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1
DEMO MANUAL DC2620A-A
Rev.B
DESCRIPTION
LTC7106 A 7-Bit Current DAC with
Digital PMBus Interface
Demonstration circuit 2620A-A uses the LTC®7106, a precision,
bidirectional, 7-Bit current DAC with PMBus interface and can be
used to adjust the output voltage of any conventional VFB
referenced regulator. The LTC7106 can work with the vast majority
of power management controllers, regulators or modules to enable
digital control of the output voltage.
The DC2620A-A requires input voltage range from 2.5V to 5.5V,
which can be powered either by external supply or directly from the
DC1613A dongle. The LTC7106 pro-vides three ranges of IDAC output
current: Nominal Range (–64µA to 63µA), Range High (–256µA to
252µA) and Range Low (–16µA to 15.75µA). Only the nominal range is
optimized with the highest accuracy. It is recommended that users
design the resistor divider using the nominal range of the IDAC
setting.
All registered trademarks and trademarks are the property of
their respective owners.
PERFORMANCE SUMMARY
To explore the power system management features of the parts,
download the GUI software LTpowerPlay® onto your PC and use ADI’s
I2C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay
allows the user to reconfigure the part on-the-fly, view IDAC
current value and fault status.
GUI Download
The software can be downloaded from:
LTpowerPlay
For more details and instructions of LTpowerPlay, please refer
to LTpowerPlay for LTC7106 Quick Start Guide.
Design files for this circuit board are available.
Specifications are at TA = 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VDD IC Bias Voltage 2.5 5.5 V
VIDAC IDAC Operation Voltage 0.4 2.0 V
IDAC Output Current Range Nominal, LSB = 1µA –64 63 µA
Range High, LSB = 4µA –256 252 µA
Range Low, LSB = 0.25µA –16 15.75 µA
ACC IDAC Accuracy Nominal Range –1.5 0.8 %
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com?doc=DC2620A-A.pdfhttps://www.analog.com/LTC7106?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2620A-A.html#eb-documentation?doc=DC2620A-A.pdf
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2
DEMO MANUAL DC2620A-A
Rev. B
QUICK START PROCEDUREDemonstration circuit 2620A-A makes it easy
to use the LTC7106 to adjust any conventional VFB referenced
regulator and evaluate its performances. Refer to Figure 1 for
the system setup and boards connection.
Connecting a PC and a Regulator to DC2620A-A
You can use a PC to reconfigure the power management features of
the LTC7106 such as: program IDAC cur-rent, margin IDAC high/low,
read back IDAC value and check fault status. The DC1613A dongle may
be plugged in regardless of whether VIN is present. Dongle can be
hot plugged.
DC2620A-A can adjust the output voltage of any VFB ref-erenced
regulator. Use a twisted wire pair to connect the IDAC and GND pins
of DC2620A-A to VFB and GND pins of the regulator board.
Figure 1. Demo Setup with PC
Follow the procedure below:
1. Make sure JP3 is in OFF position to disable the LTC7106
before turning on the regulator.
2. Turn on the regulator and check for the output voltage as
expected.
3. Once the proper output voltage is established on the
regulator, put JP3 to the ON position to enable the LTC7106.
4. Open the LTpowerPlay software and adjust the IDAC current
value of the LTC7106 through it. Monitor the regulator’s output
voltage as IDAC is changing. See LTpowerPlay Quick Start session
for details
DC2620A-A F01
Demo Board DC2620A-A
USB to I2C/PMBus Dongle
DC1613A
2.5V to 5.5V Power Supply(OPTIONAL)
USB CABLE
12-PIN
CONNECTOR
VIN
IDAC
GND
VFB Referenced Regulator
VFB
GND
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf
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3
DEMO MANUAL DC2620A-A
Rev.B
QUICK START PROCEDUREFigure 2 shows an application diagram
using the LTC7106 with a typical DC/DC voltage regulator. By
connecting IDAC to the feedback node of the voltage regulator, IDAC
can change the output voltage of the regulator with the
equation:
VOUT = VREF 1+
RFB1RFB2
⎡
⎣⎢⎢⎢
⎤
⎦⎥⎥⎥
– IDAC • RFB1
where VREF is the reference voltage of the voltage regula-tor.
RFB1 and RFB2 are the resistor divider for the voltage regulator.
IDAC is the programmed bidirectional current of the LTC7106.
