• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 706 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65131: minimum Duty cycle

tateo yamashiro
Guru 10890 points
Part Number: TPS65131

Hi,

We got a question from customer about TPS65131.
Could you help us?

[Question]
They are considering to disable power save mode.
In this condition, when the duty cycle becomes less than the minimum duty cycle as the output current reduces, what is the behavior of the IC? Will the IC operate in pulse skip mode?

Best Regards,
tateo

  • 0
    TI__Expert 8010 points
    Hello Tateo,

    The duty cycle is dependent only from the input and the output voltage and keeps the same although the output current reduces.
    Pulse skip mode is dependent on the output current.
    Why do they consider to disable the power save mode?

    Best Regards.
    Ilona
  • 0 in reply to Ilona
    Guru 10890 points

    Thank you for your reply. The IC reduces ON time as the output current reduces in DCM. That means the Duty reduces as the output current reduces. When the ON pulse reaches minimum ON time, the IC will be pulse skip mode. How much is the minimum ON time?
    They are considering to use forced PWM mode. They want to know that how much the output current will the IC enter in pulse skip mode.

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Guru 65340 points
    Hello Tateo,

    Please check out the datasheet. The minimum duty cycle for the boost and the buck-boost converter is given as typical values. If the duty cycle would need to go below this value, the part starts to skip pulses.

    Best regards,
    Brigitte