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DRV401: Please review the schematic of DRV401

Chase Jeong
Mastermind 7810 points
Part Number: DRV401


Dear TI experts,

My customer made a sample PCB using DRV401 but it does not work properly.

Could you review the schematic first?

image.png

Customer applied 5V to VCC.

They expected 2.5V for ICOMP1 and ICOMP2, but they measured 0V for ICMOP1 and 5V for ICOMP2.

Also 5V is measured for REFIN pin.

Is it right operation?

Please let me know if they should fix the schematic for right operation.

Best regards,

Chase

  • 0
    TI__Genius 17560 points

    Hello Chase, 

    Thank you for your post. 

    I do have a couple of recommendations and questions: 

    • Apply 2.5V to REFIN as this will set the common mode output voltage for the differential amplifier output. 
    • Can you provide the PN for A1-A4?
    • What is the purpose of these parallel paths for ICOMP2
    • What is the total resistance when measured from IN1 to IN2? 
    • What is the total resistance when measured from ICOMP1 to ICOMP2?

    Best Regards, 

    Joe

  • 0 in reply to Joe Vanacore
    Mastermind 7810 points

    Dear Joe,

    Thank you for your support.

    Actually my customer disassembled the product which can buy anyone in the market market. The product had DRV401 inside.

    And they made their schematic by analyzing the product.

    Anyway I will give you the answer.

    • Can you provide the PN for A1-A4? -> BAV99 (Dual diode)
    • What is the purpose of these parallel paths for ICOMP? -> it is for the protection of overvoltage and overcurrent.
    • What is the total resistance when measured from IN1 to IN2? -> 90 ohm
    • What is the total resistance when measured from ICOMP1 to ICOMP2? -> DCR of coil = 41 ohm

    Finally, can you check any reference schematic and payout for my customer? I cannot find anything on TI.com.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Genius 17560 points

    Hello Chase, 

    Thank you for your patience with me catching up on this. 

    I would say the best starting point would be the layout and schematic shown in ±100 A Closed-Loop Current Sensor Reference Design. 

    This will be a good starting point and then we can tweak values accordingly. 

    I hope this helps, 

    Joe