TI BQ771802 Overvoltage protection for 2-series to 5-series cell li-ion batteries with internal delay timer Datasheet

bq771800, bq771801
bq771802, bq771803
www.ti.com
SLUSAX1 – DECEMBER 2012
Overvoltage Protection for 2-Series to 5-Series Cell Li-Ion Batteries
with Internal Delay Timer
Check for Samples: bq771800, bq771801, bq771802, bq771803
FEATURES
•
1
•
•
•
•
•
•
2-, 3-, 4-, and 5-Series Cell Overvoltage
Protection
Internal Delay Timer
Fixed OVP Threshold
High-Accuracy Overvoltage Protection:
± 10 mV
Low Power Consumption ICC ≈ 1 µA
(VCELL(ALL) < VPROTECT)
Low Leakage Current Per Cell Input < 100 nA
Small Package Footprint
– 8-pin QFN (3 mm × 4 mm)
APPLICATIONS
•
Protection in Li-Ion Battery Packs in:
– Power Tools
– UPS Battery Backup
– Light Electric Vehicles (eBike, eScooter,
Pedal Assist Bicycles)
DESCRIPTION
The bq7718xy family of products is an overvoltage monitor and protector for Li-Ion battery pack systems. Each
cell is monitored independently for an overvoltage condition.
In the bq7718xy device, an internal delay timer is initiated upon detection of an overvoltage condition on any cell.
Upon expiration of the delay timer, the output is triggered into its active state (either high or low depending on the
configuration). For quicker production-line testing, the bq7718xy device provides a Customer Test Mode with
greatly reduced delay time.
VDD
1
8
OUT
V5
2
7
VSS
V4
3
6
V1
V3
4
5
V2
Figure 1. bq771800 Pinout
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated
bq771800, bq771801
bq771802, bq771803
SLUSAX1 – DECEMBER 2012
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
TA
-40°C to
110°C
(1)
OVP (V)
OV Hysteresis
(V)
Output
Delay
Output Drive
Tape and Reel
(Large)
Tape and Reel
(Small)
bq771800
4.300
0.300
4s
CMOS Active
High
bq771800DPJR
bq771800DPJT
bq771801
4.275
0.050
3s
NCH Active Low,
Open Drain
bq771801DPJR
bq771801DPJT
4.225
0.300
1s
NCH Active Low,
Open Drain
bq771802DPJR
bq771802DPJT
bq771803
4.275
0.050
1s
NCH Active Low,
Open Drain
bq771803DPJR
bq771803DPJT
bq7718xy (1)
3.850–4.650
0–0.300
1s
NCH, Active
Low, Open Drain
bq7718xyDPJR
bq7718xyDPJT
Part Number
bq771802
Package
Package
Designator
8-Pin QFN
DPJ
Future option, contact TI.
THERMAL INFORMATION
bq7718xy
THERMAL METRIC (1)
8 PINS
θJA
Junction-to-ambient thermal resistance
56.6
θJC(top)
Junction-to-case(top) thermal resistance
56.4
θJB
Junction-to-board thermal resistance
30.6
ψJT
Junction-to-top characterization parameter
1.0
ψJB
Junction-to-board characterization parameter
37.8
θJC(bottom)
Junction-to-case(bottom) thermal resistance
11.3
(1)
2
UNITS
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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Product Folder Links: bq771800 bq771801 bq771802 bq771803
bq771800, bq771801
bq771802, bq771803
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SLUSAX1 – DECEMBER 2012
PIN FUNCTIONS
bq7718xy
Pin Name
Type I/O
1
VDD
P
Power supply
Description
2
V5
I
Sense input for positive voltage of the fifth cell from the bottom of the stack
3
V4
I
Sense input for positive voltage of the fourth cell from the bottom of the stack
4
V3
I
Sense input for positive voltage of the third cell from the bottom of the stack
5
V2
I
Sense input for positive voltage of the second cell from the bottom of the stack
6
V1
I
Sense input for positive voltage of the lowest cell in the stack
7
VSS
P
Electrically connected to IC ground and negative terminal of the lowest cell in the stack
8
OUT
O
Output drive for overvoltage fault signal
PIN DETAILS
In the bq7718xy device, each cell is monitored independently. Overvoltage is detected by comparing the actual
cell voltage to a protection voltage reference, VOV. If any cell voltage exceeds the programmed OV value, a timer
circuit is activated. When the timer expires, the OUT terminal goes from inactive to active state.
Cell Voltage (V)
(V5–V4, V4–V3, V3–V2, V2–V1, V1–VSS)
For NCH Open Drain Active Low configurations, the OUT pin pulls down to VSS when active (OV present) and is
high impedance when inactive (no OV).
