Evaluation Board User Guide
UG-492
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the iCoupler ADuM4470, ADuM4471, ADuM4472, ADuM4473, and
ADuM4474 Isolated Switching Regulators with Integrated Feedback
FEATURES
GENERAL DESCRIPTION
ADuM447x circuits, including 5 kV rms isolated dc-to-dc
converters
Single supply (default)
5 V input to 5 V output (regulated)
Reconfigurable to 5 V input to 3.3 V output or
3.3 V input to 3.3 V output
Double supply
5 V input to 15 V output (regulated) and 7.5 V output
(unregulated)
Reconfigurable to 5 V input to 12 V output (regulated)
and 6 V output (unregulated)
Footprints for Coilcraft, Inc., and Halo Electronics, Inc.,
transformer options
Multiple switching frequency options
The EVAL-ADuM4471EBZ board can be used for different
applications of the ADuM447x iCoupler isolated switching
regulators. With the ability to be configured as a circuit with
either single- (default) or double-supply output, the board supports
a variety of input/output configurations and multiple transformer
options. It is equipped with an ADuM4471 switching regulator
(ADuM4471ARIZ) for voltage isolation, but can also be used
with ADuM4470ARIZ, ADuM4472ARIZ, ADuM4473ARIZ, or
ADuM4474ARIZ. The regulator features integrated feedback and a
switching frequency that can be set from 200 kHz to 1000 kHz.
SUPPORTED iCoupler MODELS
ADuM4470
ADuM4471
ADuM4472
ADuM4473
ADuM4474
This user guide provides all the necessary details to set up
and use the EVAL-ADuM4471EBZ board. Although the
EVAL-ADuM4471EBZ comes with the ADuM4471 switching
regulator on board, the printed circuit board (PCB) is designed
for compatibility with the entire ADuM447x family. Additional
information about the supported iCoupler devices is available in
the ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
data sheet, which should be consulted in conjunction with this
user guide when using the EVAL-ADuM4471EBZ board.
11137-001
EVAL-ADUM4471EBZ BOARD PHOTOGRAPH
Figure 1. Single-Supply and Double-Supply Configurations
See the last page for an important warning and disclaimers.
Rev. 0 | Page 1 of 12
UG-492
Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Other Input and Isolated Output Supply Options ....................6
Supported iCoupler Models ............................................................ 1
Double Supply ....................................................................................7
General Description ......................................................................... 1
Terminals ........................................................................................7
EVAL-ADuM4471EBZ Board Photograph .................................... 1
Transformer Selection ..................................................................7
Revision History ............................................................................... 2
Switching Frequency Options......................................................8
Configuring the Board for Single- or Double-Supply Output ... 3
Other Secondary Isolated Supply Configurations ....................8
Single Supply ..................................................................................... 4
Evaluation Board Schematics and Artwork ................................ 10
Terminals ....................................................................................... 4
Evaluation Board Layout ........................................................... 11
Transformer Selection .................................................................. 5
Bill of Materials ............................................................................... 12
Switching Frequency Options ..................................................... 5
REVISION HISTORY
6/13—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
Evaluation Board User Guide
UG-492
CONFIGURING THE BOARD FOR SINGLE- OR DOUBLE-SUPPLY OUTPUT
The EVAL-ADuM4471EBZ board can be configured for an
isolated circuit with either single- or double-supply output. See
Table 1 for information about the setup of the feedback divider
resistors for the single- and double-supply configurations. For
additional applications information about the supported iCoupler
devices in these configurations, see the ADuM4470/ADuM4471/
ADuM4472/ADuM4473/ADuM4474 data sheet. Figure 12 and
Figure 13 shows the schematics for the EVAL-ADuM4471EBZ
board in single- and double-supply configurations.
The single- or double-supply configuration can be selected by
changing the output mode resistor values as described in Table 2.
Table 1. Feedback Divider Resistors Configuration
After setting the feedback divider and output mode resistors,
refer to the Single Supply or Double Supply section for additional
information about configuring the EVAL-ADuM4471EBZ board.
