INA270_07 BURR-BROWN [Burr-Brown Corporation], INA270_07 Datasheet - Page 8

• Manufacturer Part Number: INA270_07
• Description: Voltage Output, Unidirectional Measurement Current-Shunt Monitor
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

INA270
INA271
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
8
BASIC CONNECTION
Figure 15
and INA271. The input pins, IN+ and IN–, should be
connected as closely as possible to the shunt
resistor to minimize any resistance in series with the
shunt resistance.
Power-supply bypass capacitors are required for
stability. Applications with noisy or high-impedance
power supplies may require additional decoupling
capacitors to reject power-supply noise. Minimum
bypass capacitors of 0.01 F and 0.1 F in value
should be placed close to the supply pins. Although
not mandatory, an additional 10mF electrolytic
capacitor placed in parallel with the other bypass
capacitors may be useful in applications with
particularly noisy supplies.
shows the basic connection of the INA270
-16V to +80V
Supply
IN+
INA270
5kW
R
A2
A1
S
Figure 15. INA270 Basic Connections
APPLICATIONS INFORMATION
IN-
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5kW
Single-Pole Filter
R
L
PRE OUT
Capacitor
Load
96kW
BUF IN
POWER SUPPLY
The input circuitry of the INA270 and INA271 can
accurately measure beyond its power-supply voltage,
V+. For example, the V+ power supply can be 5V,
whereas the load power-supply voltage is up to
+80V. The output voltage range of the OUT terminal,
however, is limited
power-supply pin.
SELECTING R
The value chosen for the shunt resistor, R
on the application and is a compromise between
small-signal accuracy and maximum permissible
voltage loss in the measurement line. High values of
R
minimizing the effects of offset, while low values of
R
applications, best performance is attained with an R
value that provides a full-scale shunt voltage range
of 50mV to 100mV. Maximum input voltage for
accurate measurements is (V
S
S
minimize voltage loss in the supply line. For most
GND
provide better accuracy at lower currents by
+2.7V to +18V
V+
S
OUT
0.01 F
by
m
the
S
– 0.2)/Gain.
0.1 F
m
voltages
www.ti.com
S
, depends
on
the
S