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OA1ZHA Datasheet(PDF) 25 Page - STMicroelectronics |
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OA1ZHA Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 35 page  OA1ZHA, OA2ZHA, OA4ZHA Application information DocID025994 Rev 2 25/35 Vout can be expressed as follows: Equation 4 Assuming that Rf2 = Rf1 = Rf and Rg2 = Rg1 = Rg, Equation 4 can be simplified as follows: Equation 5 The main advantage of using the chopper of the OA1ZHA, OA2ZHA and OA4ZHA, for a low-side current sensing, is that the errors due to Vio and Iio are extremely low and may be neglected. Therefore, for the same accuracy, the shunt resistor can be chosen with a lower value, resulting in lower power dissipation, lower drop in the ground path, and lower cost. Particular attention must be paid on the matching and precision of Rg1, Rg2, Rf1, and Rf2, to maximize the accuracy of the measurement. 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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