Configuration
3.3 V Single
5 V Single
12 V Double
15 V Double
R6
17.4 kΩ
17.4 kΩ
90.9 kΩ
90.9 kΩ
R10
0Ω
Open
0Ω
Open
R11
14.3 kΩ
14.3 kΩ
24.9 kΩ
24.9 kΩ
R15
10.5 kΩ
10.5 kΩ
10.5 kΩ
10.5 kΩ
Table 2. Output Mode Resistors Configuration
Configuration
3.3 V/5 V Single
12 V/15 V Double
±15 V Double
Rev. 0 | Page 3 of 12
R5
Open
0Ω
Open
R7
0Ω
Open
0Ω
R8
Open
0Ω
Open
R9
0Ω
Open
0Ω
R19
0Ω
Open
Open
UG-492
Evaluation Board User Guide
SINGLE SUPPLY
The ADuM4471 switching regulator on this evaluation board
can be configured for single-supply output. When the switching
regulator is set to single-supply mode, the feedback divider resistors
should be configured as described in Table 1 and the output
mode resistors should be configured as described in Table 2.
By default, the single-supply configuration provides a 5 V
secondary isolated supply with a 5 V primary input supply,
which can provide up to 2.5 W of regulated, isolated power. The
single supply can be reconfigured as a 3.3 V secondary isolated
supply with a 5 V or 3.3 V primary input supply. See the Other
Input and Isolated Output Supply Options section for more
information.
TERMINALS
In the single-supply configuration, the EVAL-ADuM4471EBZ
board has terminal blocks on Side 1 (the primary/power supply
input side) and Side 2 (the secondary/power supply output side).
An 8.0 mm isolation barrier separates Side 1 from Side 2. Figure 2
shows the location of these terminals.
Table 3 summarizes the functions of the terminal connections.
These connections are described in more detail in the Input
Power Connections and Output Power Connections sections.
Input Power Connections
Connect 5 V to P1, labeled 5V (or connect 3.3 V to P1 for a 3.3 V
primary input supply with a 3.3 V secondary isolated supply).
Connect the negative end of the supply to P2, labeled GND.
These are the only off-board connections required for the board
to function in single-supply configuration.
Connect the 5 V input supplies (VDD1 and VDDA) to the
ADuM4471 (U1) in single-supply configuration. VDD1 is the
ADuM4471 transformer driver supply, and VDDA is the primary
supply voltage (see the ADuM4470/ADuM4471/ADuM4472/
ADuM4473/ADuM4474 data sheet for additional information).
VDD1 and VDDA are bypassed by a 47 µF ceramic capacitor (C3)
and a 0.1 µF local bypass capacitor (C8) located close to the
ADuM4471. R4, R3, C4, and C5 are provided for an optional and
unpopulated snubber, which can be used to reduce radiated
emissions.
Power is transferred to Side 2 by a regulated push-pull converter,
comprising the ADuM4471 (U1), an external transformer (T2
or T3), and other components (see the ADuM4470/ADuM4471/
ADuM4472/ADuM4473/ADuM4474 data sheet for an
explanation of this circuit functionality).
Table 3. Single-Supply Terminal Function Descriptions
Label
5V
GND
OUT1
ISO_GND
Description
Side 1—5 V primary input supply
Side 1—ground reference
Side 2—5 V secondary isolated supply
Side 2—ground reference
11137-002
Terminal
P1
P2
P7
P8
Figure 2. Single-Supply and Double-Supply Board Terminals
Rev. 0 | Page 4 of 12
Evaluation Board User Guide
UG-492
Output Power Connections
Table 4. Single-Supply Terminal Connections
An output load can be connected to P7, labeled OUT1, which is the
isolated, regulated 5 V output supply. Connect the return of the
load to P8, labeled ISO_GND, which is the Side 2 ground reference.
