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BTS7020-2EPA Scheda tecnica(PDF) 42 Page - Infineon Technologies AG |
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BTS7020-2EPA Scheda tecnica(HTML) 42 Page - Infineon Technologies AG |
42 / 58 page Data Sheet 42 Rev. 1.00 2017-08-24 BTS7020-2EPA PROFETTM+2 Diagnosis 9.2.2 Fault Current (IIS(FAULT)) As soon a protection event occurs, changing the value of the internal retry counter (see Chapter 8.3 for more details) from its reset state, a current IIS(FAULT) is provided by pin IS when DEN is set to “high” and the affected channel is selected. The following 3 situations may occur: • if the channel is ON and the number of retries is lower than “nRETRY(CR) + nRETRY(CYC) * nRETRY(NT)”, the current IIS(FAULT) is provided for a time tIS(FAULT)_D after the channel is allowed to restart, after which IIS = IL / kILIS (as shown in Figure 35). During a retry cycle (while timer tRETRY is running) the current IIS(FAULT) is provided each time the channel diagnosis is checked • if the channel is ON and the number of retries is equal than “nRETRY(CR) + nRETRY(CYC) * nRETRY(NT)”, the current IIS(FAULT) is provided until the internal counter is reset (either by expiring of tDELAY(CR) time or by DEN pin pulse, as described in Chapter 8.3.1) • if the channel is OFF and the internal counter is not in the reset state, the current IIS(FAULT) is provided each time the channel diagnosis is checked Figure 35 IIS(FAULT) at Load Switching Figure 36 adds the behavior of SENSE signal to the timing diagram seen in Figure 28, while Figure 37 shows the relation between IIS = IL / kILIS, IIS(SAT) and IIS(FAULT). t IN IL 0 1 Internal counter t t Diagnosis_PROFET_IISFAULT_load.emf t DEN t IIS IIS(FAULT) IL / kILIS tIS(FAULT)_D 2 IIS(FAULT) 0 IL(OVL) |
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