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BTS7040-2EPA Fiches technique(PDF) 44 Page - Infineon Technologies AG |
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BTS7040-2EPA Fiches technique(HTML) 44 Page - Infineon Technologies AG |
44 / 58 page Data Sheet 44 Rev. 1.00 2017-08-24 BTS7040-2EPA PROFETTM+2 Diagnosis 9.3.1 Open Load current (IIS(OLOFF)) In OFF state, when DEN pin is set to “high” and a channel is selected using DSEL pin, the VDS voltage is compared with a threshold voltage VDS(OLOFF). If the load is properly connected and there is no short circuit to battery, VDS ~ VS therefore VDS > VDS(OLOFF). When the diagnosis is active and VDS ≤ VDS(OLOFF), a current IIS(OLOFF) is provided by IS pin. Figure 38 shows the relationship between IIS(OLOFF) and IIS(FAULT) as functions of VDS. The two currents do not overlap making always possible to differentiate between Open Load in OFF and Fault condition. Figure 38 IIS in OFF State It is necessary to wait a time tIS(OLOFF)_D between the falling edge of the input pin and the sensing at pin IS for Open Load in OFF diagnosis to allow the internal comparator to settle. In Figure 39 the timings for an Open Load detection are shown - the load is always disconnected. Figure 39 Open Load in OFF Timings - load disconnected Diagnosis_PROFET_IISOLOFF.emf IIS VDS IIS(OLOFF) VDS(OLOFF) IIS(FAULT) t IN t DEN VOUT ~ VS tIS(OLOFF)_D t IIS(OLOFF) IIS IIS(OL) VDS(OLOFF) t Diagnosis_PROFET_OLOFF_time.emf Load connected |
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