Including the current necessary for the ADuM4471 secondary
side (I/O and pulse-width modulation control), this supply can
provide up to 500 mA in the default configuration—a 5 V primary
input supply with a 5 V secondary isolated supply. The isolated
data channels on Side 2 load the secondary isolated supply and
reduce the total available current. Figure 4 through Figure 7 show
how the efficiency of the power supply varies with load current,
switching frequency, and temperature.
Terminal
J6
Pin
1
Mnemonic
+5V IN
J8
2
3
4
5
6
N/A
I/O1
I/O2
I/O3
I/O4
GND
N/A
J7
1
+5V/3.3V
2
3
4
5
6
I/O1
I/O2
I/O3
I/O4
GND ISO
Care must be taken to avoid driving an output pin with an
external voltage because this can result in permanent damage
to the ADuM4471.
Data I/O Connection
The EVAL-ADuM4471EBZ supports a variety of I/O configurations. The user has access to all four of the ADuM4471 digital
isolation channels via the terminals. With an ADuM4471 populated,
I/O1 through I/O3 are inputs on Side 1 and outputs on Side 2.
I/O4 is an output on Side 1 and an input on Side 2. Table 4
identifies the ADuM4471 pins to which I/Ox are connected.
Populating J6 allows the user to connect the ADuM4471 VIA
input directly to a 50 Ω signal source. R30 must be shorted with
a 0 Ω resistor to connect the SMA to VIA. R27, R28, and R29
allow the user to implement various I/O interconnection
schemes. For example, soldering 0 Ω, 0805 resistors to R27 and
R28 ties VIA, VIB, and VIC together.
Note that R29 must not be populated if an external signal source
is applied to I/O3. This can cause permanent damage to the
ADuM4471 because an output pin is being driven. R29 can be
used to connect VIC to VOD so that VOD drives VIC. C9 through
C11 and C13 should not be populated when an ADuM4471 is
equipped. C12, C14, C15, and C16 are 0603 pads for optional
and unpopulated loads for the data outputs.
The PCB is designed for compatibility with the entire ADuM447x
family. If another ADuM447x replaces the ADuM4471, other
I/O interconnection schemes are possible. See the ADuM4470/
ADuM4471/ADuM4472/ADuM4473/ADuM4474 data sheet
for the pin descriptions of these configurations. These changes
are at the discretion of the user. Care must be taken to avoid
driving an output pin with an external voltage because this can
result in permanent damage to the switching regulator.
ADuM4471 Connection
Description
Side 1—5 V primary input
supply
VIA
Side 1—Logic Input A
VIB
Side 1—Logic Input B
VIC
Side 1—Logic Input C
VOD
Side 1—Logic Output D
GND1 Side 1—ground reference
VIA
Side 1—SMA connector to
J6, I/O1
VDD2
Side 2—5 V secondary
isolated supply
VOA
Side 2—Logic Output A
VOB
Side 2—Logic Output B
VOC
Side 2—Logic Output C
VID
Side 2—Logic Input D
GND2 Side 2—ground reference
Pin
VDDA
TRANSFORMER SELECTION
The EVAL-ADuM4471EBZ board supports multiple transformer
options. In the single-supply configuration, the board is equipped
with a Halo Electronics TGRAD-560V8LF (T2) or a Coilcraft
CR7983-CL (T3) 1CT:2CT turns ratio transformer; the default
is the Coilcraft transformer. The Halo Electronics footprint is in
the middle of the Coilcraft footprint. Figure 4 and Figure 6 show
the efficiency curves when the board operates in single-supply
configuration using a Coilcraft transformer (CR7983-CL) and a
Halo Electronics (TGRAD-560V8LF) transformer, respectively.
SWITCHING FREQUENCY OPTIONS
The resistance connected from the ADuM4471 oscillator control
pin (OC) to ground sets the single-supply switching frequency.
Figure 3 shows the relationship between this resistance and the
converter switching frequency. The EVAL-ADuM4471EBZ can
be configured with 0 Ω, 0603 resistors to set one of four preset
switching frequencies. Table 5 lists the switching frequencies that
can be selected by short- or open-circuiting R12, R13, and R14.
