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INA216A3YFFT Datasheet(PDF) 9 Page - Texas Instruments |
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INA216A3YFFT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page V OUT IN- IN+ GND R SHUNT INA216 Load V CM R P R P V OUT IN- IN+ GND R SHUNT INA216 Load V = 1.8 V to 5.5V CM V OUT IN- IN+ GND R SHUNT INA216 Load V CM R P R P INA216 www.ti.com SBOS503B – JUNE 2010 – REVISED JUNE 2010 APPLICATION INFORMATION Basic Connections Figure 18 shows the basic connections of the INA216. 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. Figure 20. Shunt Resistance Measurement Using a Kelvin Connection Power Supply The INA216 does not have a dedicated power-supply pin. Instead, an internal connection to the IN+ pin serves as the power supply for this device. Because Figure 18. Typical Application the INA216 is powered from the IN+ pin, the common-mode input range is limited on the low end Figure 19 illustrates the INA216 connected to a shunt to 1.8V. Therefore, the INA216 cannot be used as a resistor with additional trace resistance in series with low-side current shunt monitor. the shunt placed between where the current shunt monitors the input pins. With the typically low shunt Selecting RS resistor values commonly used in these applications, even small amounts of additional impedance in series The selection of the value of the shunt resistor (RS) to with the shunt resistor can significantly affect the use with the INA216 is based on the specific differential voltage present at the INA216 input pins. operating conditions and requirements of the application. The starting point for selecting the resistor is to first determine the desired full-scale output from the INA216. The INA216 is available in four gain options: 25, 50, 100, and 200. By dividing the desired full-scale output by each of the gain options, there are then four available differential input voltages that can achieve the desired full-scale output voltage, given that the appropriate gain device is used. With four values for the total voltage that is to be dropped across the shunt, the decision on how much of a drop is allowed in the application must be made. Most applications have a maximum drop allowed to ensure that the load receives the required voltage necessary to operate. Assuming that there Figure 19. Shunt Resistance Measurement are now multiple shunt voltages that are acceptable Including Trace Resistance, RP (based on the design criteria), the choice of what value shunt resistor to use can be made based on Figure 20 shows a proper Kelvin, or four-wire, accuracy. As a result of the INA216 auto-zero connection of the shunt resistor to the INA216 input architecture, the input offset voltage is extremely low. pins. This connection helps ensure that the only However, even the 100mV maximum input offset impedance between the current monitor input pins is voltage specification plays a role in the decision of the shunt resistor. which shunt resistor value to choose. With a larger shunt voltage present at the current shunt monitor input, less error is introduced by the input offset voltage. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): INA216 |
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