High-Frequency Automotive Power Supplies

Focus:

The use of high-frequency switching regulators is desirable in automotive applications because it allows the shrinking of voltage regulator circuits. However, switching regulator ICs used in automotive designs must be able to withstand a number of overvoltage conditions, implying the need for ICs with high-voltage capability. But high-frequency switching and high-voltage capability are difficult to achieve in the same IC. This application note presents techniques for combining low-voltage, high-frequency switching regulators with external protection circuitry that enables the low-voltage switching regulators to function reliably in automotive applications. Article includes discussion of the causes of steady-state and transient overvoltages and OEM requirements for transient voltage suppression (conducted immunity tests), which are based on the ISO7637 standard.

What you’ll learn:

• How to apply high-frequency switching regulators in automotive designs
• How to protect low-voltage switching regulator ICs from automotive overvoltage conditions
• How to understand automotive OEM requirements for suppression of overvoltage transients

Notes:

Maxim Integrated Products Application Note 3893

View the Source

Author & Publication:

no author specified, Maxim Integrated Products, Vendor website, Jul 17 2007

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