Texas Instruments INA250EVM, Руководство пользователя

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VS
SH+
VIN+ VIN
±
SH
±
REF
OUT
IN+ IN
±
GND
INA250
2.7 V to 36 V
C
BYPASS
LOAD
Supply
(
±
0.1 V to +36 V)
+
±
0.1 F
INA250EVM Hardware
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2 INA250EVM Hardware
The INA250EVM requires a 2.7-V to 36-V power supply connected between the VS and GND screw
terminals or test points.
The INA250 has an integrated shunt of value 2 m Ω between the SH+ and SH– pins. Connect a –0.1-V to
+36-V supply in series with the IN+ and IN– banana plugs or test points to provide a path for current
flowing through the integrated shunt resistor. Use a voltmeter on the OUT screw terminal or test point to
measure the voltage output of the INA250.
C1 and C2 are supply bypass capacitors for the INA250.
R1 is a 0- Ω resistor that ties SH+ to VIN+.
R2 is a 0-
Ω
resistor that ties SH– to VIN–.
Components R1, R2, C3, C4, and C5 can be added or replaced to provide optional filtering of the voltages
out of the SH+ and SH– pins and into the VIN+ and VIN– pins of the INA250.
2.1 Theory of Operation
A block diagram of the INA250 test board hardware is shown in Figure 1 .The INA250 test board contains
a 4-port screw terminal block to connect to the supply (VS), ground (GND), reference (REF) and output
(OUT) pins of the INA250. There are ten test points located on the board to access the IN+, IN–, VIN+,
VIN–, REF, OUT, VS, and GND pins of the device. Minimal support circuitry is included on the PCB and
can be removed or bypassed as needed.
Figure 1. INA250 Test Board Block Diagram
4 INA250EVM User's Guide SBOU153 – May 2015
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