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 TLV431A, TLV431B Low Voltage Precision Adjustable Shunt Regulator
The TLV431A and B series are precision low voltage shunt regulators that are programmable over a wide voltage range of 1.24 V to 16 V. The TLV431A series features a guaranteed reference accuracy of 1.0% at 25C and 2.0% over the entire industrial temperature range of -40C to 85C. For TLV431B series, the accuracy is even higher, it's 0.5% and 1.0% respectively. These devices exhibit a sharp low current turn-on characteristic with a low dynamic impedance of 0.20 W over an operating current range of 100 mA to 20 mA. This combination of features makes this series an excellent replacement for zener diodes in numerous applications circuits that require a precise reference voltage. When combined with an optocoupler, the TLV431A/B can be used as an error amplifier for controlling the feedback loop in isolated low output voltage (3.0 V to 3.3 V) switching power supplies. These devices are available in e c o n o m i c a l T O -9 2 -3 a n d m i c r o s i z e T S O P -5 a n d SOT-23-3 packages.
Features http://onsemi.com
TO-92-3-3 LP SUFFIX CASE 29 1 2
3
4 5 1 2 3
TSOP-5 SN SUFFIX CASE 483
* Programmable Output Voltage Range of 1.24 V to 16 V * Voltage Reference Tolerance "1.0% for A Series and * * * * *
"0.5% for B Series Sharp Low Current Turn-On Characteristic Low Dynamic Output Impedance of 0.20 W from 100 mA to 20 mA Wide Operating Current Range of 50 mA to 20 mA Micro Miniature TSOP-5, SOT-23-3 and TO-92-3 Packages Pb-Free Packages are Available
3 1 2
SOT-23-3 SN1 SUFFIX CASE 318
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.
Applications
* Low Output Voltage (3.0 V to 3.3 V) Switching Power Supply * * * * *
Error Amplifier Adjustable Voltage or Current Linear and Switching Power Supplies Voltage Monitoring Current Source and Sink Circuits Analog and Digital Circuits Requiring Precision References Low Voltage Zener Diode Replacements
DEVICE MARKING INFORMATION AND PIN CONNECTIONS
See general marking information in the device marking section on page 11 of this data sheet.
Reference (R) + - 1.24 Vref
Cathode (K)
Anode (A)
Figure 1. Representative Block Diagram
Semiconductor Components Industries, LLC, 2005
January, 2005 - Rev. 7
1
Publication Order Number: TLV431A/D
TLV431A, TLV431B
Cathode (K)
Cathode (K)
Reference (R)
Reference (R)
Anode (A) Device Symbol Anode (A) The device contains 13 active transistors.
Figure 2. Representative Device Symbol and Schematic Diagram
MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted)
Rating Cathode to Anode Voltage Cathode Current Range, Continuous Reference Input Current Range, Continuous Thermal Characteristics LP Suffix Package, TO-92-3 Package Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case SN Suffix Package, TSOP-5 Package Thermal Resistance, Junction-to-Ambient SN1 Suffix Package, SOT-23-3 Package Thermal Resistance, Junction-to-Ambient Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Symbol VKA IK Iref Value 18 -20 to 25 *0.05 to 10 Unit V mA mA C/W RqJA RqJC RqJA RqJA TJ TA Tstg 178 83 226 491 150 *40 to 85 *65 to 150 C C C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL-STD-883, Method 3015. Machine Model Method 200 V. T J(max) * T A RqJA