The user can select a different switching frequency by removing
R12 and R13 and then choosing R18 based on Figure 3. The board
is configured for the 500 kHz setting by default. Figure 4 and
Figure 6 show how the switching frequency affects the efficiency
of the supply using a Coilcraft transformer (CR7983-CL) and a
Halo Electronics transformer (TGRAD-560V8LF), respectively.
Figure 5 shows how the efficiency curves vary over temperature
with a 500 kHz switching frequency.
Table 5. Switching Frequency Selection
R12
0Ω
Open
0Ω
0Ω
Rev. 0 | Page 5 of 12
R13
Open
Open
Open
0Ω
R14
Open
0Ω
0Ω
0Ω
ROC
300 kΩ
100 kΩ
75 kΩ
50 kΩ
Switching Frequency (fSW)
200 kHz
500 kHz (default)
700 kHz
1 MHz
UG-492
Evaluation Board User Guide
1500
90
1400
80
1300
1200
70
1100
EFFICIENCY (%)
1000
fSW (kHz)
900
800
700
600
500
60
50
40
30
400
–40°C
+25°C
+105°C
20
300
200
10
0
0
50
100
150
200
250
300
350
400
450
500
0
50
100
ROC (kΩ)
150
200
250
300
350
400
LOAD CURRENT (mA)
11137-003
NOTES
1. ROC IS A CALCULATED VALUE BASED ON THE SELECTION OF
R12, R13, AND R14.
Figure 5. 5 V Input to 5 V Output Efficiency Using a 1CT:2CT Coilcraft Transformer
(CR7983-CL) at 500 kHz and Various Temperatures
90
Figure 3. Switching Frequency (fSW) vs. Oscillator Resistance (ROC)
OTHER INPUT AND ISOLATED OUTPUT SUPPLY
OPTIONS
80
In the single-supply configuration, the board can be set up to
have a 3.3 V secondary isolated supply with a 3.3 V or 5 V primary
input supply. Short-circuiting R10 by soldering a 0 Ω, 0603 resistor
to R9 sets the output supply to 3.3 V. The voltage at the feedback
node (the FB pin of the ADuM4471) should be the desired output
voltage divided to approximately 1.25 V. Having R10 open-circuited
sets the secondary isolated supply to 5 V, and having R10 shortcircuited sets the supply to 3.3 V. See the ADuM4470/ADuM4471/
ADuM4472/ADuM4473/ADuM4474 data sheet for more
information about setting the secondary isolated output supply
voltage. Figure 7 shows how the efficiency curves change in
single-supply configuration when the board is reconfigured by
open- or short-circuiting R10.
EFFICIENCY (%)
70
60
50
40
1MHz
700kHz
500kHz
200kHz
30
20
10
0
0
50
100
150
200
250
300
350
400
LOAD CURRENT (mA)
11137-006
0
11137-005
100
Figure 6. 5 V Input to 5 V Output Efficiency Using a 1CT:2CT Halo Electronics
Transformer (TGRAD-560V8LF) at Various Switching Frequencies
80
90
70
80
60
EFFICIENCY (%)
60
50
40
1MHz
700kHz
500kHz
200kHz
30
50
40
30
5V IN TO 5V OUT
5V IN TO 3.3V OUT
3.3V IN TO 3.3V OUT
20
20
10
10
0
50
100
150
200
250
LOAD CURRENT (mA)
300
350
400
11137-004
0
0
0
50
100
150
200
250
LOAD CURRENT (mA)
Figure 4. 5 V Input to 5 V Output Efficiency Using a 1CT:2CT Coilcraft Transformer
(CR7983-CL) at Various Switching Frequencies
Rev. 0 | Page 6 of 12
300
350
400
11137-007
EFFICIENCY (%)
70
Figure 7. Single-Supply Efficiency for Various Output Configurations
Using a 1CT:2CT Coilcraft Transformer (CR7983-CL) at 500 kHz
Evaluation Board User Guide
UG-492
DOUBLE SUPPLY
The ADuM4471 switching regulator on this evaluation board can
be configured for double-supply output (for more information
about the transformer, see the Transformer Selection section).
