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TSX920 Datasheet(PDF) 21 Page - STMicroelectronics |
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TSX920 Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 32 page  TSX920, TSX921, TSX922, TSX923 Application information DocID024310 Rev 4 21/32 5.7 High-side current sensing TSX92x rail to rail input devices can be used to measure a small differential voltage on a high side shunt resistor and translate it into a ground referenced output voltage. The gain is fixed by external resistance. Figure 41: High-side current sensing configuration Vout can be expressed as follows: Equation 8 Assuming that Rf2 = Rf1 = Rf and Rg2 = Rg1 = Rg, Equation 8 can be simplified as follows: Equation 9 With the TSX92x operational amplifiers, the high side current measurement must be made by respecting the common mode voltage of the amplifier: (VCC-) - 0.1 V to (VCC+) + 0.1 V. If the application requires a higher common voltage please refer to the TSC high side current sensing family. V ou t R shun t I 1 R g2 R g2 R f2 + 1 R f1 R g1 – × I p R g2 R f2 R g2 R f2 1 R f1 R g1 l n R f1 V io 1 R f1 R g1 + – – + = + + × × + × V out R shunt I R f R g × V io 1 R f R g – R f I io × + = + |
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