition while
keeping lower but regulated voltage supply. Once more energy is
required, the NCP4352 automatically switches back to the normal
mode regulation of output voltage.
During normal power supply operation, the NCP4352 provides
integrated voltage and current feedback regulation, replacing the need
for a shunt regulator. Feedback control is provided through
optocoupler to primary side SMPS controller.
MARKING
DIAGRAM
TSOP−6
SN SUFFIX
CASE 318G
E52AYW
G
G
1
1
E52 =
Specific Device Code
A
Y
W
G
= Assembly Location
=
Y
e
ar
= Work Week
The NCP4352 is available in TSOP−6 package.
= Pb−Free Package
Features
(Note: Microdot may be in either location)
•
Operating Input
V
o
ltage Range: 2.5 V to 36.0 V
•
Supply Current < 155
m
A
•
0.5% Reference
V
o
ltage Accuracy (T
= 25
°
C)
J
•
Constant
V
o
ltage Control Loop
PIN CONNECTIONS
VCC
GND
FBC
VSNS
•
Constant Current Control Loop
ECODET
ISNS
•
Designed for Use with Any Primary SMPS Controller
•
These are Pb−free Devices
Typical Applications
(
T
o
p View)
•
Offline Adapters for Notebooks, Game Stations and Printers
•
High Power AC−DC Converters for TVs, Set−Top Boxes, Monitors
ORDERING INFORMATION
this data sheet.
etc.
©
Semiconductor Components Industries, LLC, 2015
1
Publication Order Number:
August, 2015 − Rev. 0
NCP4352/D
NCP4352
Current
Regulation
ISNS
VCC
OTA
Sink only
V
CC
management
V
REFC
I
BIASV
Power
RESET
SW3
V
DD
V
DD
V
REF
VSNS
FBC
OTA
Sink only
Voltage
Regulation
V
REF
0.9 x V
REF
I
BIASV
Enabling
VCC
ECO Mode
Detection
Q
Q
S
R
10%V
CC
ECODET
GND
Power RESET
Figure 1. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
NCP4352
Pin Name
VCC
Description
1
2
6
5
4
3
Supply voltage pin
Ground
Output voltage sensing pin, connected to output voltage divider
GND
VSNS
ECODET
ISNS
ECO mode detection input. Voltage divider provides adjustable ECO mode detection threshold
Current sensing input for output current regulation, connect it to shunt resistor in ground branch.
FBC
Output of current sinking OTA amplifiers driving feedback optocoupler’s LED. Connect here com-
pensation network (networks) as well.
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
V
Input Voltage
V
CC
−0.3 to 40.0
FBC Voltage
V
FBC
−0.3 to V
+ 0.3
V
CC
VSNS, ISNS, ECODET Voltage
Junction
T
e
mperature
V
,V
,V
−0.3 to 10.0
315
V
SNS ISNS ECODET
R
°
C/W
°
C
°
C
V
θ
JA
J
T
−40 to 150
−60 to 150
2000
Storage
T
e
mperature
T
STG
ESD
HBM
ESD
250
V
MM
ESD
1000
V
CDM
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
2
1. 50
mm ,
1.0 oz. Copper spreader.
2. This
device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per JESD22A−114F
ESD Charged Device Model tested per JESD22−C101F
Latch−up Current Maximum Rating tested per JEDEC standard: JESD78 class I.
2
NCP4352
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min
Max
36.0
125
Unit
V
Maximum Operating Input Voltage
Operating Junction
T
e
mperature
V
CCMAX
T
J
−40
°
C
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
Table 4. ELECTRICAL CHARACTERISTICS
−40
°
C
≤
T
≤
125
°
C; V
= 15 V; unless otherwise noted. Typical values are at T
= +25
°
C.
