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BTS7200-4EPA Datasheet(PDF) 46 Page - Infineon Technologies AG |
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BTS7200-4EPA Datasheet(HTML) 46 Page - Infineon Technologies AG |
46 / 62 page Data Sheet 46 Rev. 1.00 2020-02-24 BTS7200-4EPA PROFET™+2 12V Diagnosis Figure 35 adds the behavior of SENSE signal to the timing diagram seen in Figure 28, while Figure 36 shows the relation between IIS = IL / kILIS, IIS(SAT) and IIS(FAULT). Figure 35 SENSE behavior in Fault condition Figure 36 SENSE behavior - overview 9.3 Diagnosis in OFF state When a power output stage is in OFF state, the BTS7200-4EPA can measure the output voltage and compare it with a threshold voltage. In this way, using some additional external components (a pull-down resistor and a switchable pull-up current source), it is possible to detect if the load is missing or if there is a short circuit to battery. If a Fault condition was detected by the device (the internal counter has a value different from the reset value, as described in Chapter 9.2.2) a current IIS(FAULT) is provided by IS pin each time the channel diagnosis is checked also in OFF state. t IN tRETRY Short circuit to ground IL 0 1 nRETRY(CR) Internal counter nRETRY(CR) + nRETRY(NT) nRETRY(CR) + (nRETRY(CYC) * nRETRY(NT)) tDELAY(CR) tRETRY 0 nRETRY(CR) nRETRY(NT) "retry" cycle nRETRY(NT) t t t Diagnosis_PROFET_IISFAULT.emf t DEN t IIS IIS(FAULT) IIS(FAULT) IL / kILIS nRETRY(CYC) IIS(FAULT) Diagnosis_PROFET_IISFAULT_IISSAT.emf IIS IL IIS(SAT) IIS(FAUL T) IL / kILIS IIS(SAT),min = IIS(FAUL T),min IIS(FAUL T),max IIS(SAT),max IL(OVL) |
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