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INA270AQDRQ1 Datasheet(PDF) 8 Page - Texas Instruments |
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INA270AQDRQ1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page A1 A2 Single-Pole Filter Capacitor +2.7 V to +18 V 5 kW 5 kW 96 kW R L PRE OUT BUF IN GND OUT IN– IN+ V+ Load −16 V to +80 V Supply R S INA270 0.01 µF 0.1 µF INA270-Q1, INA271-Q1 SBOS401B – JULY 2007 – REVISED FEBRUARY 2010 www.ti.com APPLICATION INFORMATION Basic Connection Figure 1 illustrates the basic connection of the INA270 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 mF and 0.1 mF in value should be placed close to the supply pins. Although not mandatory, an additional 10-mF electrolytic capacitor placed in parallel with the other bypass capacitors may be useful in applications with particularly noisy supplies. Figure 1. INA270 Basic Connections 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 5 V, whereas the load power-supply voltage is up to 80 V. The output voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin. Selecting RS The value chosen for the shunt resistor, RS, depends on the application and is a compromise between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of RS provide better accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale shunt voltage range of 50 mV to 100 mV. Maximum input voltage for accurate measurements is (VS – 0.2)/Gain. Transient Protection The –16-V to 80-V common-mode range of the INA270 and INA271 is ideal for withstanding automotive fault conditions ranging from 12-V battery reversal up to 80-V transients, since no additional protective components are needed up to those levels. In the event that the INA270 and INA271 are exposed to transients on the inputs in excess of their ratings, external transient absorption with semiconductor transient absorbers (zeners or Transzorbs) are necessary. 8 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): INA270-Q1 INA271-Q1 |
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