MAX4173 [MAXIM]
Real-Time Current Monitoring;
| 型号： | MAX4173 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Real-Time Current Monitoring 监控 |
| 文件： | 总4页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4465; Rev 0; 2/09
MAX4173 Evaluation Kit
Evluates:MAX4173
General Description
Features
The MAX4173 evaluation kit (EV kit) is a fully assembled
and tested surface-mount PCB that contains a
MAX4173TEUT+. The MAX4173 is a high-side, current-
sense amplifier with an input common-mode voltage
range that extends from 0 to 28V. The current-sense
amplifier provides an analog voltage output proportion-
al to the load current flowing through an external sense
resistor.
o Real-Time Current Monitoring
o Wide 0 to 28V Input Common-Mode Range
Independent of Operating Supply Voltage
o
0ꢀ.5 ꢁull-Sꢂale ꢃꢂꢂuraꢂy
o Lead(Pb)-ꢁree and RoHS Compliant
o ꢁully ꢃssembled and Tested
The 20V/V gain version of the MAX4173 (MAX4173TEUT+)
and a 150mΩ sense resistor are installed on the board.
Other gain versions of the MAX4173 can be evaluated
by replacing the MAX4173TEUT+ with a MAX4173FEUT+
(50V/V) or a MAX4173HEUT+ (100V/V) and a user-sup-
plied, external sense resistor. The user can easily
match the full-scale sense voltage to the required out-
put-voltage range.
Ordering Information
PART
TYPE
MAX4173EVKIT+
EV kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.1μF 10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
Not installed, resistors—short
(PC trace) (0603)
R2, R3, R4
0
C1
C2
1
1
RS+, RS-
TP1
2
1
3
2
Binding posts
4.7μF 10%, 50V X7R ceramic
capacitor (1210)
Murata GRM32ER71H475K
Multipurpose test point, orange
Multipurpose test points, black
Multipurpose test points, red
TP2, TP4, TP6
TP3, TP5
Not installed, ceramic capacitors
(1210)
C3, C4, C5
C6
0
0
High-side current-sense amplifier
(6 SOT23)
Maxim MAX4173TEUT+
U1
—
1
1
Not installed, ceramic capacitor
(0603)
PCB: MAX4173 Evaluation Kit+
0.15ꢀ 1%, current-sense resistor
(1206)
R1
1
IRC LR1206LF-R150-F
Component Suppliers
SUPPLIER
PHONE
WEBSITE
IRC, Inc.
Murata Electronics North America, Inc.
361-992-7900
770-436-1300
www.irctt.com
www.murata-northamerica.com
Note: Indicate that you are using the MAX4173 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Produꢂts
1
ꢁor priꢂing, delivery, and ordering information, please ꢂontaꢂt Maxim Direꢂt at 1-888-629-4642,
or visit Maxim’s website at wwwꢀmaxim-iꢂꢀꢂomꢀ
MAX4173 Evaluation Kit
Quick Start
Recommended Equipment
Detailed Description of Hardware
The MAX4173 IC is a current-sense amplifier that mea-
sures the load current and provides an analog voltage
• One 12V, 2A power supply
output. The full-scale V
is set to 150mV. The full-
SENSE
• One electronic load capable of sinking 1A
• Two digital voltmeters (DVMs)
scale I
is set at 1A. They can be changed by
SENSE
replacing current-sense resistor R1 to another appropri-
ate value.
Procedure
The MAX4173 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply or the
eleꢂtroniꢂ load until all ꢂonneꢂtions are ꢂompletedꢀ
Applying the VCC Power Supply and the
Load Power Supply
The MAX4173 EV kit is installed with a MAX4173TEUT+,
which has a gain of 20V/V. The current-sense resistor
value is 0.15Ω. The V
is given by:
OUT
1) Set the power supply to 12V and connect the posi-
tive terminal to test point TP3 (VCC) on the EV kit.
Connect the ground of the power supply to test
point TP4 (GND) on the EV kit.
V
OUT
= V
x A = I
x 0.15 x 20
SENSE
V
SENSE
where V
is the sense voltage, I
V
is the load
SENSE
SENSE
current, and A is the gain of the device.
2) Connect the positive terminal of the 12V power sup-
ply to binding post RS+ on the EV kit.
Normal operating VCC is from 3V to 28V. RS+ and RS-
range is 0 to 28V.
3) Set the electronic load to sink 1A.
A
Measuring the Load Current
The load current is measured as a voltage drop
4) Connect the positive terminal of the electronic load
to binding post RS- on the EV kit.
(V
) across an external sense resistor. This volt-
SENSE
5) Connect the negative terminal of the electronic load
to the ground of the power supply.
age is then amplified by the current-sense amplifier and
presented at its OUT pin.
6) Connect a voltmeter across test point TP5 (RS+)
and test point TP6 (RS-).
The MAX4173 EV kit, which is assembled with the
MAX4173TEUT+, is designed with a full-scale sense
voltage drop of 150mV. For a typical 1A full-scale load
current, this results in the use of a 0.15Ω sense resistor
on the MAX4173 EV kit using the following equation:
7) Connect the second voltmeter across test points
TP1 (OUT) and TP2 (GND).
8) Turn on the power supply.
9) Turn on the electronic load.
V
SENSE_FULL _SCALE
LOAD_FULL_SCALE
R1=
I
10) Verify that the first DVM reading is approximately
150mV and the second DVM is approximately 3V.
For different full-scale sense voltage and full-scale
load-current arrangements, the equation above can be
used to determine the appropriate current-sense-
resistor values. Refer to the Recommended Component
Values section in the MAX4173 IC data sheet for further
guidance.
11) Adjust the electronic load current to between 1A
and 0A and verify that the reading of the second
DVM is approximately 20 times the reading of the
first DVM.
Evaluating the
MAX4173FEUT+/MAX4173HEUT+
The MAX4173 EV kit can also be used to evaluate other
gain versions of the MAX4173 (20V/V, 50V/V, 100V/V =
T, F, H suffix, respectively). Replace U1 with a different
version of the MAX4173 and refer to the Recommended
Component Values section in the MAX4173 IC data
sheet for additional information.
2
_______________________________________________________________________________________
MAX4173 Evaluation Kit
Evluates:MAX4173
Figure 1. MAX4173 EV Kit Schematic
_______________________________________________________________________________________
3
MAX4173 Evaluation Kit
Evluates:MAX4173
Figure 2. MAX4173 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX4173 EV Kit PCB Layout—Component Side
Figure 4. MAX4173 EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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