When the ADuM4471 is set to double-supply mode, the
feedback divider resistors should be configured as described in
Table 1 and the output mode resistors should be configured as
described in Table 2.
By default, the double-supply configuration provides a regulated
15 V output and an unregulated 7.5 V output, which are isolated
from the 5 V primary input supply. The double supply is capable of delivering up to 140 mA to external loads. The isolated
data channels on Side 2 load the secondary isolated supply and
reduce the total available current. The double supply can be
reconfigured as 12 V (regulated) and 6 V (unregulated) secondary
isolated supplies or as positive and negative supplies. See the
Other Secondary Isolated Supply Configurations section for
more information.
TERMINALS
In the double-supply configuration, the EVAL-ADuM4471EBZ
board has terminal blocks on Side 1 (the primary/power supply
input side) and Side 2 (the secondary/power supply output side).
An 8.0 mm isolation barrier separates Side 1 from Side 2. Table 6
summarizes the functions of the terminal connections. These
connections are described in detail in the Input Power Connections
and Output Power Connections sections.
Table 6. Double-Supply Terminal Function Descriptions
Terminal
P1
P2
P9
Label
5V
GND
OUT2
P10
P7
ISO_GND
OUT1
P8
ISO_GND
Description
Side 1—5 V primary input supply
Side 1—ground reference
Side 2—7.5 V secondary isolated supply
(unregulated)
Side 2—ground reference
Side 2—15 V secondary isolated supply
(regulated)
Side 2—ground reference
Input Power Connections
Connect 5 V to P1 (labeled 5V), and connect the negative end
of the supply to P2 (labeled GND). These are the only off-board
connections required for the board to function in double-supply
configuration.
Connect the 5 V input supplies (VDD1 and VDDA) to the
ADuM4471 (U1) in double-supply configuration. VDD1 is the
ADuM4471 transformer driver supply, and VDDA is the primary
supply voltage (see the ADuM4470/ADuM4471/ADuM4472/
ADuM4473/ADuM4474 data sheet for additional information).
VDD1 and VDDA are bypassed by a 47 µF ceramic capacitor (C3)
and a 0.1 µF local bypass capacitor (C8) located close to the
ADuM4471. R4, R3, C4, and C5 are provided for an optional
and unpopulated snubber, which can be used to reduce radiated
emissions.
Output Power Connections
Output loads can be connected to P9 (labeled OUT2) and P7
(labeled OUT1), which are the isolated, unregulated 7.5 V and
regulated 15 V output supplies, respectively. Connect the return
of the load to P10 and P8, which are labeled ISO_GND.
Side 2 is powered by the secondary isolated 15 V supply. The
ADuM4471 internal low dropout regulator converts this voltage
to 5 V. The regulated 5 V supply powers the ADuM4471 secondary
side. Therefore, the ADuM4471 VREG pin is 15 V, and the VDD2
pin is 5 V. The 15 V supply connects to P7 (labeled OUT1). The
7.5 V supply connects to P9 (labeled OUT2). The Side 2 ground
reference is tied to P10. See the ADuM4470/ADuM4471/
ADuM4472/ADuM4473/ADuM4474 data sheet for an
explanation of the double-supply theory of operation. Figure 8
through Figure 11 show efficiency curves for the double supply
with the 15 V or 12 V isolated output supply connected to VREG.
Powering VREG from the Unregulated 7.5 V Supply
VREG can be powered from the unregulated 7.5 V supply, which
results in higher efficiency. However, when the 15 V supply is
unloaded, the unregulated 7.5 V supply is approximately 3 V,
which is insufficient for powering the ADuM4471 secondary
side. This causes the double supply to run open-loop, leaving
the 15 V supply unregulated. Using 15 V for VREG ensures that
the secondary side of the ADuM4471 powers up under light
load conditions. Move the 0 Ω, 0603 resistor from R8 to R9 to
power Side 2 from the 7.5 V supply.
Care must be taken to avoid driving an output pin because this
can result in permanent damage to the ADuM4471.
