Automotive TI Tech Days 2020

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4.9 Addressing EMI challenges for high side switches and motor drivers in body electronics

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August 21, 2020

2020 Automotive TI Tech Day session

Semiconductor power switches and motor drivers are continuing to replace relays for driving various loads in cars such as headlight bulbs, window motors and wiper motors. This is because semiconductor based solutions not only result in smaller form factor and lower weight PCBs but will also enable fine control of the actuators which otherwise is not possible with relays. For example, semiconductor solutions enable using PWM method to control the speed of the window motor as the window glass nears end of travel. While these enhanced features enable better overall solution, they also introduce technical challenges. One such challenge is electromagnetic interference (EMI). Solving EMI challenges involves multi-faceted approach, with waveform shape being one aspect of the total EMI solution. In this presentation, we will discuss using simulations how the shape of the PWM waveforms impacts conducted emissions

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