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DAC161S997 ideal DC-DC switching frequency

Robbie Beehler
Prodigy 135 points
Other Parts Discussed in Thread: DAC161S997

Hi all,

I am designing a 4-20mA transmitter using the DAC161S997 DAC.  It will be a loop powered design, but due to the current requirements of the auxiliary circuitry, I will need a DC-DC switching power supply.  All of the application notes that I have seen with the DAC161S997 use an LDO for the voltage supply.  Does anybody have experience designing a switching power supply with the DAC161S997 to know what the "ideal" switching frequency is?  In my mind, an ideal frequency would be one that would allow the DAC161S997 to compensate for the switching currents of the supply, to minimize the current ripple that would be injected onto the loop.

Thanks!

Robbie

  • 0
    TI__Genius 16890 points
    Hello Robbie,

    That shouldn't be a problem using a switcher instead of the LDO. The bandwidth of the circuitry driving the loop is not very high. Use good layout techniques and make sure the output of the switcher output has good bypassing and it should be ok.

    Mike