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INA253 데이터시트(Datasheet) 14 Page - Texas Instruments

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부품명 INA253
상세내용  High Voltage, Bidirectional, Zero-Drift, Current-Shunt Monitor with Integrated 2-mΩ Precision Low Inductive Shunt Resistor
PDF  24 Pages
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제조사  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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 14 page
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+
±
REF2
REF1
VS
GND
OUT
PWM
Rejection
50k
50k
IS+
IS-
IN+
IN-
SH+
SH-
2mO
0.1%
14
INA253
SLOS954 – MAY 2018
www.ti.com
Product Folder Links: INA253
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Copyright © 2018, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The INA253 measures the voltage developed as current flows across the integrated low inductive current-
sensing resistor. The device provides reference pins to configure operation as either unidirectional or
bidirectional output swing. When using the INA253 for inline motor current sense or measuring current in an h-
bridge, the device is commonly configured for bidirectional operation.
9.1.1 Input Filtering
NOTE
Input filters are not required for accurate measurements using the INA253. Use of filters in
this location is not recommended. If filter components are used on the input of the
amplifier, follow the guidelines in this section to minimize the effects on performance.
Based strictly on user design requirements, external filtering of the current signal may be desired. The initial
location that can be considered for the filter is at the output of the current amplifier. Although placing the filter at
the output satisfies the filtering requirements, this location changes the low output impedance measured by any
circuitry connected to the output voltage pin. The other location for filter placement is at the current amplifier
input pins. This location satisfies the filtering requirement also, but the components should be carefully selected
to minimally impact device performance. Figure 11 shows a filter placed at the inputs pins.
Figure 11. Filter at Input Pins
External series resistance provide a source of additional measurement error, so keep the value of these series
resistors to 10-Ω or less to reduce loss of accuracy. The internal bias network shown in Figure 11 creates a
mismatch in input bias currents (see Figure 12) when a differential voltage is applied between the input pins. If
additional external series filter resistors are added to the circuit, a mismatch is created in the voltage drop across
the filter resistors. This voltage is a differential error voltage in the shunt resistor voltage. In addition to the
absolute resistor value, mismatch resulting from resistor tolerance can significantly impact the error because this
value is calculated based on the actual measured resistance.




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