ON NCP4352 Secondary side smps eco mode controller Datasheet

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.
The NCP4352 is available in TSOP−6 package.
Features
•
•
•
•
•
•
•
Operating Input Voltage Range: 2.5 V to 36.0 V
Supply Current < 155 mA
±0.5% Reference Voltage Accuracy (TJ = 25°C)
Constant Voltage Control Loop
Constant Current Control Loop
Designed for Use with Any Primary SMPS Controller
These are Pb−free Devices
TSOP−6
SN SUFFIX
CASE 318G
1
E52AYWG
G
1
E52
A
Y
W
G
= Specific Device Code
= Assembly Location
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
• Offline Adapters for Notebooks, Game Stations and Printers
• High Power AC−DC Converters for TVs, Set−Top Boxes, Monitors
etc.
August, 2015 − Rev. 0
MARKING
DIAGRAM
(Note: Microdot may be in either location)
Typical Applications
© Semiconductor Components Industries, LLC, 2015
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VCC
VSNS
GND
ECODET
FBC
ISNS
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of
this data sheet.
1
Publication Order Number:
NCP4352/D
NCP4352
Current
Regulation
VCC
VCC
management
I BIASV
Power
RESET
VDD
ISNS
OTA
Sink only
VREFC
SW3
V DD
VREF
FBC
VSNS
OTA
Sink only
Voltage
Regulation
VREF
0.9 x VREF
IBIASV
Enabling
Q
S
Q
R
VCC
ECO Mode
Detection
10%VCC
ECODET
GND
Power RESET
Figure 1. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
NCP4352
Pin Name
1
VCC
Supply voltage pin
Description
2
GND
Ground
6
VSNS
Output voltage sensing pin, connected to output voltage divider
5
ECODET
4
ISNS
Current sensing input for output current regulation, connect it to shunt resistor in ground branch.
3
FBC
Output of current sinking OTA amplifiers driving feedback optocoupler’s LED. Connect here compensation network (networks) as well.
ECO mode detection input. Voltage divider provides adjustable ECO mode detection threshold
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input Voltage
VCC
−0.3 to 40.0
V
FBC Voltage
VFBC
−0.3 to VCC + 0.3
V
VSNS,VISNS,VECODET
−0.3 to 10.0
V
RθJA
315
°C/W
TJ
−40 to 150
°C
VSNS, ISNS, ECODET Voltage
Thermal Resistance – Junction−to−Air (Note 1)
Junction Temperature
TSTG
−60 to 150
°C
ESD Capability, Human Body Model (Note 1)
ESDHBM
2000
V
ESD Capability, Machine Model (Note 1)
ESDMM
250
V
ESD Capability, Charged Device Model (Note 1)
ESDCDM
1000
V
Storage Temperature
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.
1. 50 mm2, 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.
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NCP4352
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Maximum Operating Input Voltage
Min
Max
VCCMAX
Operating Junction Temperature
TJ
Unit
36.0
V
125
°C
−40
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 ≤ TJ ≤ 125°C; VCC = 15 V; unless otherwise noted. Typical values are at TJ = +25°C.
Test Conditions
Parameter
VCC UVLO
VCC rising
Symbol
Min
Typ
Max
Unit
VCCUVLO
3.3
3.5
3.7
V
2.3
2.5
2.7
VCC falling
VCC UVLO Hysteresis
Quiescent Current
VCCUVLOHYS
0.8
ICC
VECODET = 2 V, In regulation
1.0
V
105
140
VECODET = 0 V, VSNS < VSNSBIASTH
90
125
VECODET = 1 V, In regulation
120
155
mA
VOLTAGE CONTROL LOOP OTA
Transconductance
Sink current only
gmV
Reference Voltage
2.8 V ≤ VCC ≤ 36.0 V, TJ = 25°C
VREF
2.8 V ≤ VCC ≤ 36.0 V, TJ = 0 − 125°C
Sink Current Capability
ISINKV
VFBC > 1.5 V, VECODET = 2 V
VFBC > 1.5 V, VECODET = 1 V
Inverting Input Bias Current
IBIASV
VSNS = VREF, VECODET = 2 V
VSNS > VSNSBIASTH, VECODET = 1 V
Inverting Input Bias Current
Threshold
VECODET = 1 V
VSNSBIASTH
1
S
1.244
1.250
1.256
1.230
1.250
1.270
2.5
3.0
3.5
1.2
1.5
2.0
−100
V
mA
100
nA
−35
−31
−27
mA
1.07
1.12
1.17
V
CURRENT CONTROL LOOP OTA
Transconductance
Sink current only
gmC
Reference Voltage
VREFC
3
60.0
62.5
3.0
Sink Current Capability
VFBC > 1.5 V, VECODET = 2 V
ISINKC
2.5
Inverting Input Bias Current
VISNS = VREFC
IBIASC
−100
S
65.0
mV
3.5
mA
100
nA
ECO MODE DETECTION COMPARATOR
Threshold Value
2.5 V ≤ VCC ≤ 36.0 V
VECODETTH
VCC = 15 V
Hysteresis
1.47
Output change from logic high to logic low
VECODETH
V
10% VCC
1.50
40
1.53
mV
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.
