19-4362; Rev 1; 3/09
MAX5963 Evaluation Kit
The MAX5963 evaluation kit (EV kit) circuit demonstrates
the dual hot-swap, current-limit/circuit-breaker, and
ORing functions of the MAX5963 controller. The
MAX5963 EV kit operates from a 7.5V to 40V DC source.
The MAX5963 controls three separate dual n-channel
MOSFETs to regulate load current from an input power
supply providing up to 2A, and performs low-voltagedrop power-supply ORing for two independent outputs.
The MAX5963 EV kit features several jumpers to evaluate
different configurations of the MAX5963. The output current-limit threshold, current-limit timeout period, circuitbreaker threshold and timeout period, ORing threshold,
and fault-management features are programmable.
Shutdown mode is controlled with on-board jumpers or
user-supplied external logic signals. FAULT output signals
are also provided for fault-condition monitoring. The EV kit
circuit is configurable for evaluating the MAX5963 latchoff
or autoretry function and late Vg protection feature.
Features
o Safely Hot Swaps 7.5V to 40V Power Supplies
o Low-Voltage-Drop Power-Supply ORing
o Demonstrates Active-Current-Limit and CircuitBreaker Features
o Programmable Current-Limit and Circuit-Breaker
Timers
o Programmable Output-Load Current Limit
o Demonstrates Fast Current-Limit Response Time
o Evaluates Late Vg Protection Feature
o Demonstrates Latchoff and Autoretry Fault
Management
o Overcurrent FAULT Output Status LED Indicators
o Surface-Mount Construction
o Lead(Pb)-Free and RoHS Compliant
o Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX5963EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
C1, C12, C13
0
Not installed, ceramic capacitors
(2220)
GND (x3), PWR,
OUTA, OUTB
6
Uninsulated banana jacks
1
11-pin header
1
1μF ±10%, 50V X7R ceramic capacitor
(1206)
Murata GRM31MR71H105KA
J1
C2
JU1–JU4, JU7,
JU8
6
3-pin headers
C3
1
220pF ±5%, 50V C0G ceramic
capacitor (0805)
Murata GRM2165C1H221J
JU5, JU6, JU9
3
2-pin headers
C4, C5, C7,
C9, C10, C11
Not installed, ceramic capacitors
(0805)
N1–N3
3
0
40V, 10.3A dual n-channel MOSFETs
(PowerPAK SO8)
Vishay Si7958DP-T1-E3
R1
1
13.7kΩ ±1% resistor (0805)
1
0.1μF ±10%, 50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H104K
R2
1
10kΩ ±1% resistor (0805)
R3, R5
2
100kΩ ±1% resistors (0805)
1μF ±10%, 50V X7R ceramic capacitor
(0805)
Murata GRM21BR71H105K
R4
1
18.2kΩ ±1% resistor (0805)
R6
1
18.2kΩ ±1% resistor (0805)
R7
1
130kΩ ±1% resistor (0805)
R8
1
16.5kΩ ±1% resistor (0805)
R9–R12
4
4.7kΩ ±5% resistors (1812)
Panasonic ERJ12YJ472U
C6
C8
1
C14, C15, C16
0
Not installed, ceramic capacitors
(0603)
D1, D2
2
Yellow surface-mount LEDs (1206)
GND (x4)
4
PC test points, black
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
Evaluates: MAX5963
General Description
Evaluates: MAX5963
MAX5963 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
R13–R16, R22,
R23
0
Not installed, resistors (0805)
R17, R21
2
0.02Ω ±1%, 0.5W sense resistors
(1206)
IRC LRC-LRF1206LF-01-R020-F
DESIGNATION QTY
DESCRIPTION
U1
1
Dual hot-swap and diode ORing
controller (40 TQFN-EP*)
Maxim MAX5963UTL+
—
4
Rubber bumpers
3M SJ-5003
R18
1
221Ω ±1% resistor (0805)
—
9
Shunts (JU1–JU9)
R19
1
1kΩ ±1% resistor (0805)
—
1
PCB: MAX5963 Evaluation Kit+
R20
1
100Ω ±1% resistor (0805)
TP1–TP9
9
PC mini test points, red
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
IRC, Inc.
