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  • TI Thinks Resolved

LMV358-N-Q1: LMV358Q1MAXNOPB

Prodigy 195 points

Replies: 6

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Part Number: LMV358-N-Q1

Dear Team,

We are looking into the below part - LMV358Q1MAXNOPB

Can this part handle +/-5V dual power supply?

Is LMV358Q1 and LMV358NQ1 same? unable to identify datasheet of LMV358Q1

Kindly support.

Regards,

Mohana Krishnan M

<removed email address>

  • Hello Mohana,

    Welcome to the e2e forums. I hope you will find the forums helpful.  The LMV358 will not survive a 10V supply or +/-5V which are effectively the same. The LMV358 and LMV358-N have similar but different designs. What was the full part number for the LMV358Q1?

    This link should list all automotive rated dual op amps that have 10V or greater maximum supply voltage

    http://www.ti.com/amplifier-circuit/op-amps/products.html#p480=2;2&p1261max=10;180&p1498=Automotive&sort=p1130;asc

    What are the key op amp parameters needed for this application?

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Full Part number - LMV358Q1MAXNOPB

    It should be dual channel.

    Application is for measuring Phase voltage in VFD. So, it must be capable of handling the switching frequency (10kHz), so that the waveform does not get distorted at output.

  • In reply to Mohana Krishnan M:

    Mohana,

    LMV358Q1MAXNOPB is a LMV358-N device, there is no public LMV358QDRG4Q1 device that is based on LMV358(no N)

    I suggest looking at TL3472-Q1, TL972-Q1, or RC4580-Q1

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Mohana,

    If you need more help just post a new reply and I'll support you further.

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Dear Ron,

    Yes we would need your support.

    I have simulated our requirement using TINA TI.

    Worst case frequency = 20kHz.

    Considered duty ratio = 50% (Worst case can go upto 1%)

    The output waveform is getting distorted.

    We would like to get clarified on the below points,

    • Would the front and back end Opamp support for this frequency? Kindly suggest one suitable device for the same.
    • Would the isolation amplifier (AMC1311BDWVQ1) support for this frequency. Because i could see that rise time is mentioned to be 1us.OPVSENSE_COMPLETE.TSC

  • In reply to Mohana Krishnan M:

    Mohana,

    The biggest issue was that op amp U2 had the power supply connected backwards. It took me over 10 minutes find that one. 

    The second issue is that the input common mode rejection is poor because the input difference amplifier wasn't balanced. I changed R2 from 100k to 76k to fix that. The Vbias voltage has a 24k ohms impedance.

    OPVSENSE_COMPLETE(2).TSC

    The TL3472-Q1TL972-Q1, and RC4580-Q1 are not rail to rail output so 0V to 5V output won't be possible. The TL3472 model limits output from +1V to 4V

    The actual TL3472 output low voltage is more complex than that simple assumption.

    To get a rail to rail output, there is slower TLV272-Q1 and faster TLV2172-Q1

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

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