P
D
+
RECOMMENDED OPERATING CONDITIONS
Condition Cathode to Anode Voltage Cathode Current Symbol VKA IK Min Vref 0.1 Max 16 20 Unit V mA
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TLV431A, TLV431B
ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted)
TLV431A Characteristic Reference Voltage (Figure 3) (VKA = Vref, IK = 10 mA, TA = 25C) (TA = Tlow to Thigh, Note 1) Reference Input Voltage Deviation Over Temperature (Figure 3) (VKA = Vref, IK= 10 mA, TA = Tlow to Thigh, Note 1) Ration of Reference Input Voltage Change to Cathode Voltage Change (Figure 4) (VKA = Vref to 16 V, IK= 10 mA) Reference Terminal Current (Figure 4) (IK = 10 mA, R1 = 10 kW, R2 = open) Reference Input Current Deviation Over Temperature (Figure 4) (IK = 10 mA, R1 = 10 kW, R2 = open, Notes 1, 2) Minimum Cathode Current for Regulation (Figure 3) Off-State Cathode Current (Figure 5) (VKA = 6.0 V, Vref = 0) (VKA = 16 V, Vref = 0) Dynamic Impedance (Figure 3) (VKA = Vref, IK =0.1 mA to 20 mA, f 1.0 kHz, Note 3) Symbol Vref Min 1.228 1.215 - Typ 1.240 - 7.2 Max 1.252 1.265 20 Min 1.234 1.228 - TLV431B Typ 1.240 - 7.2 Max 1.246 1.252 20 Unit V
DVref
mV
DV ref DV KA Iref DIref IK(min) IK(off)
- - - - - - -
-0.6 0.15 0.04 55 0.01 0.012 0.25
-1.5 0.3 0.08 80 0.04 0.05 0.4
- - - - - - -
-0.6 0.15 0.04 55 0.01 0.012 0.25
-1.5 0.3 0.08 80 0.04 0.05 0.4
mV V mA mA mA mA
|ZKA|
W
1. Ambient temperature range: Tlow = *40C, Thigh = 85C. 2. The deviation parameters DVref and DIref are defined as the difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. Vref Max DVref = Vref Max - Vref Min Vref Min T1 Ambient Temperature T2 DTA = T2 - T1
The average temperature coefficient of the reference input voltage, aVref is defined as: (DV ) ref V (T + 25C) ref A DT A 106
V ref
ppm + C
aVref can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature, refer to Figure 8. Example: Example: Example: DVref = 7.2 mV and the slope is positive, Vref @ 25C = 1.241 V DTA = 125C Vref 3. The dynamic impedance ZKA is defined as: Z DVKA + KA DI K 0.0072 ppm + 1.241 C 125 10 6 + 46 ppm C
When the device is operating with two external resistors, R1 and R2, (refer to Figure 4) the total dynamic impedance of the circuit is given by: ZKA + ZKA 1 ) R1 R2
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TLV431A, TLV431B
Input IK VKA Input IK R1 Vref Iref VKA Input IK(off) VKA
R2
Vref
V
KA
+V
ref
1 ) R1 ) I S R1 ref R2
Figure 3. Test Circuit for VKA = Vref
Figure 4. Test Circuit for VKA u Vref
Figure 5. Test Circuit for IK(off)
30 I K , CATHODE CURRENT (mA)
110 90
Input IK VKA
20
Input
IK
VKA
I K , CATHODE CURRENT (m A)
70 50 30 10
VKA = Vref TA = 25C
IK(min)
10
VKA = Vref TA = 25C
0
-10 -30 0 0.2 0.4 0.6 0.8 1.0 VKA, CATHODE VOLTAGE (V) 1.2 1.4
-10 -1.0
-0.5
0 0.5 1.0 1.5 VKA, CATHODE VOLTAGE (V)
2.0
Figure 6. Cathode Current vs. Cathode Voltage
