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Automotive high frequency power supply design

2013-09-22
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　　Abstract: It is very difficult to combine high-frequency switching circuits with high-voltage circuits in IC design. However, it is entirely possible to design high-frequency automotive power supplies provided that appropriate high-voltage protection is provided. As more and more electronic devices are integrated into automobiles, the need for high-frequency operation is becoming more and more urgent. This article discusses several methods for protecting low-voltage circuits in the noisy environment of automobiles, including test results of noise suppression. Overview For power system designers, the increase in circuit density is both a challenge and an opportunity. Most automotive electronic modules require low-voltage power supplies, such as 5V and 3.3V. If the battery voltage is converted to the required voltage through a linear step-down solution, too much energy will be consumed. Excessive power dissipation will increase the difficulty and cost of designing a thermal management system. As the operating speed of processors and ASICs increases, more power is required, which requires the use of complex and efficient switching converters to replace simple low-cost, low-efficiency linear power supplies.

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