• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 321 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.

TPS62205: TPS62205 PFM Mode

Yang Wu
Expert 3030 points
Part Number: TPS62205

Hi Team,

I get a question about TPS62205's PFM mode. 

Datasheet page 9 says [Two conditions allow the converter to enter the power save mode operation]. one is DCM and another is peak detection.

Does both conditions(DCM & peak) need to be satisfied then controller goes to PFM? or either DCM or peak can allow it go to PFM? 

thanks a lot.

Best regards,

Yang

  • 0
    TI__Expert 3030 points

    Hi Team,

    + 1 more question:

    Datasheet says [The N-channel rectifier is turned on and the inductor current ramps down. As the inductor current approaches

    zero, the N-channel rectifier is turned off and the P-channel switch is turned on again, starting the next pulse.] in page 10. 

    Does it means that the switching frequency varies and converter works in Boundary conduction mode when it's in power save mode? It looks like a constant on time operation for a fixed Vin &  Vout. 

    thanks a lot.

    Best regards,

    Yang

  • 0 in reply to Yang Wu
    TI__Expert 3645 points

    Hello,

    to enter in PFM is sufficient one of the two conditions. About your first question yes, the device is in BCM and the freq. is varying and the ton is defined by the peak current. 

  • 0 in reply to Alfonso Furio
    TI__Expert 3030 points

    Hi Alfonso,

    Thanks for your help. 

    Best regards,

    Yang