361-992-7900
www.irctt.com
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Panasonic Corp.
800-344-2112
www.panasonic.com
Vishay
402-563-6866
www.vishay.com
Note: Indicate that you are using the MAX5963 when contacting these component suppliers.
Quick Start
Required Equipment
•
One 8V to 40V DC power supply capable of supplying up to 3A
•
Two voltmeters
6) Set the power supply to 18V and then disable the
output.
7)
Connect the positive terminal of the power supply
to the PWR banana jack. Connect the ground terminal of this power supply to the GND banana jack.
8)
Connect a voltmeter or an oscilloscope to the header
J1-9 FAULTA pin to capture fault signals and the
ground lead to the J1-11 GND pin.
9)
Turn on the power supply and enable the output.
Procedure
The MAX5963 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for board
operation. Caution: Do not turn on the power supply
until all connections are completed.
1) Verify that shunts are installed across pins 1-2 of
jumpers JU1, JU2, JU3 (MAX5963 enabled), and
JU4 (PWR for ON_).
2)
Verify that shunts are installed on jumpers JU5 and
JU6 (ONA and ONB UVLO enabled).
3)
Verify that a shunt is not installed on jumper JU9
(latchoff mode).
4)
Verify that shunts are installed across pins 2-3 of
jumpers JU7 (26ms circuit-breaker timeout) and
JU8 (3.3ms current-limit timeout).
5)
Connect a voltmeter across the OUTA and GND
banana jacks.
2
10) Verify that the voltmeter connected to the OUTA
output measures 18V.
11) Verify that FAULTA measures approximately 17.3V.
12) The EV kit is ready for further testing.
Detailed Description of Hardware
The MAX5963 evaluation kit (EV kit) circuit demonstrates the ORing and independent dual hot-swap, current-limit/circuit-breaker functions of the MAX5963 controller in a 40-pin TQFN package with an exposed pad.
The MAX5963 controls three separate dual n-channel
MOSFETs to implement hot-swapping, ORing and current regulation between the input power source and two
independent output loads on channels A and B. The
MAX5963 implements the low-drop ORing function
_______________________________________________________________________________________
MAX5963 Evaluation Kit
Input Source
The MAX5963 EV kit operates from a 7.5V to 40V input
source connected across the PWR and GND terminals.
The input source must deliver up to 2A of current to the
EV kit. The MAX5963 EV kit controller starts to function
when the PWR voltage exceeds the MAX5963 UVLO
voltage threshold of 6.5V (typ), ON_ UVLO threshold,
and all the positive combinations of the ENX, ENY, and
ENZ pin signals are positive logic (Table 1).
Current-Limit and Threshold Configuration
The MAX5963 limits load current by monitoring voltage
across channel A’s current-sense resistor R17 and R21
for channel B. The respective channel’s MAX5963
GATE_A or GATE_B pin voltage is controlled so the
respective output load current does not exceed the
programmed current-limit threshold (ILIM). The currentlimit threshold is programmed by resistor/capacitor network R19/C15 for both channels. When the load current
is < ILIM, the respective dual MOSFET N2 or N3 is fully
enhanced. When the load current exceeds ILIM, the
respective MOSFET’s gate voltage is reduced to regulate the current, causing the MOSFET to act as a current source. If the load current demand exceeds ILIM
for longer than the current-limit timeout period, the
respective dual MOSFET (N2 or N3) is turned off to disconnect the load. The channel’s FAULT_ signal is also
asserted low at the header J1-9 pin for channel A or J110 pin for channel B.
The output current limit is determined by the value of
sense resistor R17 or R21 and the programmed current-limit voltage threshold across the sense resistor.
The output current limit can be reconfigured by replacing current-sense resistors R17 or R21. Choose sense
resistors that are rated for the new power dissipation
levels and verify that the power ratings for MOSFETs
N1, N2, and N3 meet the new operating conditions.
