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INA190: Transient Protection

Noriyuki Takahashi
Genius 10110 points
Part Number: INA190

Hi team,

There is a description as below in the datasheet, but a single transzorb is connected between IN- and GND, not between the device inputs. Which is correct, connecting a single transzorb between IN- and GND or the device inputs?

"The most package-efficient solution involves using a single transzorb and back-to-back diodes between the device inputs, as shown in Figure 43."

Could you also clarify questions of the attached?ina190.pptx

Regards,

Noriyuki Takahashi

  • +1
    TI__Mastermind 31275 points

    Hey Noriyuki,

    The statement and figure from datasheet are correct. However, it could be more clear that the single transzorb is only at the one of the input pins, while the back-to-back diodes connect the device inputs.

    1. The tranzorb shown in Figure 43 is a bidirectional transzorb (TVS diode). It could be a unidirectional as well. An example is SMDJ30A.

    2.  Here is an example of back-to-back diode package (reverse series pair): SMS7621-006LF

    3. The Rprotect resistors should be on the left (load side) of the diode in order to actually limit current into diode. If a filter capacitor is used (and it should to help stabilize input differential sense voltage), then this capacitor should be placed as close as possible to device input pins (right side of diodes).

    Sincerely,

    Peter