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Lamp inrush current computation for switch usage

Posted: 14 Aug 2013 ?? ?Print Version ?Bookmark and Share

Keywords:over-current protection? eXtreme? Switch? MOSFETs? 10XS3435?

This application note tackles the transient over-current protection for the Generation III eXtreme Switch family of devices, when used with automotive lighting applications.

For example, the 10XS3435 is one in a family of devices designed for low-voltage automotive lighting applications. Its four low RDS(ON) MOSFETs (dual 10M? and dual 35M?) can control four separate 55 W/28 W bulbs, and/or Xenon modules, and/or LEDs.

Programming, control and diagnostics is accomplished using a 16bit SPI interface. Its output with selectable slew-rate, improves electromagnetic compatibility (EMC) behaviour. Additionally, each output are controlled through SPI for pulse-width modulation (PWM). The 10XS3435 allows the user to program via the SPI the fault current trip levels and the duration of acceptable lamp inrush. The device has a Fail-safe mode to provide safe functionality of the outputs in case of MCU damage. For feature information, refer to the device data sheets.

View the PDF document for more information.

Originally published by Freescale Semiconductor Inc. at as "Lamp Inrush Current Computation Tool for Optimal eXtreme Switch Usage".

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