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  1. #1
    Beginner Beginner LiangXiao is on a distinguished road
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    [SOLVED] TLE9879QXA40 VSD overvoltage

    I use the TLE9879QXA40 to drive my 24V motor,but it does not work.
    I got the message that VSD_UPTH_STS=1(drive_supply_voltage_too_high=overv oltage on VSD pin detected)
    then all GHx are in high voltage,GLx have no voltage.
    that is why,and how to deal with it?

  2. #2
    Beginner Beginner LiangXiao is on a distinguished road
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    I know the reason. Because my power supply is 24V, it need to set new monitor upper threshold of VSD in ADC2.

  3. #3
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    Fiz is on a distinguished road
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    Hi Ling Xiao,

    exactly, if you want use 24V supply voltage you will need to reconfigure the bits:

    ADC2->TH0_3_UPPER.CH2 (VSD overvoltage threshold)
    ADC2->TH0_3_UPPER.CH1 (VS overvoltage threshold)
    MF->VMON_SEN_CTRL.VMON_SEN_SEL_INRANGE (attenuator factor for VDH monitoring)

    The equations for the desired thresholds can be found in the TLE987x User Manual under equation 22.1 and 22.2.

    But since VDH is monitored by ADC1 the reference voltage for the calculation of VLSB is VAREF not VBG and the data width also needs to be adapted accordingly. ( 8 or 10 Bit width)

    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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