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STSPIN830 データシート(PDF) 13 Page - STMicroelectronics |
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STSPIN830 データシート(HTML) 13 Page - STMicroelectronics |
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13 / 27 page  Figure 7. Overcurrent and short-circuit protections management FAULT_MCU MCU EN_MCU V EN Power stage FAULT VIH V VIL Overcurrent protection ENABLED DISABLED ENABLED CEN REN t tDIS t t V EN\FAULT DEVICE RELEASE EN OC\SC THSD FAULT AM040384 RELEASE RELEASE charge OCSD discharge The total disable time after an overcurrent event is set sizing properly the external network connected to EN \FAULT pin (refer to Figure 8. Disable time versus REN and CEN values (VDD = 3.3 V) ) and it is the sum of the discharging and charging time of the CEN capacitor: Equation 2 (2) tDIS = tdischarge + tcharge Considering tdischarge is normally significantly lower than tcharge, its contribution is negligible and the disable time is almost equal to tcharge only: Equation 3 (3) tDIS≅REN×CEN×ln VDD−REN×IPD −VRELEASE VDD−REN×IPD −VIH Where VDD is the pull-up voltage of REN resistor. The recommended value for REN and CEN are respectively 39 kΩ and 10 nF that allow obtaining 200 µs disable time. STSPIN830 Device protections DS12584 - Rev 2 page 13/27 |
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