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TPS386000-Q1: Noise filter

Part Number: TPS386000-Q1

Hi team,

Even if adding an RC filter as a noise filter to 6 pin (SENSE 4 H), 7 pin (SENSE 4 L), will it be a problem as IC operation?

For accuracy such as error of voltage drop, the influence is considered.

I want to know if there is no problem as operation.

Best regards,

Tomoaki Yoshida

  • Hi Tomoaki,

    the idea is to add a cap to the sense inputs, not an RC-filter. The added cap together with sense resistors forms a RC-filter.

    See figure 31 of datasheet: Add a 1...10nF cap from each sense input to GND.

    Kai
  • Tomoaki,

    The RC filter will not be an issue for device operation but the RC filter will have 2 effects:

    1. The voltage thresholds (V_IT+ and V_IT-) will be slightly shifted

    2. The /RESET delay could also be shifted due to the additional delay of the RC filter at the SENSE input.

    I recommend only using capacitor in parallel with the bottom SENSE resistor (from SENSE pin to GND) if you don't want to voltage thresholds or delay to shift. Remember the delay can be set with capacitors at the CT pins so no need to use resistors at the SENSE pins other than the resistor divider to set the voltage threshold. But no damage will result with RC filter at the SENSE inputs.

    -Michael

  • Hi Michael-san,

    Thank you for your support.
    I will use capacitor in parallel with the bottom SENSE resistor as you said.
    For SENSE4H and SENSE4L, can I insert capacitors from SENSE terminals to GND with the same way of thinking?

    Best regards,
    Tomoaki Yoshida
  • Hi Tomoaki,

    yes, always from the respective sense input to GND.

    Kai
  • Tomoaki,

    Yes use capacitors from Sense input to GND and as close to the pin as possible for the best noise filtering.

    -Michael