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DRV8806: device recommendation and questions about DRV8806

Frank Xiao
Genius 12055 points
Part Number: DRV8806
Other Parts Discussed in Thread: DRV8904-Q1, DRV8906-Q1, DRV8908-Q1, DRV8860, DRV8706-Q1

HI team,

My customer is looking for Inductive Load driver solution.

1)The constant current requirement is 1.5A, transient peak current requirement is 3.5A.

2)better 16 channels

3)open circuit detection 

4)short to gnd detection

I have found the DRV8806 with 2 channels in parallel to achieve the function. Do you have some suggestions?

If we configure the two channels in parallel, whether it's ok? Do we need to do additional design to achieve it(our concerns are the two channel will not on/off at the same time---channel to channel delay   and  the current sharing of the device).

Thanks.

  • 0
    TI__Mastermind 37683 points

    Hi Frank,

    Thank you for posting to the motor drivers forum.

    Let me research this a bit more and I will get back to you by 12/02 US early morning time.

  • 0 in reply to Pablo Armet
    TI__Mastermind 37683 points

    Hi Frank,

    I think the DRV8904-Q1 might be a better option. The DRV8904-Q1 is a quad half-bridge driver with a maximum current rating of 1A-RMS per output. The device supports paralleling of the outputs to drive higher currents. In parallel mode, the device will synchronize the paralleled outputs to prevent any delay. This device also has integrated open load detection (OLD) and overcurrent protection (OCP). 

    Please take a look at the DRV8904-Q1 datasheet to learn more about the part and to determine if it's a good fit for the customer's application.

  • 0 in reply to Pablo Armet
    TI__Genius 12055 points

    Hi Pablo,

    Thanks for your reply. Why we promote 4 channel solution not 6 channel. Whether it's because the thermal and total current capability?

    The customer external Inductive load Pull up voltage isn't the same as the board VM, They are separate, how to deal with the requirement？

    Thanks.

  • 0 in reply to Frank Xiao
    TI__Genius 12055 points

    Hi Pablo,

    i have double check the peak current information, the 3.5A peak time may be several ms, even to 1 second. So the DRV8904 current isn't enough even with parallel(2.6A). Do we have other solutions? Whether the DRV8806 is ok? Thanks.

  • 0 in reply to Frank Xiao
    TI__Mastermind 37683 points

    Hi Frank,

    If you require higher current, you can select the DRV8906-Q1 or DRV8908-Q1 which has 6 and 8 total half-bridge channels respectively. Paralleling 3 channels can get you to 3.5-A peak. Also, if you require even higher current, this family of half-bridge drivers can go up to 12 channels with maximum of 6-A peak current with paralleled outputs.

    Let me know if this works. You can get a DRV8908-Q1 evaluation board for testing and evaluation. 

  • 0 in reply to Pablo Armet
    TI__Genius 12055 points

    Hi Pablo,

    Thanks for your help. Currently the customer wants to use DRV8904 4 channels in parallel to achieve the current requirement. Whether it's ok?

    We also want to double check the SPI connection, as you know our DRV8860 can only support daisy chain SPI connection. Whether the DRV8906/04 can support the with or without daisy chain connection？ Thanks.

  • 0 in reply to Frank Xiao
    TI__Mastermind 37683 points

    Hi Frank,

    I should have asked this sooner but what is the customer's application? The DRV8904 is an automotive rated device and is mainly targeted for automotive applications but can still be used in industrial applications. I would like to confirm the intended customer's application to determine if the DRV8904 is okay to use.

    The DRV8904 and the other DRV89xx devices in this family support daisy chain connection so you can control multiple devices with a single SPI bus.

  • 0 in reply to Pablo Armet
    TI__Genius 12055 points

    Hi Pablo,

    The application is DCS. Thanks.

  • 0 in reply to Frank Xiao
    TI__Mastermind 37683 points

    Hi Frank,

    I am not that familiar with DCS applications. I have asked the marketing team to confirm  if my recommendation is a good fit for this application or if another device will fit better.

    Based on the current requirements and the protection features the customer needs, the DRV8704-Q1 or DRV8706-Q1 seems like a good fit. But like I said, please let me double check with the marketing team.

    I will reply to this thread by 12/09 with a final recommendation for the customer.

  • 0 in reply to Pablo Armet
    TI__Mastermind 37683 points

    Hi Frank,

    I have another question that I forgot to ask you before. Is the customer planning on PWMing the outputs? If so at what frequency? The DRV8904-Q1 and the rest of the DRV89xx-Q1 devices have internal PWM generators with the option of 80-Hz, 100-Hz, 200-Hz and 2-kHz. If another specific frequency is required, then another device might be more suitable for them. However, if they plan to drive the outputs continously (100% duty cycle), then the device will work for them.

  • 0 in reply to Pablo Armet
    TI__Mastermind 37683 points

    Hi Frank,

    One more thing I forgot to mention in my previous reply. How many inductive load are they planning on driving?