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AUIPS7121R Datasheet(PDF) 7 Page - International Rectifier |
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AUIPS7121R Datasheet(HTML) 7 Page - International Rectifier |
7 / 13 page AUIPS7121R Current sensing accuracy Iout Ifb Ifb leakage Ifb2 Ifb1 Iout1 I offset Iout2 The current sensing is specified by measuring 3 points : - Ifb1 for Iout1 - Ifb2 for Iout2 - Ifb leakage for Iout=0 the Ifb for any Iout value using : , the accuracy of the system will depends on the variation of Ratio_TC specified in page 4. The Ioffset variation depends directly on the Rdson : I offset@-40°C= I offset@25°C / 0.8 Maximum Vcc voltage with short circuit protection The maximum Vcc voltage with short circuit is the maximum voltage for which the part is able to protect itself under test conditions representative of the application. 2 kind of short circuits are considered : terminal and load short circuit. L SC R SC The parameters in the datasheet are computed with the following formula : Ratio = ( Iout2 – Iout1 )/( Ifb2 – Ifb1) I offset = Ifb1 x Ratio – Iout1 This allows the designer to evaluate Ifb = ( Iout + I offset ) / Ratio if Ifb > Ifb leakage For some applications, a calibration is required. In that case the I offset and the ratio over the temperature range. The ratio variation is given by I offset@150°C= I offset@25°C / 1.9 Out IPS Vcc L SC L supply 5µH R supply 10mohm Terminal SC 0.1 µH 10 mohm Load SC 10 µH 100 mohm R SC www.irf.com 7 |
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