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L9177 数据表(PDF) 35 Page - STMicroelectronics |
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L9177 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 49 page  DocID17617 Rev 1 35/49 L9177 Functional description 48 Figure 23. Low side driver diagnosis I-V relationship 4.5.5 Lamp driver on/off diagnosis In OFF condition diagnosis is the same as Low side, with Tmask 3.5 ms ±25 % and Tdgc_noise 3.6 μs ± 40 %, while in ON condition initial Inrush current is masked for Tmask_rush of 45 ms ±25 % then, if an over current fault occurs the drivers enters in current limitation condition for a digital filtering time Tdgc of 20 μs ±25 %, then it is switched OFF and the fault is latched. The channel is turned ON again by input command transition. The latched fault is cleared on request via SPI. Over current fault has higher priority with respect to OFF condition faults. |
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