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UCC28950: UCC3895/UCC28950 error amp slew rate question

Ray Chang
Intellectual 1345 points
Part Number: UCC28950
Other Parts Discussed in Thread: UCC3895,

Hi, Team

My customer would like to check below questions.

For the UCC3895 error amplifier spec. What does Error Amp slew rate means? What kind of parameter will be limited by this parameters?

For the UCC28950 that datasheet doesn't define it. Does it means no limitation when the EA out has fast △V transient?

  • 0
    TI__Mastermind 25570 points
    Hello Ray

    I will have to check with the designers of the part - this could take a few days.

    Regards
    Colin
  • 0 in reply to Colin Gillmor
    TI__Mastermind 25570 points
    Hello Ray

    The error amplifier slew rate is the speed at which it can change its output voltage. This rate is 2.2V per us on the UCC3895. It is related to bandwidth so a device with a higher unity gain bandwidth could normally be expected to have a higher slew rate than one with a lower unity gain bandwidth.

    In reality a power supply control loop will be closed at a frequency much lower than the unity gain bandwidth - 10kHz is typical and at these low frequencies the ability of the error amplifier to change its output voltage will not be limited by the slew rate. This is the reason why the slew rate is not given in the UCC28950 data sheet.

    I hope this answers your question - if not then please let me know.

    Regards
    Colin