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LMG5200: for 20Vin 5Iin 10MHz operation?

Part Number: LMG5200

Hi team,

My customer is considering 2pcs of LMG5200 for a full bridge, 20Vin application.  The input current is limited to 5A. Can LMG5200 go up to 10MHz? I searched that it can go to 7MHz in E2E, but the VDD current is 40mA with ~10kHz in below figure. Would 10MHz be overheated?

Thanks.

  • Hi Jerry, 

    The LMG5200 internal gate driver can support switching frequencies slightly higher than 10 MHz while maintaining functional operation. The reason why the 10 MHz limit is included in the data sheet is due to thermal concerns at the higher frequencies. There will be a noticeable change in temperature difference when operating at 10 MHz compared to lower switching frequencies. However, this 10 MHz switching frequency spec is listed in the data sheet because the gate driver has been tested at that level with no major concerns. 

    Aside from the gate driver temperature increase, it is also important to consider the thermal implications of switching the GaN devices at this frequency. If the customer is using a soft-switching scheme, it is acceptable to drive the switching frequency up to 10 MHz. However, if hard-switching, careful power loss analysis must be done to ensure that the GaN devices are within their thermal limitations. 

    Best Regards,

    John