Figure 7. Cathode Current vs. Cathode Voltage
1.25 Vref , REFERENCE INPUT VOLTAGE (V)
I ref , REFERENCE INPUT CURRENT (m A)
Vref(max)
0.15
Input IK 10 k Iref VKA
1.24
Vref(typ)
0.14
IK = 10 mA
1.23
Input VKA = Vref IK = 10 mA
VKA IK
Vref(min) TLV431A Typ. 85
0.13
1.22 -40
-15 10 35 60 TA, AMBIENT TEMPERATURE (C)
0.12 -40
-15 10 35 60 TA, AMBIENT TEMPERATURE (C)
85
Figure 8. Reference Input Voltage versus Ambient Temperature
Figure 9. Reference Input Current versus Ambient Temperature
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TLV431A, TLV431B
DVref , REFERENCE INPUT VOLTAGE CHANGE (mV) 0 I K(off) , CATHODE CURRENT (m A) -2.0 -4.0
Input VKA IK Vref
4.0 IK = 10 mA TA = 25C
Input Ioff VKA
3.0
VKA = 16 V Vref = 0 V
2.0
-6.0
R1
-8.0 -10
R2
1.0
TA = 25C
0
4.0 8.0 12 VKA, CATHODE VOLTAGE (V)
16
0
0
4.0
8.0 12 16 VKA, CATHODE VOLTAGE (V)
20
Figure 10. Reference Input Voltage Change versus Cathode Voltage
Figure 11. Off-State Cathode Current versus Cathode Voltage
Ioff , OFF-STATE CATHODE CURRENT (m A)
0.4
Input VKA
10
Output
|Za|, DYNAMIC IMPEDANCE (OHM)
IK 50 - +
0.3
VKA = 16 V Vref = 0 V
Ioff
0.2
1.0
0.1
IK = 0.1 mA to 20 mA TA = 25C 0.1 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) 10 M
0 -40
60 -15 10 35 TA, AMBIENT TEMPERATURE (C)
85
Figure 12. Off-State Cathode Current versus Ambient Temperature
0.24 |Za|, DYNAMIC IMPEDANCE (OHM)
Output
Figure 13. Dynamic Impedance versus Frequency
60 A vol , OPEN LOOP VOLTAGE GAIN (dB) 50 40
8.25 k 15 k 9 mF - + IK 230
IK = 0.1 mA to 20 mA f = 1.0 kHz
Output
0.23
50 -
IK
0.22 0.21 0.20 0.19 -40
+
30 20 10 0 IK = 10 mA TA = 25C
-15 10 35 60 TA, AMBIENT TEMPERATURE (C)
85
100
1.0 k
10 k 100 k f, FREQUENCY (Hz)
1.0 M
Figure 14. Dynamic Impedance versus Ambient Temperature http://onsemi.com
5
Figure 15. Open-Loop Voltage Gain versus Frequency
TLV431A, TLV431B
350
Input Input Iref VKA = Vref IK = 10 mA TA = 25C Pulse Generator f = 100 kHz IK Output
1.8 k W Output
NOISE VOLTAGE (nV/ Hz)
325
1.5 (VOLTS) 1.0 0.5 0 2.0 0
50
Output
TA = 25C
300
Input
275
250
10
100
1.0 k 10 k f, FREQUENCY (Hz)
100 k
0
1.0
2.0
3.0
4.0 5.0 6.0 t, TIME (ms)
7.0
8.0
9.0
10.0
Figure 16. Spectral Noise Density
Figure 17. Pulse Response
25 20 15 B 10 5.0 0 10 pF A
1.0 k TA = 25C Stable V+ C Stable R2 R1 IK CL
I K, CATHODE CURRENT (mA)
Stable D 100 pF 1.0 nF 0.01 mF 0.1 mF 1.0 mF 10 mF 100 mF
Unstable Regions A, C B, D
VKA (V) Vref 5.0
R1 (kW) 0 30.4
R2 (kW) 10
CL, LOAD CAPACITANCE
Figure 18. Stability Boundary Conditions
Figure 19. Test Circuit for Figure 18
Stability Figures 18 and 19 show the stability boundaries and circuit configurations for the worst case conditions with the load capacitance mounted as close as possible to the device. The required load capacitance for stable operation can vary depending on the operating temperature and capacitor
equivalent series resistance (ESR). Ceramic or tantalum surface mount capacitors are recommended for both temperature and ESR. The application circuit stability should be verified over the anticipated operating current and temperature ranges.
