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Thread: Bridge Drive Issue

  1. #1
    Beginner Beginner 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
    Intermediate Intermediate
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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
    Beginner Beginner 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

    Infineon Employee
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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.

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