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LMG5200: Question regarding Dead Time

Carlos Silva85
Expert 4915 points
Part Number: LMG5200

A customer of mine is evaluating the LMG5200 and trying to figure out the best dead time circuit with least temperature drift for LMG5200 - The input threshold specification for LMG5200 is over free air temperature range:

The Schmitt inverter buffer used in the EVM design has a more wide threshold over temperature:

Would it not be better to remove U4A and U4B in the EVM dead time circuit below, due to that the turn on/off threshold variation is less in LMG5200 than in the Schmitt inverter over temperature?

In the EVM, 4 Schmitt inverters are used to generate the dead time? Is this necessary? 

  • 0
    TI__Expert 3225 points

    Hello Carlos,

    Thanks for asking and the interest on GaN. As this is an EVM, we preferred to make it more generic for customers. Some people have different voltage level of input, and we preferred to use a buffer chip to do the voltage level translation. However, you will not really need so many schmitter trigger. Like U4 can be removed, as well as U3, as long as you have good input signals , and the logic levels are correct.

    Thanks and regards,

    Lixing