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TLV431A, TLV431B
TYPICAL APPLICATIONS
Vin Vin R1 Vout R1 Vout
R2
R2
Vout + 1 ) R1 V R2 ref
Vout + 1 ) R1 V R2 ref
Figure 20. Shunt Regulator
Figure 21. High Current Shunt Regulator
Vin
MC7805 Out In Common R1
Vin Vout R1
Vout
R2 R2
V + 1 ) R1 V out R2 ref Vout(min) + Vref ) 5.0 V
V + 1 ) R1 V out R2 ref V out(min) + Vref ) V be [ 2.0 V
Figure 22. Output Control for a Three Terminal Fixed Regulator
Figure 23. Series Pass Regulator
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TLV431A, TLV431B
Vin Isink I Vin RCL Iout Vout sink V + ref R S
V I out + ref R CL
RS
Figure 24. Constant Current Source
Figure 25. Constant Current Sink
Vin R1
Vout
Vin R1
Vout
R2
R2
V + 1 ) R1 V out(trip) R2 ref
V + 1 ) R1 V out(trip) R2 ref
Figure 26. TRIAC Crowbar
Figure 27. SCR Crowbar
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TLV431A, TLV431B
Vin LED R1 R3 V+
Vout Vin R2 R4
L.E.D. indicator is `ON' when Vin is between the upper and lower limits, Lower limit + 1 ) R1 V R2 ref Upper limit + 1 ) R3 V R4 ref
Vin tVref uVref
Vout V+ 0.74 V
Figure 28. Voltage Monitor
Figure 29. Single-Supply Comparator with Temperature-Compensated Threshold
25 V 1N5305 2.0 mA T1 = 330 W to 8.0 W T1 10 k Calibrate 8.0 W
38 V 330
5k 1%
50 k 1% 10 kW V 1.0 kW V
500 k 1%
1.0 M 1% 100 kW V 1.0 MW V
+ 360 k
470 mF
1.0 mF * 25 V - 0.05 mF Vout -5.0 V * Thermalloy * THM 6024 * Heatsink on * LP Package. 56 k 10 k Tone
Volume 47 k 25 k
Range Rx
+
R x + V out D W Range V
Figure 30. Linear Ohmmeter
Figure 31. Simple 400 mW Phono Amplifier
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9
TLV431A, TLV431B
AC Input DC Output 3.3 V
Gate Drive VCC Controller VFB Current Sense GND
100
R1 3.0 k C1 0.1 mF
R2 1.8 k
Figure 32. Isolated Output Line Powered Switching Power Supply
The above circuit shows the TLV431A/B as a compensated amplifier controlling the feedback loop of an isolated output line powered switching regulator. The output voltage is programmed to 3.3 V by the resistors values selected for R1 and R2. The minimum output voltage that can be programmed with this circuit is 2.64 V, and is limited by the sum of the reference voltage (1.24 V) and the forward drop of the optocoupler light emitting diode (1.4 V). Capacitor C1 provides loop compensation.
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TLV431A, TLV431B
PIN CONNECTIONS AND DEVICE MARKING
TO-92 TLV43 1XXX ALYWW 1. Reference 2. Anode 3. Cathode 1 23 NC NC Cathode TSOP-5
1 2 3 5
SOT-23-3 Anode Reference 1 XXX
3
(Top View) XXX A L Y WW, W = Specific Device Code = Assembly Location = Wafer Lot = Year = Work Week
XXXYW
Anode
4
Reference
Cathode 2 (Top View)
ORDERING INFORMATION