The current-limit threshold is programmed by resistor/
capacitor network R19/C15 for both channels. To
reconfigure the EV kit for a different current-limit threshold, refer to the Current-Limit Threshold section in the
MAX5963 IC data sheet for more information on selecting a new value for the R19/C15 network.
Circuit-Breaker Configuration
The MAX5963 circuit breaker monitors current across
current-sense resistors R17 (channel A) and R21 (channel B). Once the output exceeds the circuit-breaker
limit, the circuit-breaker timer begins. When the circuitbreaker timers time out, the respective channel’s
GATE_A or GATE_B pin voltage is pulled low, turning
_______________________________________________________________________________________
3
Evaluates: MAX5963
used for power-supply redundancy and fault isolation in
highly reliable power systems. The MAX5963 EV kit is
designed to operate in 7.5V to 40V systems and up to
1A per channel.
During a startup cycle, the two dual n-channel MOSFETs
(N2, N3) are off until the PS voltage exceeds the internal
6.5V (typ) and the programmed 1.24V (typ) ON_ undervoltage lockout thresholds. There are two ways for the
MAX5963 channels to turn on, one is if PWR is higher
than the UVLO and ON_ is higher than 1.25V. When the
system power (GATEPS) MOSFET N1-A is on, the body
diode of GATEOR (MOSFET N1-B) conducts and brings
up PS. GATEPS turns on when PWR is > 6.5V (typ) and
the combination logic of the ENX, EXY, and ENZ pin signals are positive. The other way for the channels to turn
on is if power is applied to the channel itself (either A or
B). Then PS will power up through the body diodes of
N2A/N2B or N3A/N3B. Once PS exceeds the PS UVLO,
and ON_ is higher than 1.25V, both channels will turn on.
In this power mode, current flows from one channel to
the other channel. Once the total current in channel A
and channel B exceed a threshold, GATEOR is turned
on to short out its body diode and minimize its power dissipation. Channel A’s current is sensed by resistor R17
and channel B by resistor R21.
The controller continually monitors the output current of
both channels. If the output current is not lowered to
below the programmed threshold, the controller lowers
the respective channel’s gate-drive voltage of MOSFET
N2 or N3 to regulate the output current at the limit. If the
output current is not lowered below the programmed
threshold within the timeout period, the controller turns
off MOSFETs N2 and N3 and asserts a logic-low on the
respective FAULT_ header J1-9 or J1-10 pin to signal
an overcurrent fault condition. Both channels operate
independent and identical.
The MAX5963 current-limit timeout period is programmed by resistor R8, and the circuit-breaker timeout
period is programmed by resistor R7. Output currentlimit, circuit-breaker, and ORing voltage thresholds are
programmed by resistor/capacitor networks R19/C15,
R18/C14, and R20/C16, respectively, for both channels.
The fault-management function can also be programmed
to autoretry or latchoff mode by configuring jumper JU9.
The ONA and ONB undervoltage lockout thresholds are
reconfigured by jumpers or changing resistors on the EV
kit. Shutdown mode is controlled by on-board jumpers or
with an external logic signal connected to header J1,
ENX, ENY, and ENZ, and GND pins. Various other signals are also available at header J1.
Evaluates: MAX5963
MAX5963 Evaluation Kit
off the respective dual MOSFET (N2 or N3). The circuitbreaker limit is determined by the value of sense resistor R17 or R21 and the programmed circuit-breaker
voltage threshold across the sense resistor. The circuitbreaker voltage threshold is programmed by
resistor/capacitor network R18/C14 for both channels.
The circuit-breaker limit can be reconfigured by replacing current-sense resistors R17 or R21, however, note
that this will also change the current limit. Choose current-sense resistors that are rated for the new powerdissipation levels. Additionally, verify that the power ratings for MOSFETs N1, N2, and N3 meet the new operating conditions.
To reconfigure the EV kit for a different circuit-breaker
threshold, refer to the Circuit-Breaker Threshold section
in the MAX5963 IC data sheet for more information on
selecting a new value for the R18/C14 resistor/capacitor network.
