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UCC28950: UCC28950/UCC28951

Christian Oberwallner1
Prodigy 20 points
Part Number: UCC28950

Hello,

how can I achieve a fixed delay time programming between OUTA/OUTB and OUTC/OUTD?

I kow this is done by resistors at DELAB and DELCD. But in some applications ADEL is connected to a resistor devider from VREF to GND, and in other applications ADEL is connected to GND via a 0 ohm resistor.

What is the difference of this two alternatives?

Best regards

Christian O.

  • 0
    TI__Expert 7395 points

    Christian,

    Thanks for your interest in TI here. I will be happy to route your request into the appropriate team to support. Please note the team that supports this device is in the US so they will have a delayed response due to the US holiday. Please expect a response by end of day Tuesday next week US time at the latest. Have a great weekend!

    Regards,

    John

  • 0
    TI__Genius 9790 points

    Christian,

    The voltage on ADEL pin is another element to define delay time between OUTA/OUTB and OUTC/OUTD as along as resistance on DELAB/DELCD.

    Based on equation 3/4 in datasheet of UCC28950, the higher voltage of ADEL, the shorter delay time between OUTA/OUTB and OUTC/OUTD with the same resistance on DELAB/DELCD.

    So both of  ADEL is connected to a resistor divider from VREF to GND and ADEL is connected to GND via a 0 ohm resistor can achieve fix delay time between OUTA/OUTB and OUTC/OUTD. But the minimum resistor on DELAB/DELCD pin is limited at 13kohm,if you need shorter delay time than the delay time defined by 13kohm, you need to connected to a resistor divider from VREF to GND, otherwise connect ADEL pin to GND via a 0 ohm is good enough.

    BR.

    Yunsheng