Advanced MOSFETs Improve Power Conversion In 48-V Mild Hybrid Systems
by Filippo Scrimizzi, Carmelo Mistretta and Giusy Gambino, STMicroelectronics, Catania, Italy, How2Power Today, Jun 15 2021
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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