J
CC
J
Parameter
Test Conditions
Symbol
Min
3.3
2.3
0.8
Typ
3.5
2.5
1.0
105
90
Max
3.7
Unit
VCC UVLO
V
V
rising
falling
V
V
CC
CCUVLO
2.7
CC
VCC UVLO Hysteresis
Quiescent Current
V
V
CCUVLOHYS
V
V
V
= 2
V
,
I
n regulation
I
140
125
155
m
A
ECODET
ECODET
ECODET
CC
= 0
V
, V
< V
SNSBIASTH
SNS
= 1
V
,
I
n regulation
120
VOLTAGE CONTROL LOOP OTA
Transconductance
Sink current only
gm
1
S
V
V
Reference Voltage
2.8 V
≤
V
≤
36.0
V
, T
=
2
5
°
C
V
REF
1.244
1.230
2.5
1.250
1.250
3.0
1.256
1.270
3.5
CC
J
2.8 V
≤
V
≤
36.0
V
, T
= 0 − 125
°
C
CC
J
Sink Current Capability
V
> 1.5
V
, V
= 2 V
I
SINKV
mA
FBC
FBC
SNS
SNS
ECODET
V
V
V
V
> 1.5
V
, V
= 1 V
= 2 V
1.2
1.5
2.0
ECODET
Inverting Input Bias Current
= V
> V
, V
I
−100
−35
100
nA
m
A
V
REF ECODET
BIASV
, V
= 1 V
−31
−27
SNSBIASTH
ECODET
Inverting Input Bias Current
Threshold
= 1 V
V
1.07
1.12
1.17
ECODET
SNSBIASTH
CURRENT CONTROL LOOP OTA
Transconductance
Sink current only
gm
3
S
C
Reference Voltage
V
60.0
2.5
62.5
3.0
65.0
3.5
mV
mA
nA
REFC
Sink Current Capability
Inverting Input Bias Current
V
V
> 1.5
V
, V
= 2 V
I
SINKC
FBC
ECODET
= V
I
BIASC
−100
100
ISNS
REFC
ECO MODE DETECTION COMPARATOR
Threshold Value
2.5 V
≤
V
≤
36.0 V
V
10% V
CC
V
CC
ECODETTH
V
= 15 V
1.47
1.50
40
1.53
CC
Hysteresis
Output change from logic high to logic low
V
mV
ECODETH
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
3
NCP4352
TYPICAL CHARACTERISTICS
1.29
1.28
1.27
1.26
1.25
1.24
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.23
1.22
−40 −20
0
20
40
60
80
100 120
100 120
100 120
0
6
12
18
(V)
24
30
36
T (
°
C)
J
V
CC
Figure 2. V
REF
at V
CC
= 15 V
Figure 3. V
REF
at T
J
= 25
5
C
64.5
64.0
63.5
63.0
62.5
64.5
64.0
63.5
63.0
62.5
62.0
61.5
62.0
61.5
61.0
60.5
61.0
60.5
−40 −20
0
20
40
60
80
0
6
12
18
(V)
24
30
36
T (
°
C)
J
V
CC
Figure 4. V
REFC
at V
CC
= 15 V
Figure 5. V
REFC
at T
J
= 25
5
C
3.8
3.6
3.4
3.2
3.0
2.8
1.53
1.52
1.51
1.50
1.49
V
CCUVLO_R
1.48
1.47
2.6
2.4
V
CCUVLO_F
−40 −20
0
20
40
60
80
−40 −20
0
20
40
60
80
100 120
T (
°
C)
J
T (
°
C)
J
Figure 6. V
CCUVLO
Rise and Fall Threshold
Figure 7. V
ECODETTH
at V
CC
= 15 V
4
NCP4352
TYPICAL CHARACTERISTICS
0.110
0.108
0.106
0.104
0.102
0.100
0.098
0.096
0.094
−27
−28
−29
−30
−31
−32
−33
−34
−35
0.092
0.090
0
10
20
30
40
−40 −20
0
20
40
60
80
100 120
V
CC
(V)
T (
°
C)
J
Figure 8. V
ECODETTH
/V
CC
Ratio at T
J
= 25
5
C
Figure 9. I
BIASV
at V
CC
= 15
V
,
V
SNS
SNSBIASTH
, V
ECODET
< 10% V
CC
>
V
140
130
120
110
100
90
140
130
120
110
100
90
80
70
80
70
−40 −20
0
20
40
60
80
100 120
0
6
12
18
(V)
24
30
36
T (
°
C)
J
V
CC
Figure 10. I
CC
in Regulation, V
CC
= 15
V
,
ECODET
= 2 V
Figure 11. I
CC
in Regulation, T
J
= 25
5
C,
V
V
ECODET
> 10% V
CC
160
150
160
150
140
130
120
110
100
90
140
130
120
110
100
90
80
70
80
70
−40 −20
0
20
40
60
80
100 120
0
6
12
18
(V)
24
30
36
T (
°
C)
J
V
CC
Figure 12. I
CC
in ECO Mode, V
CC
= 15
V
,
ECODET
= 1
V
,
V
SNS
= V
REF
Figure 13. I
CC
in ECO Mode, T
J
= 25
5
C,
V
V
ECODET
= 1
V
,
V
SNS
= V
REF
5
NCP4352
TYPICAL CHARACTERISTICS
120
110
100
90
120
110
100
90
80
80
70
70
60
50
60
50
−40 −20
0
20
40
60
80
100 120
0
6
12
18
(V)
24
30
36
T (
°
C)
J
V
CC
Figure 14. I
CC
in ECO Mode, V
CC
= 15
V
,
ECODET
= 0
V
,
V
SNS
< V
SNSBIASTH
Figure 15. I
CC
in ECO Mode, T
J
= 25
