• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 546 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.

LM5020 Block Diagram

NY
Expert 3040 points

HI, I would like to know the reason that sawtooth wave from OSC is connected to non-inverting input of internal CS comperator.

 

 

 

 

  • 0
    TI__Genius 9130 points

    This is for slope compensation. This is explained in the datasheet at the bottom of page 8.

    A current ramp is generated by the osc sawtooth, and this current ramp is injected into the CS pin. Depending on the user-chosen value of the external resistor in series with the CS pin, the size of the slope compensation voltage ramp can be adjusted.

    Slope compensation is required by current mode controllers for stability against sub-harmonic oscillation when the duty cycle is above 50%.

     

    Regards,

    Bernard

  • 0 in reply to Bernard Keogh
    TI__Expert 3040 points

    HI, Bernard san

    Thank you very much your comment! now I understand.