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NCP4352
1.29
1.28
1.28
1.27
1.27
1.26
1.25
1.25
1.24
1.23
1.23
1.22
−20
0
20
40
60
80
0
120
100
12
18
24
VCC (V)
Figure 2. VREF at VCC = 15 V
Figure 3. VREF at TJ = 255C
64.5
64.0
64.0
63.5
63.5
63.0
62.5
62.0
30
36
30
36
63.0
62.5
62.0
61.5
61.5
61.0
61.0
60.5
−20
0
20
40
60
80
100
0
120
6
12
18
24
TJ (°C)
VCC (V)
Figure 4. VREFC at VCC = 15 V
Figure 5. VREFC at TJ = 255C
3.8
1.53
3.6
VCCUVLO_R
1.52
VECODETTH (V)
3.4
3.2
3.0
2.8
2.6
2.4
−40
6
TJ (°C)
64.5
60.5
−40
VCC (V)
1.26
1.24
1.22
−40
VREFC (mV)
VREF (V)
1.29
VREFC (mV)
VREF (V)
TYPICAL CHARACTERISTICS
0
20
40
60
1.50
1.49
1.48
VCCUVLO_F
−20
1.51
80
100
1.47
−40
120
−20
0
20
40
60
80
100
TJ (°C)
TJ (°C)
Figure 6. VCCUVLO Rise and Fall Threshold
Figure 7. VECODETTH at VCC = 15 V
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120
NCP4352
TYPICAL CHARACTERISTICS
0.110
−27
0.108
−28
−29
0.104
IBIASV (mA)
VECODETTH/VCC (−)
0.106
0.102
0.100
0.098
−32
−33
−34
0.092
0.090
0
10
20
30
−35
−40 −20
40
40
60
80
100
Figure 8. VECODETTH/VCC Ratio at TJ = 255C
Figure 9. IBIASV at VCC = 15 V, VSNS >
VSNSBIASTH, VECODET < 10% VCC
130
130
120
120
ICC (mA)
140
110
100
120
110
100
90
90
80
80
70
−20
0
20
40
60
80
100
0
120
6
12
18
24
30
TJ (°C)
VCC (V)
Figure 10. ICC in Regulation, VCC = 15 V,
VECODET = 2 V
Figure 11. ICC in Regulation, TJ = 255C,
VECODET > 10% VCC
160
160
150
150
140
140
130
130
120
110
36
120
110
100
100
90
90
80
80
70
−40
20
TJ (°C)
140
70
−40
0
VCC (V)
ICC (mA)
ICC (mA)
−31
0.096
0.094
ICC (mA)
−30
70
−20
0
20
40
60
80
100
0
120
6
12
18
24
30
TJ (°C)
VCC (V)
Figure 12. ICC in ECO Mode, VCC = 15 V,
VECODET = 1 V, VSNS = VREF
Figure 13. ICC in ECO Mode, TJ = 255C,
VECODET = 1 V, VSNS = VREF
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36
NCP4352
120
120
110
110
100
100
ICC (mA)
ICC (mA)
TYPICAL CHARACTERISTICS
90
80
80
70
70
60
60
50
−40 −20
50
0
20
40
60
80
100
0
120
6
12
18
24
30
TJ (°C)
VCC (V)
Figure 14. ICC in ECO Mode, VCC = 15 V,
VECODET = 0 V, VSNS < VSNSBIASTH
Figure 15. ICC in ECO Mode, TJ = 255C,
VECODET = 1 V, VSNS < VSNSBIASTH
3.5
2.0
3.4
1.9
3.3
36
1.8
ISINKV (mA)
3.2
3.1
3.0
2.9
2.8
1.7
1.6
1.5
1.4
2.7
2.6
2.5
−40
1.3
−20
0
20
40
60
80
100
1.2
−40
120
−20
0
20
40
60
80
100
120
TJ (°C)
TJ (°C)
Figure 16. Voltage OTA Current Sink Capability
in Normal Mode, VCC = 15 V, VECODET = 2 V
Figure 17. Voltage OTA Current Sink Capability
in ECO Mode, VCC = 15 V, VECODET = 1 V
3.5
3.4
3.3
3.2
ISINKC (mA)
ISINKV (mA)
90
3.1
3.0
2.9
2.8
2.7
2.6
2.5
−40
−20
0
20
40
60
80
100
TJ (°C)
Figure 18. Current OTA Current Sink
Capability in Normal Mode, VCC = 15 V,
VECODET = 2 V
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120
NCP4352
APPLICATION INFORMATION
Current regulation point is set to current given by
Equation 2.
