Recommendations for Reliable Switching Performance using ON Semiconductor 40V and 80V Automotive Power Modules Using Shielded-Gate MOSFETs
●Summary:
■The ON Semiconductor automotive qualified power module family(AutoSPM) was introduced in 2008 and since then has experienced steady improvements, including most recently shielded−gate MOSFETs in the 40 V and 80 V nodes. These MOSFETs further optimize the figure of merit between on resistance RDS(on) and gate charge Qg, and thus extends the modules’ capability for high frequency and high current switching. This application note provides recommendations on the selection of gate resistors and limits to the dc link bus inductance necessary to obtain the full benefit of this new MOSFET technology while maintaining safe operation in hard−switched inverter system designs.
■Safe switching of the very fast shielded−gate MOSFETs requires a good balance of speed and external stray inductance to ensure safe operation, especially as inverter output current levels are pushed to the full capability of the modules. To explore the most effective use of these modules for high current and high speed switching applications,ON Semiconductor has utilized extensive bench testing to provide guidance to our customers. This application note describes the process used to arrive at our guidance, including:
◆Running an experimental benchtop inverter system to explore operating limits and create failures to define the critical parameters that lead to the failures
◆Identify the root cause of the failures
◆Provide guidance on selection of gate resistors for (especially)turn−off and the impact of dc capacitor and bus bar parasitic inductance in order to ensure safe operation at the limits of the datasheet performance
■Careful adherence to the guidance provided herein will ensure reliable operation of inverters employing the AutoSPM line of shielded−gate MOSFET power modules.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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January, 2020 |
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Rev. 0 |
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AND90006/D |
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1.3 MB |
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