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UCC28950: ADEL, TMIN

kwangwoon Lee
Prodigy 230 points
Part Number: UCC28950

Hi,

I would like to ask you how to set the ADEL, ADELEF for UCC28950 devices.

Some circuits seem to be used by connecting with a resistor divider between Vref and GND, 

and some circuits seem to be used by connecting with a resistor divider between CS and GND.

Is there a difference in the behavior in each case?

And the secondary side is composed of current doubler rectifier.

At this point, are there any other considerations in the behavior of OUTE and OUTF than when 

applied to the centapped method?

Best Regards.

KwangWoon.

  • 0
    TI__Genius 9790 points

    Hi, KwangWoon

    CS waveform is kind of triangle waveform,  if you use ADEL/ADELEF by connecting with a resistor divider between CS and GND. the average voltage of CS pin defines the ratio of real deadtime of OUTA/B over deadtime base(which is defined by RDELAB), Also defines he ratio of real deadtime of OUTC/D over deadtime base(which is defined by RDELCD). This is the function of adaptive delays.

    But the peak voltage on CS pin would be 2V since cycle by cycle current limitation is 2V. If you wish to program shorter delays than those available through the adaptive delays as described in the data sheet you can tie ADEL and ADELEF to a DC voltage (can be VREF) which is higher than that at the CS pin.

    With current doubler rectifier, if you don't need SR, can leave OUTE/OUTF open.

    Yunsheng