• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 222 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.

lm3478

Akanksha Nalawade
Prodigy 30 points

our Vin=3.5v and Vout=5V. by following formula,

RSEN <(2 x VSL x fS x L)/(Vo - (2 x VIN)), right hand side will be negative,then what should be Rsense and is external solpe compensation necessary?

  • 0
    TI__Expert 6245 points
    Hello Akanksha.

    External slope compensation is not necessary.

    The kind of instability checked by this equation only applies to systems in which duty factor is greater than 50%. Systems with less than 50% duty do not become unstable due to the current mode loop alone being unstable. If the value for RSEN from this equation is negative than Vout < 2 * VIN which means that duty factor less than 50%. You can use resistor values calculated using equations 16 through 19 in the datasheet. The datasheet is not very clear about applying equation 21.

    Regards, Robert