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Info on COT and current valley control

DAVID PETER1
Prodigy 170 points

I am looking for a good reference on Constant On-Time control and current valley control. I have found bits and pieces, but I'm guessing there is an application note or article that does a good job of explaining these. Any suggestions would be appreciated.

    Thanks

         Dave P

  • 0
    TI__Guru**** 191445 points

    I am not aware of anything specific.  On time control is specific to individual IC families.  True "constant on time" has fixed on time with hysteretic off time.  Other control types such as DCAP2 uses "adaptive on time" where  the ontime is variable based on VIN and VOUT.  The internal implementation is proprietary and I do not think we will providing much detail on it.  Valley current detect is pretty striaght forward.  Rather than terminate the on time when a peak current is reached (as you would for current mode control), valley current limit maintains the off time until the switch current falls below the current limit threshold.  This is typical for COT and DCAP type control schemes.  

  • 0 in reply to JohnTucker
    Prodigy 170 points

    Thanks John, that helps.

         Dave P