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INA301: pin:pin replacement/ lower speeds

Lucas Pucheta
Intellectual 300 points
Part Number: INA301
Other Parts Discussed in Thread: INA200, INA303, INA302, INA381

The only chip I am going to look for soon is a replacement for the INA301.

 

That chip works for us in a new design, except that it reacts too quickly. For some loads, we would like the !ALERT to respond a little slower, to let transients through.

 

Ideally there is some pin to pin compatible drop in replacement that is just slower. If not I need to redesign the board.

 

I can’t remember the chip, but I did try one a few months ago in the same family that had the LIMIT input an adjustable trip point or it was feedback into the comparator. It was also slower I think. The problem was it had an ALERT output instead of !ALERT, so it didn’t work at all.

  • 0
    TI__Mastermind 26660 points

    Hello Lucas,

    You could try putting an input filter on the INA301 to filter out transients. The only similar product with the same 8-pin VSSOP package is the INA200, but it is not the same pin out.

    Other similar devices that would allow you to adjust the step response delay time are the INA302/INA303 and the INA381.

    Sincerely,

    Peter

  • 0 in reply to Peter Iliya
    Intellectual 300 points

    This is for a motor controller. So large inductive loads will be controlled.

     

    Yes, we have a filter on the inputs. We have tried series 10-ohm resistors with various caps. I think the datasheet said not to go over 10 ohms or the resolution suffers. I think we went to 100 ohms and 10uF, but I am not sure. It has been several strange months since we looked at it.

     

    We tried an INA200, modifying the pin 3 from a LIMIT input to a CMPin input. The plan was to have another filter on CMPin, slowing things down, but we never got that far.

    However, that was inverted. The CMPout was low when the current was low and high when the current was too high. Since low disables the output in our circuitry, this never did anything.

  • 0 in reply to Peter Iliya
    Intellectual 300 points

    This is for a motor controller. So large inductive loads will be controlled.

     

    Yes, we have a filter on the inputs. We have tried series 10-ohm resistors with various caps. I think the datasheet said not to go over 10 ohms or the resolution suffers. I think we went to 100 ohms and 10uF, but I am not sure. It has been several strange months since we looked at it.

     

    We tried an INA200, modifying the pin 3 from a LIMIT input to a CMPin input. The plan was to have another filter on CMPin, slowing things down, but we never got that far.

    However, that was inverted. The CMPout was low when the current was low and high when the current was too high. Since low disables the output in our circuitry, this never did anything.