Figure 2. An Application Diagram Using the LTC7106 with a
Typical DC/DC Voltage Regulator
In order to achieve the best IDAC current accuracy of the
LTC7106, it’s recommended to carefully design the volt-age divider
so that the LTC7106 uses its nominal range. A design tool has been
developed to help customers optimize their design. It’s built into
the toolbox of the LTpowerCAD® software tool and can be downloaded
from:
LTpowerCAD
C11µF
10kR1
10kR2
RFB1
RFB2
C2330µF
L1
R410k
LTC7106
VDD
GND
IDAC
SDA
SCL
ALERT
GPO
ASEL0 ASEL1
VDD2.5V
TO 5.5V
SDA
ALERT
SCL
VDD
VIN
DC/DC
SW
VFB
VOUT
RUN
EN
(0.4V to 2V)
VIN
VREF
10kR3
PMBus INTERFACE
–64μA TO 0μA
0μA TO 63μA
DC2620A-A F02
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpowercad.html?doc=DC2620A-A.pdf
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4
DEMO MANUAL DC2620A-A
Rev. B
Figure 3. LTpowerPlay Main Interface for LTC7106
LTpowerPlay is a powerful Windows-based develop-ment environment
that supports Analog Devices power system management ICs, including
the LTC3880, LTC3883, LTC3882, LTC3815, LTC2974 and LTC2978. The
software supports a variety of different tasks. You can
use LTpowerPlay to evaluate Analog Devices ICs by connecting
to a demo board system. LTpowerPlay utilizes the DC1613A
USB-to-SMBus controller to com-municate with one of many potential
targets, including
LTpowerPlay SOFTWARE GUI the LTC7106’s DC2620A-A demo system, or
a customer board. The software also provides an automatic update
feature to keep the software current with the latest set of device
drivers and documentation. The LTpowerPlay software can be
downloaded from:
LTpowerPlay
To access technical support documents for ADI Digital Power
Products visit Help. View online help on the LTpowerPlay menu.
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdf
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5
DEMO MANUAL DC2620A-A
Rev.B
The following procedure describes how to use LTpowerPlay to
monitor and change the settings of LTC7106.
1. Download and install the LTPowerPlay GUI:
LTpowerPlay
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the DC2620A-A. The
system tree on the left-hand side should look like this:
LTpowerPlay QUICK START PROCEDURE
b. A blue message box shows for a few seconds in the lower
left-hand corner, confirming that the LTC7106 is communicating:
c. In the Toolbar, click the “R” icon (RAM to PC) to read the
RAM from the LTC7106. This reads the configuration from the RAM of
LTC7106 and loads it into the GUI. When first powering on, you
should read IDAC current at zero (high impedance IDAC) due to the
LTC7106’s internal power-on reset circuitry until a valid write
takes place. The IDAC current value can be plotted in real time,
shown in the following screenshot (at zero when first
powering on):
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdf
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6
DEMO MANUAL DC2620A-A
Rev. B
d. If you want to change the IDAC current to 10μA for example,
in the Config tab, type “10” in the MFR_IOUT_COMMAND_LTC7106:
LTpowerPlay QUICK START PROCEDURE
Then, click the “W” icon (PC to RAM) to write these register
values to the LTC7106.
If the write is successful, you will see the following
message:
In the Telemetry Plot, you will see IDAC current value change to
the commanding value:
e. If you want to change the IDAC current to a negative value
(meaning sinking current), you need to change the
MFR_IOUT_MAX_LTC7106 to a negative value first (see data sheet for
more details).
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf
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7
DEMO MANUAL DC2620A-A
Rev.B
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART
NUMBER
Required Circuit Components
1 1 C1 CAP., 1.0μF, X5R, 10V, 10%, 0603 AVX, 0603ZD105KAT2A
2 1 C2 CAP., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A
3 4 R1, R5, R6, R9 RES., 0Ω, 1/10W, 0603 VISHAY,
CRCW06030000Z0EA
4 3 R2, R3, R7 RES., 10k, 1%, 1/10W, 0603 KOA SPEER,
RK73H1JTTD1002F
5 3 R10, R11, R12 RES., 100Ω, 1%, 1/10W, 0603 NIC,
NRC06F1000TRF
6 1 U1 IC, DAC 7-BIT CURRENT DAC ANALOG DEVICES, LTC7106EDDB
Additional Demo Board Circuit Components
1 0 C3 CAP., OPTION, 0603 OPTION
2 0 R4 RES., OPTION, 0603 OPTION
3 0 JP4 CONN., OPTION OPTION
4 0 J2 CONN., OPTION OPTION
Hardware
1 8 E1, E2, E3, E4, E5, E6, E7, E8 TEST POINT, TURRET, 0.094",
MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 1 J1 CONN., HDR, SHROUDED, 2mm × 6mm, 2mm, THT, VERT FCI,
98414-G06-12ULF
3 2 JP1, JP2 CONN., HDR, MALE, 1mm × 4mm, 2mm, THT, STR WURTH
ELEKTRONIK, 62000411121
4 1 JP3 CONN., HDR., MALE, 1mm × 3mm, 2mm, THT, STR SULLINS
CONNECTOR SOLUTIONS, NRPN031PAEN-RC
5 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY,
THT-96-717-10
6 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.250"
KEYSTONE, 8831
7 1 PCB1 PCB, DC2620A ANALOG DEVICES, 600-DC2620A
8 4 XJP1, XJP2, XJP3, XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm
WURTH ELEKTRONIK, 60800213421
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf
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8
DEMO MANUAL DC2620A-A
Rev. B
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https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf
-
9
DEMO MANUAL DC2620A-A
Rev.B
Information furnished by Analog Devices is believed to be
accurate and reliable. However, no responsibility is assumed by
Analog Devices for its use, nor for any infringements of patents or
other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is
granted by implication or otherwise under any patent or patent
rights of Analog Devices.
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf
-
10
DEMO MANUAL DC2620A-A
Rev. B
ANALOG DEVICES, INC. 2017-2020
03/20www.analog.com
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.
https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com?doc=DC2620A-A.pdf
DescriptionQuick Start ProcedureLTpowerPlay Software GUI
LTpowerPlay Quick Start ProcedureParts ListSchematic Diagram