TRANSFORMER SELECTION
The EVAL-ADuM4471EBZ supports multiple transformer
options. In the double-supply configuration, the board must be
equipped with a Halo Electronics TGRAD-560V8LF (T2) or a
Coilcraft CR7983-CL (T3) 1CT:3CT turns ratio transformer
(see the ADuM4470/ADuM4471/ADuM4472/ADuM4473/
ADuM4474 data sheet for details on transformer selection with
the ADuM4471). Figure 8 and Figure 10 show the efficiency of
the supply using a 1CT:3CT Coilcraft transformer (CR7983CL) and a 1CT:3CT Halo Electronics transformer (TGRAD560V8LF), respectively, at various switching frequencies. Figure 9
shows how temperature affects efficiency.
Rev. 0 | Page 7 of 12
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Evaluation Board User Guide
SWITCHING FREQUENCY OPTIONS
90
The resistance connected from the ADuM4471 oscillator
control pin (OC) to ground sets the double-supply switching
frequency. Figure 3 shows the relationship between this
resistance and the converter switching frequency. The EVALADuM4471EBZ board can be configured with 0 Ω, 0603 resistors
to set one of four preset switching frequencies. Table 7 lists the
switching frequencies that can be selected by short- or opencircuiting R12, R13, and R14.
80
ROC
300 kΩ
100 kΩ
75 kΩ
50 kΩ
EFFICIENCY (%)
0
EFFICIENCY (%)
1MHz
700kHz
500kHz
200kHz
0
20
30
40
50
60
70
80
90 100 110 120 130 140
Figure 10. 5 V Input to 15 V Output Efficiency Using a 1CT:3CT Halo Electronics
Transformer (TGRAD-560V8LF) at Various Switching Frequencies
80
70
Switching Frequency (fSW)
200 kHz
500 kHz (default)
700 kHz
1 MHz
60
50
40
30
70
20
60
10
50
0
5V IN TO 12V OUT
5V IN TO 15V OUT
0
5
10
15
20
25
30
35
40
45
50
55
60
LOAD CURRENT (mA)
40
1MHz
700kHz
500kHz
200kHz
20
20
30
40
50
60
70
80
90 100 110 120 130 140
LOAD CURRENT (mA)
11137-008
10
Figure 8. 5 V Input to 15 V Output Efficiency Using a 1CT:3CT Coilcraft
Transformer (CR7983-CL) at Various Switching Frequencies
70
60
50
40
30
–40°C
+25°C
+105°C
20
In the double-supply configuration, the EVAL-ADuM4471EBZ
board can be configured to have 12 V regulated and 6 V unregulated secondary isolated supplies by short-circuiting R11 with a
0 Ω resistor for R10. The regulated supply voltage is set by the
fraction of the supply that is fed back to the ADuM4471 via the
voltage divider comprising R6, R11, R15, and R10. The voltage
at the feedback pin (FB) is 1.25 V. With R10 open-circuited, the
ADuM4471 feedback voltage is approximately 1.25 V if VISO
is 15 V. When R10 is short-circuited, the feedback voltage is
approximately 1.25 V if VISO is 12 V (see the ADuM4470/
ADuM4471/ADuM4472/ADuM4473/ADuM4474 data sheet for
more information about setting the secondary isolated output
supply voltage). Figure 11 shows the efficiency curves for both
output settings at 500 kHz using a Coilcraft transformer
(CR7983-CL).
0
25
50
75
100
125
LOAD CURRENT (mA)
150
175
200
11137-009
10
0
70
OTHER SECONDARY ISOLATED SUPPLY
CONFIGURATIONS
10
0
65
Figure 11. Double-Supply Efficiency for Various Output Configurations
Using a 1CT:5CT Coilcraft Transformer (CR7983-CL) at 500 kHz
30
0
10
LOAD CURRENT (mA)
80
EIFFICIENCY (%)
30
11137-011
R14
Open
0Ω
0Ω
0Ω
40
10
EFFICIENCY (%)
R13
Open
Open
Open
0Ω
50
20
Table 7. Switching Frequency Selection
R12
0Ω
Open
0Ω
0Ω
60
11137-010
The user can select a different switching frequency by removing
R12 and R13 and then choosing R18 based on Figure 3. The board
is configured for the 500 kHz setting by default. Figure 8 and
Figure 10 show how the switching frequency affects the efficiency
of the supply using a Coilcraft transformer (CR7983-CL) and a
Halo Electronics transformer (TGRAD-560V8LF), respectively.
