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Inquiry regarding sense input on TPS386596L33

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: TPS386000

Hello, all

Now we have one inquiry regarding sense input on TPS386596L33 from our customer.

Please refer to the item below, and feedback us with your comment.

When referring the E2E thread below, we understand that the input capacitor on SENSEn input could help prevent false triggering during transients.

e2e.ti.com/.../793552

Since our stage for using this device is starting first trial, we would like to make sure whether we could prepare for this capacitor in front of resistor dividers or behind of that. (SENSE1 input has internal resistor dividers, so it makes us confused whether we really could place the capacitor at the SENSEn input to ground.)

We thank you in advance for your information.

Best regards,

  • 0
    TI__Expert 8905 points
    Hi Atsushi,

    You should use a 1nF capacitor at the sense1 pin if you are expecting fast transients on the sense1 line - if you input to the sense 1 line is not expected to have fast transients you are fine to not use the capacitor (just make sure that the transient immunity built into the device is sufficient as per the figures near the end of the datasheet).

    Regards,
    David
  • 0 in reply to David Hopkins
    Genius 4015 points

    David-san,

    Thank you for your reply.

    Please let us clarify about the case of other SENSE input (SENSE2 to SENSE4), whether we could add 1nF in front of each resistor dividers of these pins if necessary.

    We thank you once again for your information.

    Best regards,

  • 0 in reply to Atsushi Okui
    TI__Expert 8905 points
    Hi Atsushi,

    For these sense input I would put the capacitor in the resistor network, in parallel with the lower resistor from SENSE to GND. If you feel that you will have a supply with a lot of glitches on it (such as a poorly regulated switcher), you might want to look at the TPS386000 which does not have integrated resistors on the SENSE1 line, allowing you to put the capacitor in the resistor network.

    Regards,
    David