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Nickelgrass
Nickelgrass
Senior
February 5, 2025
Question

L6920D what happens if Vin = Vout

  • February 5, 2025
  • 1 reply
  • 903 views

Hello,

what would happen if I have a fixed 5V output L6920D boost converter and the input voltage is 5V. Will it just pass through?

Thanks

1 reply

Peter BENSCH
Peter BENSCH
Technical Moderator
February 5, 2025

Well, the control section has a minimum off time and a maximum on time, so it cannot simply run through with a duty cycle of 100%.

Does it answer your question?

Regards
/Peter

    Andrew Neil
    Andrew Neil
    Super User
    February 5, 2025

    but the datasheet does state, "0.6 TO 5.5V OPERATING INPUT VOLTAGE" (my emphasis):

    AndrewNeil_0-1738753614900.png

     

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Peter BENSCH
    Peter BENSCH
    Technical Moderator
    February 5, 2025

    Even if the data sheet shown by @Andrew Neil contains almost the same data as the current L6920DB (limit min 750mA) and L6920DC (limit min 550mA), it is out of date.

    Unfortunately, I don't have an STEVAL-ISA077V1 hand to test this quickly. I am also of the opinion that the L6920D should simply switch the voltage through. During a test, the values mentioned should actually be visible at the output.

    Regards
    /Peter

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