70
Figure 9. 5 V Input to 15 V Output Efficiency Using a 1CT:3CT Coilcraft
Transformer (CR7983-CL) at 500 kHz and Various Temperatures
Rev. 0 | Page 8 of 12
Evaluation Board User Guide
UG-492
Positive and Negative Outputs
In the double-supply configuration, the EVAL-ADuM4471EBZ
board can be set up to have a positive and negative ±15 V supply by
changing the transformer to a turns ratio 1CT:5CT transformer
(see the ADuM4470/ADuM4471/ADuM4472/ADuM4473/
ADuM4474 data sheet for more information about these
transformers). Other changes begin with removing the 0 Ω
resistors from R5 and R8 and inserting them into R7 and R9.
Short-circuiting R2 instead of R1 changes the unregulated 7.5 V
supply into a −15 V supply. Short-circuiting R5 instead of R7
connects the transformer center tap to the ground plane instead
of the node where L2 and C2 are connected. Note that the negative
supply is unregulated. The positive and negative supplies can be
set for ±12 V instead of ±15 V by short-circuiting R10.
Although the +15 V output can be regulated, the same problems
with regulation can occur as described in the Powering VREG from
the Unregulated 7.5 V Supply section. In addition, the −15 V
supply can vary over a wide range because it is unregulated and
influenced by the changes that occur on the +15 V output.
Rev. 0 | Page 9 of 12
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Evaluation Board User Guide
EVALUATION BOARD SCHEMATICS AND ARTWORK
P3
OUTPUT_2 OUTPUT_1
P4
R 10Ω
L3 47µH
5V
12 T3
8
VOUT1
L1 DNP
D1
C1
5
6
1
2
47µF
D2
C2
L2 DNP
7
11
1
8
R4
DNP
C4
C5
DNP
DNP
2
3
7
6
4
5
R6
17.4kΩ
R70
R8 DNP
P6
TGRAD-560V8LF
R 90Ω
R10
DNP
U1
P1
DA_1
DB_1
DC_1
DD_1
P2
C7
C8
0.1µF
0.1µF
R2 DNP
D4
R5 DNP
P5
C3
47µF
47µF
L4 47µH
DA_1
DB_1
DC_1
DD_4
1
2
3
4
5
6
7
8
9
10
X1
GND1_1
NC
X2
VIA
VIB
VIC
VID
VDDA
GND1_2
VREG
GND2_1
VDD2
FB
VOA
VOB
VOC
VOD
OC
GND2_2
20
19
18
17
16
15
14
13
12
11
ADuM4471
R11
14.3kΩ
P7
VDD2
C6
0.1µF
DA_2
DB_2
DC_2
DD_2
R19 DPN
P8
DA_2
DB_2
DC_2
DD_2
VOUT2
R12
DNP
R13
DNP
R14
0Ω
R16
300kΩ
R17
150kΩ
R18
100kΩ
R15
10.5k
P9
P10
ISO GND
Figure 12. Evaluation Board Schematic, Page 1
Rev. 0 | Page 10 of 12
11137-012
R3
DNP
T2 CR7983-BL
D3
Evaluation Board User Guide
UG-492
R30
J8
DNP
R31
100Ω
R32
100Ω
SMA
R27
DNP
R28
DNP
R29
DNP
VDD2
5V
J6
J7
1
1
2
DA_1
3
DB_1
4
DC_1
5
DD_1
DA_1
DB_1
DC_1
DD_1
DA_2
DB_2
DC_2
2
DB_2
3
DC_2
4
DD_2
DD_2
6
5
6
C9
C10
C11
C12
C13
C14
C15
C16
DNP
DNP
DNP
DNP
DNP
DNP
DNP
