• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 79 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS1HB08-Q1: PWM EN

Jiawei Hu1
Expert 4575 points
Part Number: TPS1HB08-Q1

Hi team,

For TPS1HB08-Q1, can we use 10KHz PWM to EN TPS1HB08-Q1? If not, what frequency PWM can we support? Thanks!

BR

Jiawei

  • 0
    TI__Mastermind 32650 points

    Hi Jiawei,

    The max PWM for this device is 2kHz but the duty cycles that are supportable is limited.

    We usually recommend a 1kHz frequency to have more flexibility with duty.

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    TI__Expert 4575 points

    Hi Shreyas,

    Thanks for your reply! Could you kindly what cause the PWM frequency limitation?

    Shreyas Dmello said:
    The max PWM for this device is 2kHz but the duty cycles that are supportable is limited.

    For 2kHz, what duty cycle can support? Thanks!

    BR

    Jiawei

  • 0 in reply to Jiawei Hu1
    TI__Mastermind 32650 points

    Hi Jiawei,

    A 2KHz frequency results in a time period of 500us. On the datasheet we mention a maximum on delay time of 100us and an off delay time of 100us. The ramp rate is also mentioned but depending on the load the rise time and fall time can take a while as well. It is difficult to give an exact value since the load will determine timing as well.

    Therefore, the PWM at these rates is on the border of supportability and duties around 50% are supportable. Any other duties can run the rise of incomplete turn on or turn off. Please note that the PWM here will also look like a trapezoid wave and will be significantly different from the expected square wave output which can have an effect on the duty calculations and average value.

    Our devices are meant for DC applications and some low frequency PWM applications. While 2kHz may be supportable, the effective use case is severely limited.

    Thanks,

    Shreyas