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TPS61193-Q1: Spread Spectrum Function

hideyuki sakai
Mastermind 6250 points
Part Number: TPS61193-Q1

Dear, Sir.

My customer is designing the system using TPS61193-Q1, now.

They are making following questions regarding Spread Spectrum function.

Please give your advice.

1. Modulation Frequency.

  1kHz is defined on the datasheet. The other side, 1.875kHz is described on

  the EVM user's guide. Which is correct?

2. Efficiency of Spread Spectrum.

  They are considering to utilize Spread Spectrum function to reduce 2nd & 3rd

  harmonic within radio noise band(fSW = 400kHz).

  Please show the efficency of Spread Spectum ON/OFF using spectrum analyzer

  waveform, etc if you have.

Best Regards,

H. Sakai

  • 0
    TI__Expert 5475 points

    Hi,

    1. Modulation frequency

    Thanks for pointing out this mistake. Please allow me some time to check which is the right one. But may I ask why customer is asking about the modulation frequency? Do they have any concern on this parameter?

    2. Efficiency of spread spectrum

    Below is the frequency spectrum of the device when spread spectrum is disabled/enabled. Fsw=400kHz.

    Disable spread spectrum:

    Enable the spread spectrum

  • 0 in reply to Shirley He
    Mastermind 6250 points
    Dear, Shirley-san.

    Thank you for your valuable & helpful information.

    In Japan, we must submit "仕様書" which includes the datasheet contents previous
    the mass-production. So, they are sensitive the description mistakes. No concerning about it.
    This is the reason why they pointed it out at this time.

    I am hoping your reply regarding #1.

    Best Regards,
    H. Sakai
  • 0 in reply to hideyuki sakai
    TI__Expert 5475 points
    Hi Sakai-san,

    I have checked and confirmed the right modulation frequency should be 1kHz.