5
C,
V
V
ECODET
= 1
V
,
V
SNS
< V
SNSBIASTH
3.5
3.4
3.3
3.2
3.1
3.0
2.0
1.9
1.8
1.7
1.6
1.5
1.4
2.9
2.8
2.7
1.3
1.2
2.6
2.5
−40 −20
0
20
40
60
80
100 120
−40 −20
0
20
40
60
80
100 120
T (
°
C)
J
T (
°
C)
J
Figure 16. Voltage OTA Current Sink Capability
in Normal Mode, V
CC
= 15
V
,
V
ECODET
= 2 V
Figure 17. Voltage OTA Current Sink Capability
in ECO Mode, V
CC
= 15
V
,
V
ECODET
= 1 V
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
−40 −20
0
20
40
60
80
100 120
T (
°
C)
J
Figure 18. Current OTA Current Sink
Capability in Normal Mode, V
CC
= 15
V
,
V
ECODET
= 2 V
6
NCP4352
APPLICATION INFORMATION
A typical application circuits for NCP4352 series is
description table.
controller. This schematic uses one single optocoupler for
both voltage and current regulation functions.
Those schematics provide all possible functionalities.
Current regulation point is set to current given by
V
REFC
R11
I
OUTLIM
+
(eq. 2)
ECO Mode Detection
ECO mode operation is advantageous for ultra low output
current condition. The reduced output voltage with very
long skip off time and the low power mode of the whole
regulation system reduces strongly the overall consumption.
The output voltage is reduced to a second regulation point
in ECO mode. When output voltage decreases, the overall
output and regulation power are reduced.
The ECO mode detection is based on comparison of
output voltage and voltage loaded with fixed resistances
(D2, R6, R7, R8 and C2).
voltage is loaded with very low current, primary controller
goes into skip mode (primary controller stops switching for
some time). While output power is reduced, thanks to the
serial resistance R6, the voltage on capacitor C2 provides a
voltage proportional to output power, allowing power level
detection.
Power Supply
The NCP4352 is designed to operate from a single supply
up to 36
V
.
I
t starts to operate when VCC voltage reaches
3.5 V and stops when VCC voltage drops below 2.5
V
.
V
CC
can be supplied by direct connection to the VOUT voltage
of the power supply. It is recommended to add a RC filter
(R1 and C3) in series from VOUT to VCC pin to reduce
voltage spikes and drops that are produced at the converter’s
output capacitors. Recommended values for this filter are
220
Ω
and 1
m
F.
Voltage Regulation Path
The output voltage is detected on the VSNS pin by the R3
and R4 voltage divider. This voltage is compared with the
internal precise voltage reference. The voltage difference is
amplified by gm
of the transconductance amplifier. The
V
Ones ECODET pin voltage goes lower than V
ECODETTH
amplifier output current is connected to the FBC pin. The
compensation network is also connected to this pin to
provide frequency compensation for the voltage regulation
path. This FBC pin drives an optocoupler to prove the
secondary side regulation. The optocoupler is supplied via
direct connection to VOUT line through resistor R1.
Regulation information is transferred through the
optocoupler to the primary side controller where its FB pin
is usually pulled down to reduce energy transferred to
secondary output.
(this threshold is derived from V
= V
), ECO mode is
OUT
CC
detected. This means that ECO mode is not activated until
falling edge comes at ECODET pin.