Power-Supply Control and
ORing Configuration
The MAX5963 provides a low-voltage-drop ORing function fault isolation and the EV kit is designed to operate
in 7.5V to 40V systems while providing up to 1A per
channel. During a startup cycle, the two dual n-channel
MOSFETs (N2, N3) are off until the PS voltage exceeds
the internal 6.5V (typ) and the programmed 1.24V (typ)
ON_ undervoltage lockout thresholds. There are two
ways for the MAX5963 channels to turn on, one is if
PWR is higher than the UVLO and ON_ is higher than
1.25V. When the system power (GATEPS) MOSFET N1-A
is on, the body diode of GATEOR (MOSFET N1-B) conducts and brings up PS. GATEPS turns on when PWR is
> 6.5V (typ) and the combination logic of the ENX, ENY,
and ENZ pin signals are positive.
The other way for the channels to turn on is if power is
applied to the channel itself (either A or B). Then PS will
power up through the body diodes of N2A/N2B or
N3A/N3B. Once PS exceeds the PS UVLO and ON_ is
higher than 1.25V, both channels will turn on. In this
power mode, current flows from one channel to the
other. Once the total current in channel A and channel
B exceeds a threshold, GATEOR is turned on to short
out its body diode and minimize its power dissipation.
Channel A’s current is sensed by resistor R17 and
channel B’s current is sensed by resistor R21.
The controller continues to monitor the average voltage
across sense resistors R17 and R21 and turns off
GATEOR when that voltage drops below the V OR
threshold. When GATEOR is turned off, current cannot
backdrive the input source PWR if the voltage at OUT is
higher than the PWR voltage.
4
The VOR threshold is programmed by resistor R20 and
capacitor C16. The VOR threshold is reprogrammed by
replacing resistor R20 with a new value. Refer to the
Power-Supply ORing (GATEPS and GATEOR) section
in the MAX5963 IC data sheet.
Jumper Selection
The MAX5963 EV kit features several jumpers to reconfigure the enable/disable, UVLO, current-limit timer, and
other fault-management functions.
Shutdown, Standby, and Enabled Modes
The MAX5963 EV kit features three jumpers to reconfigure the enable/disable MAX5963 inputs and the poweron/power-off control. The MAX5963 can be configured
for three modes of operation, shutdown, standby, and
enabled. The ENZ provides the power-on/power-off
control. The MAX5963 logically combines the ENX,
ENY, ENZ signals (e.g., [(ENX or ENY) and ENZ]) to
control GATEPS, the system power MOSFET, N1A. Onboard jumpers JU1, JU2, and JU3 control the EV kit’s
mode of operation; an external controller can also be
used. See Table 1 to reconfigure jumpers JU1, JU2,
and JU3 for the desired mode of operation.
Alternatively, the EV kit can be controlled by an external
logic signal connected to header J1 using the ENX,
ENY, and ENZ, and GND header pins. Remove the
shunts from jumpers JU1, JU2, and JU3 and use an
external controller with a logic signal that provides a
logic-low (≤ 0.7V) or logic-high (≥ 1.8V) signal to set the
mode of operation for the EV kit. Refer to the PowerSupply Enables (ENX, ENY, and ENZ) section in the
MAX5963 IC data sheet for more information on using
the MAX5963 ENX, ENY, and ENZ functions.
ONA and ONB Undervoltage Lockout
Thresholds and Disable
The MAX5963 EV kit features three jumpers to configure
the UVLO for channels A and B. The UVLO threshold
(6.5V default) must be exceeded for normal operation. If
the voltage at the ON_ input drops below the 1.24V
threshold, the MAX5963 controller turns off the respective MOSFET’s N2 or N3 to disconnect the input power
supply from the respective output. The controller returns
to normal operation if the input voltage exceeds the
default UVLO threshold. The ONA and ONB signals are
available at header J1 using the ONA, ONB, and GND
header pins. See Table 2 for reconfiguring the channel
A and B UVLO using jumpers JU4, JU5, and JU6.
