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Thread: Bridge Drive Issue

  1. #1
    New Member New Member PeterShi is on a distinguished road
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    Bridge Drive Issue

    I run the board without load. PWM will stop due to over current.
    Could the over current protection been disabled?
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  2. #2
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    pestadieu is on a distinguished road
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    Dear Peter Shi,

    The overcurrent protection cannot be disabled.

    However, the PWM is supposed to work without load. Try to increase the DS monitoring threshold, filter time and blanking time.
    Last edited by pestadieu; May 14th, 2019 at 03:55 AM.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    New Member New Member PeterShi is on a distinguished road
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    Hi Sir, I used the same software on different HW boards.
    Only some boards are OK. Why this MCU(TL9879) has these difference?
    Below thresholds should be OK for no load.

    DS monitoring threshold: 0.75V
    filter time: 2us
    blanking time: 2us

  4. #4
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    Fiz is on a distinguished road
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    Hi Peter,

    Which boards were you using?
    Over current can also be caused when the active and free-wheeling MOSFET are turned on at the same time.
    Try increasing the charge and discharge current of the bridge driver or increasing the cross-current-protection time.
    Best,
    Fiz
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  5. #5
    New Member New Member PeterShi is on a distinguished road
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    Fiz,
    How much charger and discharge current do you recommend?
    Could I use the max charge and discharge current?
    When I try to increase the cross-current protection time, the Bridge damaged.
    Why your company support is very slow?

    Regards

  6. #6

    Infineon Employee
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    Lykaon is on a distinguished road
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    Hello PeterShi,
    sorry the delay after your second post. We are working on your topic. In any cases you can contact our technical assistance center https://www.infineon.com/cms/en/about-infineon/company/contacts/product-support-form/?redirId=56193

    Best regards
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  7. #7
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    Fiz is on a distinguished road
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    Hi PeterShi,

    Since you are using the TLE9879 Evalkit with the IPD90N04S4-05 you could use a charge/discharge current of at least 40mA to get fast switching.
    You could use the max currents, but this will lead to high electromagnetic emissions and ringing both at the gate and source.
    What did you experience when you increased the cross-current protection time?

    Best,
    Fiz
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  8. #8
    New Member New Member PeterShi is on a distinguished road
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    Fiz,

    Thanks for your quick support. I have recevied relya from your technical assistance center.

  9. #9
    Moderator
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    Fiz is on a distinguished road
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    Hi PeterShi,

    were you able to solve your problem?

    Best,
    Fiz
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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