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DRV110: Issues related to hold current accuracy

Annie Liu
Genius 10295 points
Part Number: DRV110
Other Parts Discussed in Thread: TINA-TI

Hi Team,

Hello, according to the specification of the chip, under the condition that the PEAK and HOLD pins are directly connected to GND and RSENSE = 1 ohm, the lower limit of the current deviation is 20%, the upper limit is 30%, and the excitation current is 10%. Please confirm whether the accuracy range of the excitation and holding current that can be set by the chip can be higher.

Regards,

Annie

  • 0
    TI__Genius 17998 points

    Hey Annie, 

    These specs hold true across the full range of device operating voltages and temperatures and accounting for device-to-device variation.  You'll probably find that for a smaller set of operating conditions that this accuracy is much improved, though it might be offset from the Typical value.  For example, maybe for 25°C and 24V it will be 52mA ±5%.  (Just some random numbers I made up).  I highly recommend performing your own tests if better accuracy is needed.

    Just curious, what is the load you are driving?  Wondering if a newer motor driver or Contactor Driver would fit your application better.

    Best,

    Jacob

  • 0 in reply to Jacob Thompson
    TI__Genius 10295 points

    Hi Jacob,

    Our load is two coils with winding resistance of 7Ω, the two coils are in series, and the current flowing through the coils is controlled by controlling MOSFET.

    The input voltage is 110V DC, and the Ipeak needs to be limited to 13A, and the Ihold is set to 1.5A.

    I wonder what level of accuracy the excitation current and holding current can reach in this case.

    Regards,

    Annie

  • 0 in reply to Annie Liu
    TI__Genius 17998 points

    Hey Annie,

    Ahh okay, I see.  

    Annie Liu said:

    The input voltage is 110V DC, and the Ipeak needs to be limited to 13A, and the Ihold is set to 1.5A.

    I wonder what level of accuracy the excitation current and holding current can reach in this case.

    Have you tried to simulate it with one of the simulations provided on the product page?  https://www.ti.com/product/DRV110#design-development If that doesn't work, then the best way to determine it is just to test it out yourself. You can use https://www.ti.com/tool/DRV110EVM to speed along development.  I don't have any data beyond what is shown in the datasheet so I don't have a way to get a better accuracy spec than the datasheet provides.  

    Regards,

    Jacob

  • 0 in reply to Jacob Thompson
    Prodigy 10 points

    Hello,

    In the two links you gave above, the downloaded simulation file is shown in the figure, there is no.exe running program file, how should I use it? Also see there are several files, which one should I download?

  • 0 in reply to Qiang Gao
    TI__Genius 17998 points

    Hey Qiang,

    The first two are designed to be used with TINA-TI, you can download it here:  https://www.ti.com/tool/TINA-TI 

    The third is for PSPICE, you can download PSPICE for TI here - https://www.ti.com/tool/PSPICE-FOR-TI 

    Admittedly I am not very familiar with either program unfortunately.  I would start with the TINA-TI as I think those are easier to get running from the start.  However, if you are familiar with LT-SPICE or PSPICE then start with the PSPICE model.  

    Best,

    Jacob