The MAX5963 EV kit ONA and ONB UVLO threshold is
1.24V and the turn-on voltage is programmable with
resistors. The turn-on voltage can be reconfigured to a
value > 7.5V by changing resistor R4 (ONA) for channel
_______________________________________________________________________________________
MAX5963 Evaluation Kit
Evaluates: MAX5963
Table 1. Shutdown, Standby and Enabled Configuration (JU1, JU2, JU3)
JU1 (ENX)
JU2 (ENY)
JU3 (ENZ)
OUTA
AND/OR
OUTB
1-2
1-2 or 2-3
1-2
Load
Enabled
Power flows from PWR to channels
1-2 or 2-3
1-2
1-2
Load
Enabled
Power flows from PWR to channels
SHUNT POSITION
GATEPS
MOSFET
N1-A
MAX5963 MODE OF OPERATION
2-3
2-3
1-2 or 2-3
Load
Disabled
Shutdown
1-2 or 2-3
1-2 or 2-3
2-3
Load
Disabled
Shutdown
PS receives power from ports
1-2
1-2 or 2-3
1-2
Powered
Enabled
1-2 or 2-3
1-2
1-2
Powered
Enabled
PS receives power from ports
2-3
2-3
1-2 or 2-3
Powered
Disabled
Standby (PS receives power from ports)
Disabled
Standby (PS receives power from ports)
1-2 or 2-3
1-2 or 2-3
2-3
Powered
Not installed
Not installed
Not installed
—
Operation controlled by connections at header J1
Table 2. UVLO Configuration (JU4, JU5, JU6)
SHUNT POSITION
EV KIT UVLO MODE
JU4 (SOURCE)
JU5 (ONA)
JU6 (ONB)
1-2 (PWR) or 2-3 (PS)
Installed
Installed
1-2 (PWR) or 2-3 (PS)
Installed
Not installed
1-2 (PWR) or 2-3 (PS)
Not installed
Installed
1-2 (PWR) or 2-3 (PS)
Not installed
Not installed
Both channels disabled
Not installed
Not installed
Not installed
Disabled
Channels A and B UVLO enabled
Only channel A UVLO enabled
Only channel B UVLO enabled
A, or resistor R6 (ONB) for channel B. Use the following
equation to select the new value:
R4, R6 =
Rtop
⎛ VTURN - ON ⎞
⎜⎜
−1⎟⎟
⎝ 1.24V
⎠
where VTURN-ON is the desired turn-on voltage, Rtop is
resistor R3 or R5 and is typically 100kΩ.
Refer to the Undervoltage Lockout section in the
MAX5963 IC data sheet for more information on using
the MAX5963 ONA and ONB pins.
Circuit-Breaker Timer
The MAX5963 controller features a programmable circuit-breaker timeout function. If either channel’s output
current exceeds the circuit-breaker limit, the circuitbreaker timer begins timing. If the timer exceeds the
programmed timeout period, the MAX5963 disconnects
the input power supply from the load by turning off the
respective channel’s MOSFET, N2 for channel A or N3
for channel B. The timeout period is programmed by
resistor R7 and jumper JU7. The MAX5963 EV kit timeout period can be programmed by configuring jumper
JU7. See Table 3 to reconfigure jumper JU7.
Table 3. Circuit-Breaker Timer
Configuration (JU7)
SHUNT
POSITION
TCB PIN
CONNECTION
CIRCUIT-BREAKER
TIMEOUT PERIOD (ms)
2-3
Connected to R7
26
1-2
Connected to BP
3
The circuit-breaker timeout period can also be configured for a different timeout interval by replacing resistor
R7. Refer to Figure 3 in the MAX5963 IC data sheet to
select a new resistance value for R7.
Refer to the Circuit-Breaker Timeout section in the
MAX5963 IC data sheet for more information. Note:
When reconfiguring the circuit-breaker timer or operating in autoretry mode, may produce excessive
heating and electrical stresses in resistors R17, R21,
_______________________________________________________________________________________
5
Evaluates: MAX5963
MAX5963 Evaluation Kit
MOSFETs N1, N2, N3, and other components in the
power path. Verify that the components on the board
can handle the electrical and thermal stresses with
the new timeout period.
