MAX9643 Evaluation Kit
Evaluates: MAX9643
General Description
The MAX9643 evaluation kit (EV kit) is an assembled and
tested PCB used to evaluate the MAX9643 60V, high-
speed, precision, unidirectional current-sense amplifier.
The EV kit features a wide -1.5V to 60V input common-
mode range.
Features
S
-1.5V to 60V Input Common-Mode Range
S
Ability to Test with External Sense Voltage
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Component List
DESIGNATION
C1, C2, C5, C7
QTY
4
DESCRIPTION
1FF
Q10%,
50V X7R ceramic
capacitors (0805)
Murata GRM21BR71H105K
0.1FF
Q10%,
50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
Not installed, ceramic capacitor
(0603)
0.1I
Q1%,
0.5W sense resistor
(2010)
IRC LRC-LRF2010LF-01-R100-F
DESIGNATION
R3, R4, R5
RS+, RS-
QTY
0
2
DESCRIPTION
Not installed, resistors—short
(PC trace) (0603)
Test points
60V, high-speed, precision,
current-sense amplifier
(8 TDFN-EP)
Maxim MAX9643TATA+
PCB: MAX9643 EVALUATION
KIT
C3, C4
2
U1
1
C6
0
—
1
R1
1
Component Suppliers
SUPPLIER
IRC, Inc.
Murata Americas
PHONE
361-992-7900
770-436-1300
www.irctt.com
www.murataamericas.com
WEBSITE
Note:
Indicate that you are using the MAX9643 when contacting these component suppliers.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-5858; Rev 1; 5/15
MAX9643 Evaluation Kit
Evaluates: MAX9643
Quick Start
• MAX9643 EV kit
Recommended Equipment
• 12V, 2A power supply (VBATT)
• 5V power supply (VCC)
• Electronic load capable of sinking 1A
• Digital voltmeter (DVM)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on
power supplies until all connections are completed.
1) Set the input power supply to 12V and connect the
positive terminal to the VBATT PCB pad. Connect the
ground of the power supply to the GND PCB pad.
2) Set the VCC power supply to 5V and connect the
positive terminal to the VCC PCB pad. Connect the
ground of the VCC supply to the GND PCB pad.
3) Set the electronic load to sink 1A.
4) Connect the electronic load’s positive terminal to the
LOAD PCB pad. Connect the load’s ground to the
GND PCB pad.
5) Connect the DVM across the OUT and GND PCB
pads.
6) Turn on the 5V power supply.
7) Turn on the 12V power supply.
8) Adjust the electronic load current (I
LOAD
) between 0
and 1A and verify that V
OUT
is proportional to V
SENSE
,
according to the following equation:
=
V
SENSE
×
A
V
V
OUT
where V
SENSE
= I
LOAD
x R1 and A
V
= 2.5V/V.
The EV kit monitors the load current through a current-
sense resistor by converting the sense voltage to a volt-
age output (V
OUT
). High-side current monitoring does not
interfere with the ground path of the load being measured,
making it useful for a variety of high-reliability systems.
The output voltage is given by the following equations:
V
SENSE
I
LOAD
×
R
SENSE
=
Monitoring the Load Current
Procedure
=
V
SENSE
×
A
V
V
OUT
where I
LOAD
is the current load applied to the device,
R
SENSE
is the current-sense resistor R1, and A
V
is the
device gain.
The device has an internal charge pump to generate a
negative voltage rail to bias both the input stage and out-
put stage of the current-sense amplifier. The EV kit uses
a 1FF flying capacitor (C1), which is placed as close
as possible to the CP1 and CP2 pins of the device to
minimize loop area.
The use of a negative voltage rail for its input stage allows
the input common-mode voltage range to extend 1.5V
below ground. The internal negative rail also allows the
output voltage range to extend down to true ground.
To evaluate the EV kit with the 10V/V gain version,
replace U1 with the MAX9643UATA+ device.
To evaluate the EV kit with an external sense voltage,
cut the trace between the resistor pads (R3 and R4),
and connect the external sense voltage directly to the
RS+ and RS- test points. Take care to minimize the loop
caused when wiring the RS+ and RS- test points to the
external sense voltage to reduce noise pickup.
Resistors R3 and R4, when utilized, allow an input
differential filter or an input common-mode filter to be
designed to study its effects on noise rejection in power
electronic circuits, for example. Pads for an output filter
(R5/C6) are also available on the PCB.
Applications
Evaluating the 10V/V Gain Version
Additional Features
Detailed Description of Hardware
The MAX9643 EV kit evaluates the MAX9643 unidirectional
high-side, current-sense amplifier,
ideal for a wide variety
of high-performance industrial power-supply applications.
The current-sense amplifier provides an analog voltage
output proportional to the load current through the external
sense resistor (R1).
Various test points and test pads are
provided for ease of evaluation.
Maxim Integrated
2
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