A typical application circuits for NCP4352 series is
shown in Figure 19. Pin functions are available in pin
description table.
Figure 20 shows possible connection to flyback primary
controller. This schematic uses one single optocoupler for
both voltage and current regulation functions.
Those schematics provide all possible functionalities.
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).
Figure 21 shows detection waveforms. When output
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.
Ones ECODET pin voltage goes lower than VECODETTH
(this threshold is derived from VOUT = VCC), ECO mode is
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 IBIASV injected into VSNS pin
provides the requested offset (VSNS voltage is higher than
VREF). This offset, defined by R4, R5 and the internal
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
Equation 3.
Power Supply
The NCP4352 is designed to operate from a single supply
up to 36 V. It starts to operate when VCC voltage reaches
3.5 V and stops when VCC voltage drops below 2.5 V. VCC
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 mF.
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 gmV of the transconductance amplifier. The
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.
The output voltage can be computed by Equation 1.
V OUT + V REF R3 ) R4
R4
V REFC
R11
(eq. 1)
I R3 +
Current Regulation Path
V REF ) (R4 ) R5) @ I BIASV
R4
(eq. 3)
V OUT_ECO + I R3 @ R3 ) ǒI R3 * I BIASVǓ @ R4
The output current is sensed by the shut resistor R11 in
series with the load. Voltage drop on R11 is compared with
internal precise voltage reference VREFC at ISNS
transconductance amplifier input.
Voltage difference is amplified by gmC to output current
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.
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.
If output power increases such that ECODET pin voltage
is higher than 10% of VCC, the ECO mode is ended and
regulation is switched back to original normal mode. The IC
also starts in normal mode after UVLO event.
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NCP4352
R13
D2
ECO Supply
D1
C2
C1
VOUT
R3
Current
Regulation
VCC
ISNS
OTA
Sink only
VCC
management
C4
C3
R10
R9
VDD
R12
VREFC
IBIASV
Power
RESET
SW3
VDD
R11
VREF
R6
Feedback
Opto
Sink only
FBC
R1
OTA
VSNS
Voltage
Regulation
VREF
R7
R4
0.9 x VREF
IBIASV
Enabling
Q
S
Q
R
VCC
ECO Mode
Detection
10%VCC
ECODET
GND
R8
Power RESET
Figure 19. Typical Application Schematic for ECO Mode NCP4352
D3
VCC
R6
D2
D1
VIN
D4
R13
~
C1
C6
R1
R10 C5
C2
D5
R9
VOUT
R3
C4
C3
HV
VCC
VCC
DRV
T1
FBC
OPTO 1
VCC
ISNS
R2
R5
R14
C7
R12
R11
VSNS
CS
R4
FB
GND
R7
ECODET
C8
GND
ECO Mode
Figure 20. Typical Application Schematic with Flyback and NCP4352
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8
R8
NCP4352
Primary
Controller
Activity
Normal operation
Skip
ECO mode
Very low or no load detected,
ECO mode activated
VECODET
10% VCC
IOUT
Figure 21. ECO Mode Detection
ORDERING INFORMATION
Device
NCP4352SNT1G
Marking
Package
Shipping†
E52
TSOP−6
(Pb−Free)
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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9
NCP4352
PACKAGE DIMENSIONS
TSOP−6
CASE 318G−02
ISSUE V
D
H
6
E1
5
ÉÉÉ
1
NOTE 5
2
4
L2
GAUGE
PLANE
E
3
L
M
b
SEATING
PLANE
DETAIL Z
e
0.05
C
A
c
A1
DETAIL Z
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
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.
5. PIN ONE INDICATOR MUST BE LOCATED IN THE INDICATED ZONE.
DIM
A
A1
b
c
D
E
E1
e
L
L2
M
RECOMMENDED
SOLDERING FOOTPRINT*
MIN
0.90
0.01
0.25
0.10
2.90
2.50
1.30
0.85
0.20
MILLIMETERS
NOM
MAX
1.00
1.10
0.06
0.10
0.38
0.50
0.18
0.26
3.00
3.10
2.75
3.00
1.50
1.70
0.95
1.05
0.40
0.60
0.25 BSC
−
10°
0°
6X
0.60
6X
3.20
0.95
0.95
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and the
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.
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or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets
and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
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