VOV
VOV –VHYS
tDELAY
OUT (V)
Figure 2. Timing for Overvoltage Sensing
Sense Positive Input for Vx
This is an input to sense each single battery cell voltage. A series resistor and a capacitor across the cell for
each input is required for noise filtering and stable voltage monitoring.
Output Drive, OUT
This terminal serves as the fault signal output, and may be ordered in either active HIGH or LOW options.
Supply Input, VDD
This terminal is the unregulated input power source for the IC. A series resistor is connected to limit the current,
and a capacitor is connected to ground for noise filtering.
Copyright © 2012, Texas Instruments Incorporated
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3
bq771800, bq771801
bq771802, bq771803
SLUSAX1 – DECEMBER 2012
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
RVD
PACK+
C VD
VDD
RIN
V5
CIN
RIN
V4
V3
CIN
RIN
V2
Sensing Circuit
CIN
RIN
REG
INT_EN
VOV
Delay
Timer
OUT
CIN
RIN
V1
OSC
CIN
VSS
PACK –
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted) (1)
PARAMETER
CONDITION
VALUE/UNIT
VDD–VSS
–0.3 to 30 V
V5–VSS or V4–VSS or
V3–VSS or V2–VSS or V1–VSS
–0.3 to 30 V
Supply voltage range
Input voltage range
Output voltage range
OUT–VSS
Continuous total power dissipation, PTOT
–0.3 to 30 V
See package dissipation rating.
Functional temperature
–40 to 110°C
Storage temperature range, TSTG
–65 to 150°C
Lead temperature (soldering, 10 s), TSOLDER
(1)
300°C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating
conditions” is not implied. Exposure to absolute-maximum–rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
MIN
MAX
UNIT
3
25
V
0
5
V
–40
110
°C
Supply voltage, VDD (1)
Input voltage range
V5–V4 or V4–V3 or
V3–V2 or V2–V1 or V1–VSS
Operating ambient temperature range, TA
(1)
4
NOM
See APPLICATION SCHEMATIC.
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bq771800, bq771801
bq771802, bq771803
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SLUSAX1 – DECEMBER 2012
DC CHARACTERISTICS
Typical values stated where TA = 25°C and VDD = 18 V, MIN/MAX values stated where TA = –40°C to 110°C and VDD = 3 V
to 25 V (unless otherwise noted).
SYMBOL
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
Voltage Protection Threshold VCx
VOV
V(PROTECT) Overvoltage Detection
bq771800
4.300
V
bq771801, bq771803
4.275
V
bq771802
4.225
bq771800
VHYS
VOA
VOADRIFT
OV Detection Hysteresis
OV Detection Accuracy
OV Detection Accuracy Across
Temperature
250
300
V
400
mV
bq771801, bq771803
0
50
100
V
bq771802
250
300
400
mV
TA = 25°C
–10
10
mV
TA = –40°C
–40
44
mV
TA = 0°C
–20
20
mV
TA = 60°C
–24
24
mV
TA = 110°C
–54
54
mV
2
µA
0.1
µA
Supply and Leakage Current
ICC
Supply Current
(V5–V4) = (V4–V3) = (V3–V2) = (V2–V1) =
(V1–VSS) = 4.0 V (See Figure 13.)
IIN
Input Current at Vx Pins
(V5–V4) = (V4–V3) = (V3–V2) = (V2–V1) =
(V1–VSS) = 4.0 V (See Figure 13.)
1
–0.1
Output Drive OUT, CMOS Active HIGH Versions Only
(V5–V4), (V4–V3), (V3–V2), (V2–V1), or
(V1–VSS) > VOV, VDD = 18 V, IOH = 100 µA
VOUT1
Output Drive Voltage, Active High
6
If three of four cells are short circuited and
only one cell remains powered and > VOV,
VDD = Vx (cell voltage), IOH = 100 µA
VDD – 0.3
(V5–V4), (V4–V3), (V3–V2), (V2–V1), and
(V1–VSS) < VOV, VDD = 18 V, IOL = 100 µA
measured into pin
IOUTH1
OUT Source Current (during OV)
(V5–V4), (V4–V3), (V3–V2), (V2–V1), or
(V1–VSS) > VOV, VDD = 18 V. OUT = 0 V.
Measured out of OUT pin
IOUTL1
OUT Sink Current (no OV)
(V5–V4), (V4–V3), (V3–V2), (V2–V1), and
(V1–VSS) < VOV, VDD = 18 V, OUT = VDD.
