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UC2625-EP: UC2625-EP General Questions, 2nd attempt to post

David Kusnerak
Prodigy 90 points
Part Number: UC2625-EP

UC2625-EP

1) Would like to verify, the RC Oscillator 1-2 cycle dead time is only applied at HALL SENSORS transitions

2) Configured for four quadrant PWM , voltage control scheme, EA unity configured, EA+ control voltage with current sense PWM termination (Isense tied to PWM IN)

2-1) If current sense does not terminate PWM cycle what is the maximum duty cycle?

2-2) Is there any dead time between PWM cycles

3) Response time of internal fault over-current comparator to disable bottom side drivers?

  • 0
    TI__Mastermind 24975 points
    Hey David,

    1) To be clear about the RC Oscillator dead time is that the RC oscillator dead time is to prevent the outputs being on at the same time. To quote the datasheet:
    " It is also impossible for one of these drivers to turn on without the other driver having been off for at least two PWM oscillator clocks."
    It would be more correct to say it only happens and output transitions.
    2) I would expect "100%" duty cycle with some dead time, however the dead time nor max duty cycle are specified so I don't have values for what it would be for you.
    3) This is also not specified thus I don't have a number for you.

    Thanks,
    Daniel
  • 0 in reply to Daniel Hartung
    Prodigy 90 points

    Would like to re-address Item #1

    The wording in the data sheet make this point unclear to me.

    Q1) For any HALL SENSOR change of state a 1-2 oscillator clock period dead time is applied to all PHASE outputs.

  • 0 in reply to David Kusnerak
    TI__Mastermind 24975 points
    Hey David,

    If the HALL SENSOR change would cause a change in the PHASE outputs, this would cause the 1-2 oscillator clock period dead time.

    Thanks,
    Daniel