To reduce output voltage on C1 down to the new
regulation point, the current I
injected into VSNS pin
BIASV
provides the requested offset (VSNS voltage is higher than
). This offset, defined by R4, R5 and the internal
V
REF
current source, allows keeping the same output voltage
resistances divider defined for the normal mode. Reduced
output voltage in ECO mode can be computed by
R3
)
R4
(eq. 1)
V
OUT
+
V
REF
V
REF
)
(R4
)
R5)
@
I
BIASV
R4
(eq. 3)
I
R3
+
R4
Current Regulation Path
The output current is sensed by the shut resistor R11 in
series with the load.
V
o
ltage drop on R11 is compared with
ǒ
Ǔ
@
R4
V
OUT_ECO
+
I
R3
@
R3
)
I
R3
*
I
BIASV
The sink current on primary FB pin is so adjusted to keep
primary controller FB in line with the new working point
with reduced output voltage.
Primary IC should be kept supplied from auxiliary
winding of the transformer despite overall voltage
reduction. This may ask for serial voltage regulator to avoid
over voltage in normal mode.
internal precise voltage reference
transconductance amplifier input.
V
REFC
at ISNS
V
o
ltage difference is amplified by gm
to output current
C
of amplifier, connected to FBC pin. Compensation network
is connected between this pin and ISNS input to provide
frequency compensation for current regulation path.
Current regulation OTA is activated only in normal mode,
during ECO mode is turned−off to save energy. It doesn’t
make any issue, because ECO mode is activated just in case
of light load so current regulation path is not needed.
If output power increases such that ECODET pin voltage
is higher than 10% of V
, the ECO mode is ended and
CC
regulation is switched back to original normal mode. The IC
also starts in normal mode after UVLO event.
7
NCP4352
R13
ECO Supply
D2
D1
VOUT
R11
C1
C2
R3
Current
Regulation
ISNS
VCC
OTA
Sink only
V
CC
R12
V
REFC
management
I
BIASV
Power
RESET
C4
C3
R9
SW3
V
DD
V
DD
R
1
0
V
REF
R6
Feedback
Opto
OTA
VSNS
Sink only
FBC
R1
Voltage
Regulation
V
REF
R7
R4
0.9 x V
REF
I
BIASV
Enabling
VCC
ECO
M
o
de
Detection
Q
Q
S
R
10%V
CC
ECODET
GND
Power RESET
R8
Figure 19. Typical Application Schematic for ECO Mode NCP4352
D3
VCC
R6
D2
D1
D4
D5
R1
R10 C5
R13
VIN
C1
C2
~
C6
VOUT
R3
R9 C4
FBC
C3
VCC
ISNS
T1
OPT
O
1
HV
VCC
DRV
R2
R
1
2
R4
R5
R11
VSNS
VCC
CS
FB
R14
R7
R8
C7
GND
ECODET
C8
GND
ECO Mode
Figure 20. Typical Application Schematic with Flyback and NCP4352
8
NCP4352
Normal operation
Skip
ECO mode
Primary
Controller
Activity
Very low or no load detected,
ECO mode activated
V
ECODET
10% V
CC
I
OUT
Figure 21. ECO Mode Detection
ORDERING INFORMATION
Device
†
Marking
E52
Package
Shipping
NCP4352SNT1G
TSOP−6
3000 /
T
a
pe & Reel
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our
T
a
pe and Reel Packaging
Specifications Brochure, BRD8011/D.
9
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
TSOP
−
6
CASE 318G
−
02
ISSUE V
1
DATE 12 JUN 2012
SCALE 2:1
NOTES:
D
1. DIMENSIONING
AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING
DIMENSION: MILLIMETERS.
H
3. MAXIMUM
LEAD THICKNESS INCLUDES LEAD FINISH. MINIMUM
LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.
4. DIMENSIONS
D AND E1 DO NOT INCLUDE MOLD FLASH,
PROTRUSIONS, OR GATE BURRS. MOLD FLASH, PROTRUSIONS, OR
GATE BURRS SHALL NOT EXCEED 0.15 PER SIDE. DIMENSIONS D
AND E1 ARE DETERMINED AT DATUM H.
6
1
5
4
L2
GAUGE
PLANE
E1
E
5. PIN
ONE INDICATOR MUST BE LOCATED IN THE INDICATED ZONE.
