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Spread Spectrum Clock for Clock Synchronous

Intellectual 2980 points

Replies: 3

Views: 77

Hi Expert,

May I know if customer can use spread spectrum clock to be clock source for buck converter's clock synchronization?  e.g. TPS54541(CLK)/LMZM33606(SYNC)/LMZM23601(SYNC)

Thanks,

Allan  

  • Hi Allan,

    Since spread spectrum is simply modulating the frequency to spread the energy across multiple frequencies, the customer should be able to emulate external spread spectrum with their external clock source so long as the device enables external synchronization.

    Regards,

    Jimmy

  • In reply to Jimmy Hua:

    Hi Jimmy,

    If the spread spectrum is quite large (~40% fsync), will it impact the PLL out of lock? What's maximum acceptable clock jitter for these parts?

    Thanks,

    Allan 

  • In reply to Allan Fan:

    Hi Allan,

    TI devices that have spread spectrum as a feature have been defined and tested to be stable. In the case where customer is using a device (not specifically tested for spread spectrum) to emulate spread spectrum, the customer would have to check and verify their design on how much jitter can be allowed before the internal loop becomes unstable which includes understanding how much jitter is too much.

    Regards,

    Jimmy

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