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TPS65217 switching frequency......

Mark Santacesaria68
Prodigy 100 points

does anyone have experience in higher switching frequency settings? e.g. > 2mhz....  I understand the higher rates result in higher losses but how can i quantify the effects?  thanks

i guess to be more specific....i need to understand heating as well as the reduced range of Vin.....

  • 0
    TI__Genius 16870 points

    Hi Mark,

    You will need to add up all the losses in-order to quantify the increased loss. One key point to note is that the losses will be greater during the switching not the DC loss because the increased frequency will allow you to reduce the size of the inductor and thus, decrease the DCR of the inductor and actually achieve better efficiency at high DC loads.

    Losses to add together:

    • driver losses
    • catch diode, if applicable
    • Inductor core losses

    Rough calculations for driver losses are the gate drive voltage x fsw + Qgfet. Add both HS and LS for synchronous SMPS and include catch diode for asynchronous. Inductor core loss can be requested from the your inductor manufacturer once you provide the certain operation conditions. You could include the losses across the caps but, they are typically miniscule compared to the inductor and the driver.