Measured into OUT pin
V
250
0.5
V
400
mV
4.5
mA
14
mA
400
mV
14
mA
100
nA
4.8
s
Output Drive OUT, NCH Open Drain Active LOW Versions Only
VOUT2
(V5–V4), (V4–V3), (V3–V2), (V2–V1), or
Output Drive Voltage, Active Low (V1–VSS) > VOV, VDD = 18 V, IOL = 100 µA
measured into OUT pin
IOUTH2
OUT Sink Current (during OV)
(V5–V4), (V4–V3), (V3–V2), (V2–V1), or
(V1–VSS) > VOV, VDD = 18 V. OUT = VDD.
Measured into OUT pin
IOUTL2
OUT Source Current (no OV)
(V5–V4), (V4–V3), (V3–V2), (V2–V1), and
(V1–VSS) < VOV, VDD = 18 V. OUT = VDD.
Measured out of OUT pin
250
0.5
Delay Timer
bq771800
tDELAY
XCTMDELAY
OV Delay Time
Fault Detection Delay Time
during Customer Test Mode
Copyright © 2012, Texas Instruments Incorporated
3.2
4
bq771801
2.4
3
3.6
s
bq771802, bq771803
0.8
1
1.2
s
Preview option only. Contact TI.
4.4
5.5
6.6
s
See .
15
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ms
5
bq771800, bq771801
bq771802, bq771803
SLUSAX1 – DECEMBER 2012
www.ti.com
TYPICAL CHARACTERISTICS
0.316
4.40
Mean
Min
Max
4.39
4.38
0.315
4.36
VHYS (V)
VOUT (V)
4.37
4.35
4.34
4.33
0.314
0.313
4.32
4.31
4.30
−50
−25
0
25
50
Temperature (°C)
75
100
125
0.312
−50
−25
0
G001
Figure 3. Overvoltage Threshold (OVT) vs.
Temperature
25
50
Temperature (°C)
75
100
125
G002
Figure 4. Hysteresis VHYS vs. Temperature
1.8
1.6
1.5
1.6
1.4
1.4
1.2
ICELL (µA)
IDD (µA)
1.3
1.1
1.0
1.2
1.0
0.9
0.8
0.8
0.7
0.6
−50
−25
0
25
50
Temperature (°C)
75
100
125
0.6
−50
Figure 5. IDD Current Consumption vs.
Temperature at VDD = 16 V
−3.68
8
−3.70
7
25
50
Temperature (°C)
75
100
125
G004
6
−3.74
−3.76
VOUT (V)
IOUT (mA)
0
Figure 6. ICELL vs. Temperature
at VCELL= 9.2 V
−3.72
−3.78
−3.80
−3.82
5
4
3
2
−3.84
1
−3.86
−3.88
−50
−25
0
25
50
Temperature (°C)
75
100
Figure 7. Output Current IOUT vs.
Temperature
6
−25
G003
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125
0
0
5
10
G005
15
VDD (V)
20
25
30
G006
Figure 8. VOUT vs. VDD
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: bq771800 bq771801 bq771802 bq771803
bq771800, bq771801
bq771802, bq771803
www.ti.com
SLUSAX1 – DECEMBER 2012
APPLICATION INFORMATION
CVD
VDD
OUT
V5
VSS
V4
V1
V3
V2
RVD
RIN
Cell5
RIN
Cell4
CIN
CIN
RIN
Cell3
CIN
RIN
Cell2
RIN
Cell1
CIN
CIN
Figure 9. Application Configuration
NOTE
In the case of an Open Drain Active Low configuration, an external pull-up resistor is
required on the OUT terminal.
Changes to the ranges stated in Table 1 will impact the accuracy of the cell
measurements.
Changes to the ranges stated in Table 1 will impact the accuracy of the cell measurements. Figure 9 shows each
external component.
Table 1. Parameters
PARAMETER
EXTERNAL COMPONENT
MIN
NOM
MAX
Voltage monitor filter resistance
RIN
900
1000
1100
UNIT
Ω
Voltage monitor filter capacitance
CIN
0.01
0.1
µF
Supply voltage filter resistance
RVD
100
Supply voltage filter capacitance
CVD
1K
0.1
CD external delay capacitance
0.1
OUT Open drain version pull-up resistance
to PACK+
100
Ω
µF
1
µF
kΩ
NOTE
The device is calibrated using an RIN value = 1 kΩ. Using a value other than this
recommended value changes the accuracy of the cell voltage measurements and VOV
trigger level.
