Shifting from 12-V to 42-V systems in automotive applications

Abstract

This paper will address the shift from a 12-V to a 42-V system voltage in automobiles and its implications for applications using discrete components. The effects of rising voltage levels, such as higher power-handling requirements and side-by-side operation of 12-V and 42-V subsystems during the transition, will be discussed. This paper also will present basic definitions of the two Boardnet voltages, a comparison of the components and electrical characteristics required for each system, an analysis of the types of applications made possible with the higher voltages, and a description and schematics of similarly configured applications. A brief reference to current products that help to address the specific engineering issues accompanying these higher-voltage systems also will be included.