Advanced MOSFETs Improve Power Conversion In 48-V Mild Hybrid Systems

Focus:

In 48-V mild hybrid automotive platforms, the 48-V Li-ion battery has the capability to feed the high-power systems in the car and through the 48-V to 12-V dc-dc converter, the 48-V battery can recharge the 12-V lead-acid battery, which powers the low-power systems. This article explains how the dc-dc converter’s electrical requirements and its multiphase synchronous buck topology influence the selection of its power MOSFETs. It then demonstrates the levels of performance that are achieved when using ST’s 80-V to 100-V STripFET F7 MOSFETs in this converter application and how a new MOSFET technology from ST will take this performance further.

What you’ll learn:

• How to understand the electrical requirements for a 48-V to 12-V multiphase buck converter in mild-hybrid automotive applications
• How to optimize performance of a 48-V to 12-V buck converter for mild hybrids using ST’s STripFET F7 MOSFETs and newer MOSFETs expected in 2022

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Author & Publication:

Filippo Scrimizzi, Carmelo Mistretta and Giusy Gambino, STMicroelectronics, Catania, Italy, How2Power Today, Jun 15 2021

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