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LMZ22010: External Clock Synchronization ON/OFF

Hirotsugu Kobayashi
Mastermind 8485 points
Part Number: LMZ22010
Other Parts Discussed in Thread: LMZ31710

Hi, team.

Can LMZ22010 be used which the external clock synchronous function is changed during operation?

Best Regards,

  • 0
    TI__Mastermind 18940 points
    Hello Kobayashi-san,

    Could you please describe the use case in a bit more detail?

    Do you mean changing the synchronization frequency while the part is running? If this is the question, then yes, you can do that.

    If you want to stop the synchronization and revert back to the internal clock while in operation, you can "park" the sync signal low and that should force the part to work with internal clock.
    Do not "park" the sync signal high - this will force the part to stay off, as described in the note on page 14 of the datasheet.

    Let me know if this helps or if I misunderstood your question.

    Regards,
    Denislav
  • 0 in reply to Denislav Petkov
    Mastermind 8485 points
    Hello Denislav,
    I'd like to change the external clock synchronization and internal clock alternately while in operation.
    Can both mode mode be changed smoothly?
    It isn't recommended to switch from a CLK mode to a RT mode in LMZ31710, but is it possible by LMZ22010?

    Best Regards,
    Kobayashi
  • 0 in reply to Hirotsugu Kobayashi
    TI__Intellectual 1155 points

    Hello Kobayashi,

    Denislav and me took two measurements. The first one is switching from internal clock to a lower frequency external clock(~250kHz), the second one to a higher frequency external clock (~500kHz).

    The Graph shows you the external clock signal and the behavior of the inductor current and the output voltage on this "transient". It needs about 20 cycles to stabilize to the new frequency. You can expect about 50mV of transient on the output ( depending on the step in frequency).

    Have a nice day,

    Michael