Automotive Load Dump Protection

PublishTime：2021-04-16

Modern automotive designs use a mass of electronics, such as control units, infotainment systems and sensors, all being powered by the car battery and the alternator. During the standard operation, several unwanted EMI disturbances arise from the various sources such as alternator, ignition systems, inductive load switching and load dump transient surges, which can be harmful to vehicle electronic devices. They can degrade performance, lead to malfunction of sensors or even permanently destroy electronic devices which could affect complete system’s reliability.A major challenge out of these is to protect these electronics against the high energy load dump transient events, which is the most severe disturbance having large transient peaks, with duration of several milliseconds.A load dump transient is the voltage surge generated when the battery is disconnected while the alternator is connected. This typically happens if a discharged car battery is powered up by a second one and afterwards jump leads are removed. The peak voltage of this surge may be as high as 120 V and the surge may take up to 400 ms to decay. It is typically clamped to 40 V in 12 V vehicles (cars) and about 60 V in 24 V systems (trucks). Diotec offers various TVS product families for load dump protection according to ISO 16750-2:2012(E), both for applications without centralized load dump suppression (according to standard Table 5, Test A) and for those with centralized suppression(Table 6, Test B).The new 6.6SM8Z series with 6.6 kW peak pulse power in DO-218AB is already available, it will soon be complemented by the 4.6SM6Z series with 4.6 kW. Both versions are qualified according to AEC-Q101. The 5KP represents an alternative in axial lead package, it allows up to 5 kW at the usual rating with 10/1000μs pulses. Classical alternator rectifier diodes in pressfit packages are the BYZ35 and BYZ50, which we offer especially for the after sales market. They offer a suppressor characteristic and thus provide alternator rectification and centralized suppression in one.The following block diagram shows the typical current path from the alternator via battery to the stabilized DC voltage for the on-board electronics, including the option for a parallel 48 V system.

Brand of Product：	DIOTEC
Part#：	4.6SM8Z... 、 6.6SM8Z... 、 LDP01... 、 LDP02... 、 5KP... 、 BYZ35... 、 BYZ50... 、 TGL34... 、 TGL41... 、 TGL61... 、 SMF... 、 P4SMAJ... 、 TPSMA6L... 、 P6SMBJ... 、 1.0SMBJ... 、 1.5SMCJ... 、 3.0SMCJ... 、 5.0SMCJ... More Part#
Product Category：	sensors 、 Load Dump Protection Diodes 、 TVS diodes 、 Diodes More
Application：	[ Automotive ] More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：	DO-218AB;D8 x 7.5;D²PAK;DO-213AA;DO-213AB;SOD-123FL;DO-214AC;SMAF;DO-214AA;DO-214AB
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2021/03/16
Version Number：	Version 02
Data Encoding：
Data Size：	1.1 MB

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