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TLC7524: REF & RFB pin details

KV
Prodigy 55 points
Part Number: TLC7524

Hi

I'm Venky, 

im using TLC7524, i want to vary output volatge is (0V ~ 5V), what i have to do for REF & RFB pins, please help me for this design.

  • 0
    TI__Mastermind 19086 points

    Hi,

    Connect -5V to REF pi o the device driven from a low impedance source.

    RFB should connect as follows. ( Basically its a current output DAC and you have to use an op amp to convert this to voltage).

    Output voltage will be -Vref * ( Code/256). If you don't have -5V as reference, feed 5V as reference and add one more op amp to the output of the below circuit in inverting configuration.

    Note Ra is not required in this design.

    Regards,

    AK

  • 0
    TI__Mastermind 19086 points

    Hi,

    Connect -5V to REF pi o the device driven from a low impedance source.

    RFB should connect as follows. ( Basically its a current output DAC and you have to use an op amp to convert this to voltage).

    Output voltage will be -Vref * ( Code/256). If you don't have -5V as reference, feed 5V as reference and add one more op amp to the output of the below circuit in inverting configuration.

    Note Ra is not required in this design.

    Regards,

    AK