Copyright © 2012, Texas Instruments Incorporated
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SLUSAX1 – DECEMBER 2012
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APPLICATION SCHEMATIC
C VD
C VD
RVD
Cell4
R IN
VDD
OUT
VSS
V5
VSS
V4
V1
V4
V1
V3
V2
V3
V2
VDD
OUT
V5
R VD
C IN
RIN
R IN
Cell3
R IN
Cell2
Cell1
R IN
C IN
Cell3
C IN
Cell2
C IN
Cell1
CIN
RIN
Figure 10. 4-Series Cell Configuration
RIN
CIN
CIN
Figure 11. 3-Series Cell Configuration with Fixed
Delay
C VD
R VD
Cell2
Cell1
R IN
R IN
VDD
OUT
V5
VSS
V4
V1
V5
V2
CIN
CIN
Figure 12. 2-Series Cell Configuration with Internal Fixed Delay
NOTE
In these application examples, an external pull-up resistor is required on the OUT terminal
to configure for an Open Drain Active Low operation.
8
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SLUSAX1 – DECEMBER 2012
CUSTOMER TEST MODE
Customer Test Mode (CTM) helps to reduce test time for checking the overvoltage delay timer parameter once
the circuit is implemented in the battery pack. To enter CTM, VDD should be set to at least 10 V higher than V5
(see Figure 13). The delay timer is greater than 10 ms, but considerably shorter than the timer delay in normal
operation. To exit Customer Test Mode, remove the VDD to V5 voltage differential of 10 V so that the decrease
in this value automatically causes an exit.
CAUTION
Avoid exceeding any Absolute Maximum Voltages on any pins when placing the part
into Customer Test Mode. Also avoid exceeding Absolute Maximum Voltages for the
individual cell voltages (V5–V4), (V4–V3), (V4–V3), (V3–V2), (V2–V1), and (V1–VSS).
Stressing the pins beyond the rated limits may cause permanent damage to the
device.
Figure 13 shows the timing for the Customer Test Mode.
Cell Voltage (V)
(V5–V4, V4–V3, V3–V2, V2–V1, V1–VSS)
10 V
VOV
VOV – VHYS
> 10 ms
OUT (V)
Figure 13. Timing for Customer Test Mode
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SLUSAX1 – DECEMBER 2012
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Figure 14 shows the measurement for current consumption for the product for both VDD and Vx.
VDD
OUT
V5
VSS
I IN
V4
V1
I IN
V3
V2
ICC
I IN
Cell5
Cell4
Cell3
I IN
Cell2
IIN
Cell1
Figure 14. Configuration for IC Current Consumption Test
10
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PACKAGE OPTION ADDENDUM
www.ti.com
11-Jan-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package Qty
Drawing
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Samples
(3)
(Requires Login)
BQ771800DPJR
ACTIVE
WSON
DPJ
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771800DPJT
ACTIVE
WSON
DPJ
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771801DPJR
ACTIVE
WSON
DPJ
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771801DPJT
ACTIVE
WSON
DPJ
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771802DPJR
ACTIVE
WSON
DPJ
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771802DPJT
ACTIVE
WSON
DPJ
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771803DPJR
ACTIVE
WSON
DPJ
8
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
BQ771803DPJT
ACTIVE
WSON
DPJ
8
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
11-Jan-2013
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Jan-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
BQ771800DPJR
WSON
DPJ
8
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
3000
330.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771800DPJT
WSON
DPJ
8
250
180.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771801DPJR
WSON
DPJ
8
3000
330.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771801DPJT
WSON
DPJ
8
250
180.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771802DPJR
WSON
DPJ
8
3000
330.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771802DPJT
WSON
DPJ
8
250
180.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771803DPJR
WSON
DPJ
8
3000
330.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
BQ771803DPJT
WSON
DPJ
8
250
180.0
12.4
3.3
4.3
1.1
8.0
12.0
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
11-Jan-2013
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
BQ771800DPJR
WSON
DPJ
8
3000
367.0
367.0
35.0
BQ771800DPJT
WSON
DPJ
8
250
210.0
185.0
35.0
BQ771801DPJR
WSON
DPJ
8
3000
367.0
367.0
35.0
BQ771801DPJT
WSON
DPJ
8
250
210.0
185.0
35.0
BQ771802DPJR
WSON
DPJ
8
3000
367.0
367.0
35.0
BQ771802DPJT
WSON
DPJ
8
250
210.0
185.0
35.0
BQ771803DPJR
WSON
DPJ
8
3000
367.0
367.0
35.0
BQ771803DPJT
WSON
DPJ
8
250
210.0
185.0
35.0
Pack Materials-Page 2
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