Device TLV431ALP TLV431ALPG TLV431ALPRA TLV431ALPRAG TLV431ALPRE TLV431ALPREG TLV431ALPRM TLV431ALPRP TLV431ALPRPG TLV431ASNT1 TLV431ASNT1G TLV431ASN1T1 TLV431ASN1T1G TLV431BLP TLV431BLPRA TLV431BLPRAG TLV431BLPRE TLV431BLPRM TLV431BLPRP TLV431BSNT1 TLV431BSNT1G TLV431BSN1T1 TLV431BSN1T1G Device Code ALP ALP ALP ALP ALP ALP ALP ALP ALP RAA RAA RAF RAF BLP BLP BLP BLP BLP BLP RAH RAH RAG RAG Package TO-92-3 TO-92-3 (Pb-Free) TO-92-3 TO-92-3 (Pb-Free) TO-92-3 TO-92-3 (Pb-Free) TO-92-3 TO-92-3 TO-92-3 (Pb-Free) TSOP-5 TSOP-5 (Pb-Free) SOT-23-3 SOT-23-3 (Pb-Free) TO-92-3 TO-92-3 TO-92-3 (Pb-Free) TO-92-3 TO-92-3 TO-92-3 TSOP-5 TSOP-5 (Pb-Free) SOT-23-3 SOT-23-3 (Pb-Free) Shipping 6000/Box 6000/Box 2000/Tape & Reel 2000/Tape & Reel 2000/Tape & Reel 2000/Tape & Reel 2000/Ammo Pack 2000/Ammo Pack 2000/Ammo Pack 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 6000/Box 2000/Tape & Reel 2000/Tape & Reel 2000/Tape & Reel 2000/Ammo Pack 2000/Ammo Pack 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 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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TLV431A, TLV431B
PACKAGE DIMENSIONS
TO-92-3 LP SUFFIX CASE 29-11 ISSUE AL
A R P L
SEATING PLANE
B
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. CONTOUR OF PACKAGE BEYOND DIMENSION R IS UNCONTROLLED. 4. LEAD DIMENSION IS UNCONTROLLED IN P AND BEYOND DIMENSION K MINIMUM. INCHES MIN MAX 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.021 0.045 0.055 0.095 0.105 0.015 0.020 0.500 --- 0.250 --- 0.080 0.105 --- 0.100 0.115 --- 0.135 --- MILLIMETERS MIN MAX 4.45 5.20 4.32 5.33 3.18 4.19 0.407 0.533 1.15 1.39 2.42 2.66 0.39 0.50 12.70 --- 6.35 --- 2.04 2.66 --- 2.54 2.93 --- 3.43 ---
K
XX H V
1
D G J C N N SECTION X-X
DIM A B C D G H J K L N P R V
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TLV431A, TLV431B
PACKAGE DIMENSIONS
TSOP-5 SN SUFFIX CASE 483-02 ISSUE C
D
5 1 2 4 3
S
B
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. A AND B DIMENSIONS DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.90 3.10 0.1142 0.1220 B 1.30 1.70 0.0512 0.0669 C 0.90 1.10 0.0354 0.0433 D 0.25 0.50 0.0098 0.0197 G 0.85 1.05 0.0335 0.0413 H 0.013 0.100 0.0005 0.0040 J 0.10 0.26 0.0040 0.0102 K 0.20 0.60 0.0079 0.0236 L 1.25 1.55 0.0493 0.0610 M 0_ 10 _ 0_ 10 _ S 2.50 3.00 0.0985 0.1181
L A
G J
C 0.05 (0.002) H K
M
SOLDERING FOOTPRINT*
0.95 0.037 1.9 0.074
2.4 0.094 1.0 0.039 0.7 0.028
TSOP-5
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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13
TLV431A, TLV431B
PACKAGE DIMENSIONS
SOT-23-3 SN1 SUFFIX CASE 318-09 ISSUE AK
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. 318-01 THRU -07 AND -09 OBSOLETE, NEW STANDARD 318-08. INCHES MIN MAX 0.1102 0.1197 0.0472 0.0551 0.0350 0.0440 0.0150 0.0200 0.0701 0.0807 0.0005 0.0040 0.0034 0.0070 0.0140 0.0285 0.0350 0.0401 0.0830 0.1039 0.0177 0.0236 MILLIMETERS MIN MAX 2.80 3.04 1.20 1.40 0.89 1.11 0.37 0.50 1.78 2.04 0.013 0.100 0.085 0.177 0.35 0.69 0.89 1.02 2.10 2.64 0.45 0.60
A L
3 1 2
BS
V
G C D H K J
DIM A B C D G H J K L S V
SOLDERING FOOTPRINT*
0.95 0.037 0.95 0.037
2.0 0.079 0.9 0.035 0.8 0.031
SCALE 10:1 mm inches
SOT-23-3
*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 are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation 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 customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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TLV431A/D


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