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L9779WD 数据表(PDF) 70 Page - STMicroelectronics |
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L9779WD 数据表(HTML) 70 Page - STMicroelectronics |
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70 / 170 page  Functional description L9779WD 70/170 DocID027452 Rev 5 6.11.1 Ignition pre-drivers functionality description The 4 ignition pre-drivers are push-pull output with diagnosis and over current protection circuit. They can drive IGBT Darlington transistors. The load is switched on with a current and switched off with I_LS_cont current. They are driven via MicroSecond Channel. When Reset_L9779 signal or OUT_DIS bit is asserted, output IGNx becomes high impedance. By MSC command it is possible to have the low-side stage always off, in this case there is an external pull down resistor that discharges. The IGNx output in Off phase. This Bit is present in config2(0) and its name is LS_IGN_OFF. Table 29. Ignition pre-drivers electrical characteristics Pin Symbol Parameter Test condition Min Typ Max Unit IGN1 to 4 VDD5 Supply voltage range Info only 4.9 - 5.1 V Vign Output voltage high level I_cont = 15 mA 4.35 - V Ileak_out Leakage current - -10 - 10 µA -I_lim High-side current limitation - 19 - 33 mA I_LS_cont LS path continuous current capability Add also the RDSON Test -- 30 mA I_LS_RD S on LS RDSON - 3 - 14 Ω IOVC High side over current detection - 7 - 14 mA VLVT Output short-circuit to Gnd threshold voltage -1.6 1.8 2 V Vign_scb SCB detection voltage - VDD5 +0.1V - VDD5 +2V - Iol OL detection current - 100 - 850 µA Tdon Output on delay time CIgn = 10 nF - - 10 µs Tign_filt OVC/Open load diagnosis filter time, Test by scan -50 - 100 µs Tr Output on rise time CIgn = 10 nF - - 10 µs Tdoff Output off delay time CIgn = 10 nF - - 10 µs Tf Output off fall time CIgn = 10 nF - - 10 µs Rload Resistive load For info only 1 - 10 k Cout Output capacitance loads For info only 4 - 15 nF |
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