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Original question:

TPS54560: TPS54560DDAR

TPS54560: TPS54560DDAR with external system clock

Howard Belk
Prodigy 10 points
Part Number: TPS54560

I am using an LTC6900 running at 485kHz as system clock - this is a low impedance (100 ohm) output going from 0V to 3V3.Reading section 7.3.11 of the datasheet and referring to fig 25 (LH part). I am confused whether the series or shunt resistor is supposed to be 50R and what the other resistor should be. I see the parallel cap should be 10pF. Can anyone clarify please?

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    TI__Genius 11040 points

    Hello,

    In the image below I circled the capacitor which should be 50Ohm.  The RT resistor should be set for your default switching frequency as the 50-Ohm resistor will be negligible. Also, as you mentioned the capacitor should be 10pF.

    Please let me know if anything remains unclear.

    Best Regards,

    Katelyn