2
3
L
MILLIMETERS
SEATING
C
M
NOTE 5
DIM
A
A1
b
c
D
E
E1
e
MIN
0.90
0.01
0.25
0.10
2.90
2.50
1.30
0.85
0.20
NOM
1.00
MAX
1.10
0.10
0.50
0.26
3.10
3.00
1.70
1.05
0.60
PLANE
b
DETAIL Z
e
0.06
0.38
0.18
3.00
c
2.75
A
0.05
1.50
0.95
L
0.40
A1
L2
M
0.25 BSC
−
DETAIL Z
0
°
1
0
°
STYLE 1:
STYLE 2:
PIN 1.
EMITTER 2
2. BASE
1
STYLE 3:
PIN 1.
ENABLE
2. N/C
STYLE 4:
PIN 1.
N/C
2. V
in
STYLE 5:
PIN 1.
EMITTER 2
2. BASE
2
STYLE 6:
PIN 1.
DRAIN
2. DRAIN
PIN 1.
COLLECTOR
2. COLLECTOR
3. BASE
3. GATE
3. COLLECTOR
1
4. EMITTER
1
5. BASE
2
3. R
BOOST
4. Vz
5. V
in
6. V
out
3. NOT
USED
4. GROUND
5. ENABLE
6. LOAD
3. COLLECTOR
1
4. EMITTER
1
5. BASE
1
4. SOURCE
5. DRAIN
6. DRAIN
4. EMITTER
5. COLLECTOR
6. COLLECTOR
6. COLLECTOR
2
6. COLLECTOR
2
STYLE 7:
STYLE 8:
PIN 1.
Vbus
2. D(in)
STYLE 9:
STYLE 10:
PIN 1.
D(OUT)+
2. GND
STYLE 11:
STYLE 12:
PIN 1.
I/O
2. GROUND
3. I/O
PIN 1.
COLLECTOR
2. COLLECTOR
3. BASE
PIN 1.
LOW VOLTAGE GATE
2. DRAIN
PIN 1.
SOURCE 1
2. DRAIN
2
3. D(in)+
4. D(out)+
5. D(out)
6. GND
3. SOURCE
3. D(OUT)
−
4. D(IN)
−
5. VBUS
6. D(IN)+
3. DRAIN
2
4. N/C
5. COLLECTOR
6. EMITTER
4. DRAIN
4. SOURCE
2
5. GATE
1
4. I/O
5. DRAIN
5. VCC
6. I/O
6. HIGH
VOLTAGE GATE
6. DRAIN
1/GATE 2
STYLE 13:
STYLE 14:
PIN 1.
ANODE
2. SOURCE
3. GATE
STYLE 15:
PIN 1.
ANODE
2. SOURCE
3. GATE
STYLE 16:
STYLE 17:
PIN 1.
EMITTER
2. BASE
PIN 1.
GATE 1
2. SOURCE
2
3. GATE
2
PIN 1.
ANODE/CATHODE
2. BASE
3. EMITTER
3. ANODE/CATHODE
4. ANODE
5. CATHODE
6. COLLECTOR
4. DRAIN
2
5. SOURCE
1
6. DRAIN
1
4. CATHODE/DRAIN
4. DRAIN
4. COLLECTOR
5. ANODE
5. CATHODE/DRAIN
6. CATHODE/DRAIN
5. N/C
6. CATHODE
6. CATHODE
GENERIC
MARKING DIAGRAM*
RECOMMENDED
SOLDERING FOOTPRINT*
6X
0.60
XXXAYW
G
XXX M
G
G
G
1
1
6X
0.95
3.20
IC
STANDARD
XXX =
Specific Device Code
XXX =
Specific Device Code
A
Y
W
G
=Assembly Location
=
Y
e
ar
= Work Week
M
G
= Date Code
= Pb
−
Free Package
0.95
PITCH
= Pb
−
Free Package
DIMENSIONS: MILLIMETERS
*For additional information on our Pb
−
Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting
T
e
chniques Reference Manual, SOLDERRM/D.
*This information is generic. Please refer to device data sheet
for actual part marking. Pb
−
Free indicator, “G” or microdot “
G
”, may or may not be present.
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions
are uncontrolled
except when stamped
“CONTROLLED COPY” in red.
DOCUMENT NUMBER:
DESCRIPTION:
98ASB14888C
TSOP
−
6
PAGE 1 OF 1
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