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INA281-Q1: INA281B4 BUCK INDUCTOR CURRENT MEASUREMENT APPLICATION

Don Cutler
Prodigy 30 points
Part Number: INA281-Q1
Other Parts Discussed in Thread: INA281

Hi, Could you please help me with an application of the INA281B4? I'm using it in a high side buck convertor current sensing application and it doesn't seem to like the common mode range even though it is only 20V. I have a schematic and simulation waveforms I can send.

  • 0
    TI__Mastermind 26475 points

    Hello Don,

    Please send what you can share.  I will mention common things often overlooked and referenced in the datasheet.

    Is there a large common transient?(See figure 2)  Also are you aware that the bandwidth of the INA281 is limited by the input voltage. (See figure 27).  Is there a negative Vsense transient. (see section 8.2.2.1)