DNP
CON6x1
11137-013
CON6x1
DA_2
Figure 13. Evaluation Board Schematic, Page 2
Figure 14. Top Layer: Ground Fill
11137-015
11137-014
EVALUATION BOARD LAYOUT
Figure 15. Bottom Layer: Ground Fill
Rev. 0 | Page 11 of 12
UG-492
Evaluation Board User Guide
BILL OF MATERIALS
Table 8. EVAL-ADuM4471EBZ Bill of Materials
Qty
1
4
1
1
3
10
3
2
2
6
8
1
1
1
1
1
1
2
5
5
2
1
1
2
Reference Designator
U1 1
D1 to D4
T2 2
T32
C1, C2, C3
C4, C5, C9 to C12, C13 to C16
C6, C7, C8
L1, L2
L3, L4
R1, R7, R9, R11, R14, R19
R2, R3, R4, R5, R8, R10, R12, R13
R6
R16
R17
R18
R15
R11
R31, R32
P1, P3, P5, P7, P9
P2, P4, P6, P8, P10
J6, J7
J8
Description
Isolated switching regulator with integrated feedback
Schottky barrier rectifier, 0.5 A, 40 V, SMD, SOD-123
Transformer, 1CT:2CT turns ratio, SMD (not populated)
Transformer, 1CT:2CT turns ratio, SMD
Capacitor, ceramic, X7R, SMD, 1210, 47 µF, 20%, 10 V
Capacitor, ceramic, SMD, 0603 (not populated)
Capacitor, ceramic, X7R, SMD, 0603, 0.1 µF
Inductor, SMD, 2424, 47 µH, 20%, 0.17 Ω
Inductor, SMD, 1212, 47 µH, 20%, 1.25 Ω
Resistor chip, SMD, 0805, 0 Ω, 1/8 W
Not populated
Resistor chip, SMD, 0805, 14.3 kΩ, 1/8 W, 1%
Resistor chip, SMD, 0805, 300 kΩ, 1/8 W, 1%
Resistor chip, SMD, 0805, 150 kΩ, 1/8 W, 1%
Resistor chip, SMD, 0805, 100 kΩ, 1/8 W, 1%
Resistor chip, SMD, 0805, 10.5 kΩ, 1/8 W, 1%
Resistor chip, SMD, 0805, 17.4 kΩ, 1/8 W, 1%
Resistor chip, SMD 1210, 100 Ω, 1/2 W
Test point, red
Test point, black
CON-PCB terminal, 6 × 1 header, 0.1 inch spacing
CON-PCB, SMA (not populated)
Supplier/Part Number
Analog Devices, Inc./ADuM4471ARIZ
ON Semiconductor/MBR0540
Halo Electronics/TGRAD-560V8LF
Coilcraft/CR7983-CL
Murata/GRM32ER71A476KE15L
N/A
AVX/0603YC104KAT2A
Murata/LQH6PPN470M43
Murata/LQH3NPN470MM0
Panasonic/ECG/ERJ-6GEY0R00V
N/A
Panasonic/ECG/ERJ-6ENF1432V
Yageo/RC0805FR-07300KL
Yageo/RC0805FR-07150KL
Panasonic/ECG/ERJ-6ENF1003V
Panasonic/ECG/ERJ-6ENF1052V
Panasonic/ECG/ERJ-6ENF1742V
Panasonic/ECG/ERJ-14NF50R0V
Components Corp./TP-104 series
Components Corp./TP-104 series
Sullins Connector Solutions
N/A
Alternatively, U1 can be populated with ADuM4470ARIZ, ADuM4472ARIZ, ADuM4473ARIZ, or ADuM4474ARIZ.
The board can be populated with either a Coilcraft transformer or a Halo Electronics transformer. Do not populate both T2 and T3.
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG11137-0-6/13(0)
Rev. 0 | Page 12 of 12
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