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L9779WD 数据表(PDF) 86 Page - STMicroelectronics |
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L9779WD 数据表(HTML) 86 Page - STMicroelectronics |
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86 / 170 page  Functional description L9779WD 86/170 DocID027452 Rev 5 Channel “off” Short to GND: Not available. Short to VB & open load: In open load condition an internal circuit drives the OUTx voltage to VOUTOPEN with a maximum pull-up/down current of IOUT_PU and IOUT_PD. Diagnosis is done comparing driver output voltage with internal voltage thresholds VHVT and VLVT: if the voltage is above VHVT a short to VB is detected, if the voltage is above VLVT and below VHVT an open load is detected and if the voltage is below VLVT no fault is present. Diagnosis status is masked for Td_mask time after the off event occurs to allow the output voltage to reach the proper value. Short to GND and Open load are filtered with TFILTERdiagoff time. Diag status is latched and reset at every Read Diag operation. Figure 55. Short to VB & open load diagram |
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