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L9177 Datasheet(PDF) 35 Page - STMicroelectronics

No. de pieza L9177
Descripción Electrónicos  Peripheral on chip for low end engine control
PDF  49 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9177 Datasheet(HTML) 35 Page - STMicroelectronics

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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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