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Load Dump and Cranking Protection for …
ApplicationReportSNVA681A March2015 LoadDumpandCrankingProtectionforAutomoti veBacklightLEDP owerSupplyAtulSinghABSTRACTA utomotiveelectronicsystemscan be subjectedto overvoltageprotectionis particularlycommoninautomotive12 V and 24 V systemswherepeakloaddumptransientscan be as highas 60 V. Crankingconditionsagsthe batteryvoltageto a low valuewhenthe batteryis supplyingcurrentto an powersupplydesignusingLM5088-Q1(wideinpu trangenonsynchronousbuckcontroller)with protectionfor loaddump,reversepolarityand cold crankingconditionsconduciveto the of Figures1 TypicalBatteryVoltageProfileUndera = 10 F at the Output(DelayedResponse)..69 ResponseTimeMeasurementWithC2 = 1 F at the Output(FastResponse)..610 ApplicationSchematic:AutomotivePowerSupp lyfor of Tables1 TypicalValuesof the UnsuppressedISO7637-2:2004[1]Pulse5 (loaddumppulse).
Application Report SNVA681A–March 2015 Load Dump and Cranking Protection for Automotive Backlight LED Power Supply AtulSingh ABSTRACT Automotive electronic systems can be subjected to wide input voltage variations resulting from cold
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