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LMP8272 Datasheet(PDF) 11 Page - Texas Instruments |
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LMP8272 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 16 page VS = 4.75 to 5.5V OUT LMP8272 + - A1 GND +IN -IN A2 GAIN = 2 A1 A2 100 k: GAIN = 7 C1 VDC VDC + IRS1 PROPRIETARY LEVEL-SHIFT CIRCUITRY VDC RS1 I VDC VS = 4.75 to 5.5V OUT LMP8272 + - A1 GND +IN -IN A2 GAIN = 2 A1 A2 100 k: GAIN = 7 C1 RS1 VDC VDC - IRS1 I PROPRIETARY LEVEL-SHIFT CIRCUITRY OBSOLETE LMP8272 www.ti.com SNOSAP7F – AUGUST 2005 – REVISED APRIL 2013 The LMP8272 can be used for high side current sensing. The large common mode voltage range of this device allows it to sense signals outside of its supply voltage range. Also, the LMP8272 has very high CMRR, which enables it to sense very small signals in presence of larger common mode signals. The system in Figure 26 couples these two characteristics of the LMP8272 in an automotive application. The signal through RS1 is detected and amplified by LMP8272 in the presence of a common mode signal of up to 16V with highest accuracy. Figure 26. High Side Current Sensing LOW SIDE CURRENT SENSING Low side current measurements can cause a problem for operational amplifiers by exceeding the negative common mode voltage limit of the device. In Figure 27, the load current is returning to the power source through a common connection that has a parasitic resistance. The voltage drop across the parasitic resistances can cause the ground connection of the measurement circuits to be at a positive voltage with respect to the common side of the sense resistor. This will result in one or both of the inputs being negative with respect to the circuit’s ground. The LMP8272 has a wide extended input common mode voltage range of −2V to 16V and will function in this condition. Figure 27. Low Side Current Sensing Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMP8272 |
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