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UCC28C43: VRef and error amplifier reference

Pavel Studnicka
Prodigy 50 points

Part Number: UCC28C43

Hallo,

the UCC28C43 datasheet shows the 2.5V reference is derived from voltage reference VRef 5.0 V.

Could you specify the ratio (2.5 V reference)/ (voltage reference VREF) for whole temperature range?

Is the 2.5V reference created by resistor divider, i.e. is it proportional to VRef ? What is its temperature coefficient?

Thanks a lot.

Regards

                Pavel

  • 0
    TI__Genius 13660 points

    Hi Pavel,

    The reference voltage 2.5V is divided down internally from 5V REF.

    The accuracy of The reference 2.5V is ±1% at room temperature and ±2% over the full temperature range.

    The temperature coefficient is shown in below picture.

  • 0
    Prodigy 50 points

    Hi,

    thanks for your answer. It is clear and it is possible to find it in the datasheet, but unfortunately it is not exactly what we need to know for our design.

    Your answer and the datasheet show absolute error of the both references. We need to know what is relative error between 5V  and 2.5 V reference, i.e. what accuracy and temp coefficient has the 2.5 V divider.

    Thanks a lot.

    Regards

                               Pavel

  • 0 in reply to Teng Feng
    Prodigy 50 points

    Hallo,

    I would like to ask about my question, see below.
    I sent it 7 days ago and I havent yet received any reaction.

    Regards

    Pavel Studnicka

  • 0 in reply to Pavel Studnicka
    TI__Genius 13660 points

    Hi Pavel,

    Sorry for the delay.  we don't have the divider ratio graph vs Temperature.  But you can try to derived it roughly from the graph 5V REF vs Temperature and the graph 2.5V REF vs Temperature.  Thanks.——Teng