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MAX4080 Evaluation Kit
Component Suppliers
9) Turn on the power supply.
SUPPLIER
IRC, Inc.
PHONE
361-992-7900
WEBSITE
www.irctt.com
10) Turn on the electronic load.
11) Verify that the first DVM reading is approximately
100mV and the second DVM is approximately 6V.
TDK Corp. 847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX4080 or MAX4081
when contacting these component suppliers.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
? One 12V, 1A power supply
? One electronic load capable of sinking 1A
? Two digital voltmeters (DVMs)
Procedure
The MAX4080 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
electronic load until all connections are completed.
1) MAX4081 only: Verify that a shunt is installed across
pins 1-2 of jumper JU1.
2) MAX4081 only: Verify that a shunt is installed across
pins 1-2 of jumper JU2.
3) Set the power supply to 12V and connect the posi-
tive terminal to the VCC pad. Connect the ground of
the power supply to the GND pad closest to the
VCC pad.
4) Connect the VCC pad and the VSENSE+ pad.
5) Set the electronic load to sink 1A.
6) Connect the electronic load’s positive terminal to
the VSENSE- pad. Connect the load’s ground to the
GND pad closest to the VCC pad.
7) Connect a voltmeter across the VSENSE+ and
VSENSE- pads. (Note that this voltmeter measure-
ment will not accurately reflect actual sense voltage
across the sense resistor due to voltage drop in the
trace and in the connectors. Accurate measurement
of sense voltage across low-value sense resistors
requires the use of 4-wire Kelvin-connected sense
resistors. The EV kit board shows one example of
good layout practice by which RS+ and RS- of the
current-sense amplifier can connect to commonly
available 2-wire sense resistors.)
8) Connect the second voltmeter across the VOUT
pad and the closest GND pad.
12) Adjust the electronic load current to between 1A
and 0A and verify that the reading of the second
DVM is about 60 times the reading of the first DVM.
Detailed Description
The MAX4080 EV kit is a current-sense amplifier that
measures the load current and provides an analog volt-
age output. The full-scale V SENSE is set to 100mV. The
full-scale I SENSE is set at 1A. They can be changed by
replacing current-sense resistor R1 to another appropri-
ate value.
Applying the V CC Power Supply and the
Load Power Supply
The EV kit is installed with a MAX4080SAUA, which has
a gain of 60. The current-sense-resistor value is 0.1 Ω .
The V OUT is given by:
V OUT = V SENSE × A V = I SENSE × 0 . 1 × 60
where V SENSE is the sense voltage, I SENSE is the load
current, and A V is the gain of the device.
Note: Output voltage is internally clamped not to
exceed 18V.
Normal operating V CC , V SENSE+ , and V SENSE- range is
4.5V to 76V.
Measuring the Load Current
The load current is measured as a voltage drop
(V SENSE ) across an external sense resistor. This volt-
age is then amplified by the current-sense amplifier and
presented at its OUT pin. Like all differential amplifiers,
the output voltage has two components of error (an off-
set error and a gain error). The offset error affects accu-
racy of measurement at low currents and a gain error
affects output accuracy at large currents—both errors
affect accuracy of measurement at intermediate cur-
rents. By minimizing both offset and gain errors, accu-
rate measurements can be obtained from the
MAX4080/MAX4081 over a wide dynamic range.
2
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