Current-Limit Timer
The MAX5963 controller features a programmable current-limit timeout function. If the current-limit fault
exceeds the programmed timeout period, the MAX5963
disconnects the input power supply from the load by
turning off the respective channel’s MOSFET, N2 for
channel A or N3 for channel B. The timeout period is programmed by resistor R8 and jumper JU8. The MAX5963
EV kit timeout period can be programmed by configuring
jumper JU8. See Table 4 to reconfigure jumper JU8 and
program the current-limit timeout period.
Table 4. Current-Limit Timer
Configuration (JU8)
SHUNT
POSITION
TCL PIN
CONNECTION
CURRENT-LIMIT
TIMEOUT PERIOD (ms)
2-3
Connected to R8
3.3
1-2
Connected to BP
1
The current-limit timeout period can be configured for a
different timeout interval by replacing resistor R8. Refer
to Figure 3 in the MAX5963 IC data sheet to select a
new resistance value for R8.
Refer to the Current-Limit Timeout section in the
MAX5963 IC data sheet for more information. Note:
When operating in autoretry mode, may produce
excessive heating and electrical stresses in resistors
R17, R21, MOSFETs N1, N2, N3, and other components in the power path. Verify that the components
on the board can handle the electrical and thermal
stresses with the new timeout period.
6
FAULTA, FAULTB, and Autoretry/
Latchoff Modes
The MAX5963 EV kit FAULTA and FAULTB outputs are
asserted low to GND when a current-limit fault condition
has occurred. The respective channel’s FAULT_ output
is pulled up to PS by LED biasing resistor pairs, R9/R10
or R11/R12 during normal operating conditions. During
a fault, the MAX5963 turns off the respective MOSFET
(N2 or N3) and asserts a logic-low signal on the
respective FAULT_ output header pin, J1-9 pin for
FAULTA and J1-10 for FAULTB.
The MAX5963 fault mode can be programmed for
latchoff or autoretry mode. In latchoff fault mode, the
MAX5963 turns off dual MOSFET N2 or N3 where the
fault occurred. The MAX5963 EV kit circuit can be reset
to normal operation by removing the fault condition and
cycling the respective channel’s ON_ pin low and then
high. Cycling the ON_ pin can be achieved by applying
a low-to-high transition at the ON_ header pin with a
microcontroller. The MAX5963 will not enter a startup
cycle until its timer tOFF (tOFF = 128 x tTCL) or (128 x
tTCL) has expired. The latchoff fault can also be reset
by turning the input power supply off and on. This
method allows the circuit to restart without a timer wait
period of tOFF.
In autoretry mode, after a fault condition has occurred,
the MAX5963 controller automatically attempts to
restart after the tOFF period of (128 x tTCB) or (128 x
tTCL). All FAULT_ outputs deassert every restart cycle.
The autoretry and latchoff modes are set by configuring
jumper JU9. See Table 5 to reconfigure jumper JU9 for
the desired mode of operation.
Table 5. Autoretry/Latchoff Configuration
(JU9)
SHUNT
POSITION
RETRY PIN
CONNECTION
EV KIT FAULT MODE
Installed
Connected to BP
Autoretry
Not Installed
Not Connected
Latchoff
_______________________________________________________________________________________
MAX5963 Evaluation Kit
Evaluates: MAX5963
Figure 1. MAX5963 EV Kit Schematic
_______________________________________________________________________________________
7
Evaluates: MAX5963
MAX5963 Evaluation Kit
Figure 2. MAX5963 EV Kit Component Placement Guide—Component Side
8
_______________________________________________________________________________________
MAX5963 Evaluation Kit
Evaluates: MAX5963
Figure 3. MAX5963 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
9
Evaluates: MAX5963
MAX5963 Evaluation Kit
Figure 4. MAX5963 EV Kit PCB Layout—Solder Side
10
______________________________________________________________________________________
MAX5963 Evaluation Kit
Evaluates: MAX5963
Figure 5. MAX5963 EV Kit Component Placement Guide—Solder Side
______________________________________________________________________________________
11
Evaluates: MAX5963
MAX5963 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
0
11/08
Initial release
1
3/09
Changed maximum current specification from 5A per channel to 1A.
DESCRIPTION
PAGES
CHANGED
—
1–4
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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