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January, 2020 − Rev. 0

1 Publication Order Number:

AND90006/D

Recommendations for

Reliable Switching

Performance using

ONSemiconductor 40V

and 80V 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 R

DS(on)

and gate

charge Q

, 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 data

sheet performance

Careful adherence to the guidance provided herein will ensure

reliable operation of inverters employing the AutoSPM line of

shielded−gate MOSFET power modules.

APPLICATION NOTE

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Figure 1. AutoSPM Module Photo

Figure 2. Pin Configuration

Figure 3. Internal Equivalent Circuit