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TPS61021A: Data on noise/ripple with respect to load current and curve questions

David C
Expert 3350 points
Part Number: TPS61021A

Hello,

Is there data on noise/ripple with respect to load current?

Are there curves showing Vout undergoing the transition from regulating to supplying Vin as Vout, and vice versa?

Regards,
David

  • 0
    TI__Mastermind 40080 points

    The ripple doesn't direct propotion to the load current. In fact at the heavy load, when it works in the PWM mode,  the ripple is propotion to the output capacitance, it can be as low as even 10-20mV at heavy load. But if the load current is small, which makes the TPS61021 in PFM mode, then whatever the output capacitance, the output ripple is around 30-40mV.

    Not unsderstand what is the following sentence mean?

    Are there curves showing Vout undergoing the transition from regulating to supplying Vin as Vout, and vice versa?

     

  • 0
    TI__Expert 3350 points

    Hello,

    To clarify the sentence about “Vout undergoing the transition from regulating to supplying Vin as Vout”, it is my understanding that when Vin>Vout the boost converter switches from supplying a boosted output to passing through Vin to supply Vout. (For example, a battery that has a full charge voltage above the specified output voltage) We’d like to see what instabilities may exist in Vout when transitioning between these two modes of operation in both directions. That graph is not in the datasheet.

     Regards,

    David

  • 0 in reply to David C
    TI__Mastermind 40080 points
    We'll test it and show the waveform to you within today!
  • 0 in reply to David C
    TI__Mastermind 40080 points

    When TPS61021 shift from boost mode to pass through mode, or from pass through mode to boost mode, the waveform changes smoothly.  Please check the attached waveform.