EMI compatible automotive switching regulator circuit design

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Overview:
EMI-compatible automotive switching regulators can be easily designed without the need to fully understand complex EMI. This article will explore the basic factors of successful implementation of switching regulators in an intuitive way without complex mathematical operations, including: slew rate control, filter design, component selection, configuration, noise spreading, and shielding.

The car itself is constantly changing, as is the electronics that drive the car. The most notable of these is plug-in electric vehicles (PEV), which replace the gas tank and internal combustion engine with a 300- to 400-V lithium-ion battery and a three-phase propulsion motor. Precision battery pack power monitoring, regenerative braking system and sophisticated transmission control optimize battery life so that the frequency of battery charging is reduced. In addition, today's electric vehicles or other types of vehicles have many electronic modules that enhance performance, safety, convenience and comfort. Many mid-range cars are equipped with advanced Global Positioning System (GPS), integrated DVD players and high-performance sound systems.

Accompanying these advanced devices is the need for higher processing speeds. As a result, today's cars incorporate high-performance microprocessors and DSPs that reduce the core voltage to 1V and increase the current by 5A. There are many challenges in generating such voltages and currents for automotive batteries between 6V and 40V, one of which is to meet the stringent standards of electromagnetic compatibility testing (EMC). Linear regulators used to be the primary method used to convert automotive battery voltages into regulated supply voltages, but they are now out of date. More precisely, the linear regulator reduces the output voltage and causes the load current to increase. Switching regulators are becoming more widely used, with concerns about electromagnetic interference (EMI) radio frequency and the importance of safety systems.
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