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DRV8262-Q1: DRV8262-Q1

user6542167
Prodigy 30 points
Part Number: DRV8262-Q1
Other Parts Discussed in Thread: DRV8263-Q1, , DRV8262

Tool/software:

Hello,

My question is about the selection of Bulk Capacitor (It has been described in DS. The larger the Bulk Capacitor, the better, the larger the capacitance value, the smaller the VM ripple voltage)

My question is: I want to know what the minimum value of Bulk capacity should be? How to perform quantitative calculations? For example: If the ripple voltage of the VM must be less than 1V, we can easily obtain the minimum value of Bulk capacity through simulation. Or if the power supply ripple current is less than 10% of the maximum current, we can also get the minimum value of Bulk capacity through simulation.

What is the basis for us to choose the minimum value of Bulk capacity? (In my application, VM power supply from 36V~54V, 20KHz PWM, motor current 7.5A)

Thank you in advance.

Best regards,

Xiaoshan Lu

  • 0
    TI__Mastermind 43985 points

    Hi Xiaoshan,

    Thank you for your question. This application note Bulk Capacitor Sizing for DC Motor Drive Applications provides detailed calculations and guidelines for bulk capacitor in BDC motor drives.

    We're also releasing the next generation device of the DRV8262-Q1, which is the DRV8263-Q1 with two options SPI control and HW control (similar to the DRV8262-Q1) with additional features such as load diagnostics and powered off braking.

    Regards, Murugavel  

  • 0 in reply to Murugavel4637
    Prodigy 30 points

    Hi Murugavel,

    Thank you for your quick reply.

    I will make an estimate based on the documents you provided, and ask you if I have any questions.

    In addition, I am very interested in DRV8263-Q1, and I have a few questions:

    1. When was DRV8263-Q1 launched? I haven't found this information in February this year.

    2. DRV8263-Q1 has improved the current driving capability compared to DRV8262-Q1, but what about the cost? Will DRV8263-Q1 be more expensive? What is the approximate percentage?

    3. What is the ASIL level of SPI interface 8263 in FUSA? ASIL-B?

    4. When is DRV8263-Q1 expected to be mass-produced? What is its current status?

    5. Do you recommend DRV8263-Q1 to replace DRV8262-Q1?

    Best regards,

    Xiaoshan 

  • 0 in reply to user6542167
    TI__Mastermind 43985 points

    Hi Xiaoshan,

    user6542167 said:
    I will make an estimate based on the documents you provided, and ask you if I have any questions.

    Sure, thank you.

    user6542167 said:
    1. When was DRV8263-Q1 launched? I haven't found this information in February this year.

    It is a new product currently in "preview" status and sampling. It is not yet released to the market for production use.  The product webpage is https://www.ti.com/product/DRV8263-Q1 and its datasheet is available on the website. EVMs are available to order now. 

    user6542167 said:
    2. DRV8263-Q1 has improved the current driving capability compared to DRV8262-Q1, but what about the cost? Will DRV8263-Q1 be more expensive? What is the approximate percentage?

    The 1 Ku pricing is published on the website. It is competitively priced compared to the DRV8262-Q1 as well as comes in a much smaller footprint and much lower Rdson for the integrated power MOSFETs.

    user6542167 said:
    3. What is the ASIL level of SPI interface 8263 in FUSA? ASIL-B?

    It is FuSa capable similar to the DRV8262-Q1. Also comes in an "S" version, SPI based registers configuration and fault / diagnostics reporting features.

    user6542167 said:
    4. When is DRV8263-Q1 expected to be mass-produced? What is its current status?

    I can find out the expected release time and get back to you.

    user6542167 said:
    5. Do you recommend DRV8263-Q1 to replace DRV8262-Q1?

    We recommend the DRV8263-Q1 for any 48 V automotive BDC motor new designs. The packages are different and because of this footprint is different between these two devices. The DRV8263-Q1 offers more diagnostics features as well as lower Rdson which would be beneficial to drive higher peak currents. 

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 30 points

    Hi Murugavel,

    Hope you are well.

    Thank you for the detailed.

    The PDRV8263S version has better current driving capability and price than DRV8262,  and provides "Spread spectrum" technology, right? This will be beneficial to EMC RE and CE I think.

    The key is when PDRV8263S will be mass-produced available?  This will be critical for us. Please help confirm it. Thank you.

    In addition, I would like to know if you can provide a curve of JA thermal resistance of DRV8263 over continue time(0.1s, 0.2s, 0.3s 0.4s ....1s, 2s,4s...DC). I need to calculate the motor driving current capability in a short time and long time in our application based on this graph.

    It means to provide a graph like "Figure 8-5" in the DRV8262-Q1 datasheet. I want this graph of PDRV8263S.

    The following is a single-channel DRV8262:

    By calculation, we get:

    Thank you in advance.

    Best regards,

    Xiaoshan 

  • 0 in reply to user6542167
    Prodigy 30 points

    Hi Murugavel,

    Sorry, we are currently using DRV8262 as single-channel. in the datasheet, RDS_on(HS+LS)=50mohm, while PDRV8263 is 85mohm. In addition, due to the small package of PDRV8263, its short-time JA thermal resistance is much higher than that of 8262. In this way, the current driving capability of DRV8263 is worse than that of DRV8262 single channel (by calculating the junction temperature, the maximum value of TJ is 150℃, considering the ambient temperature of 85℃).

    Am I right?

    BR

  • 0 in reply to user6542167
    TI__Mastermind 43985 points

    Hi Xiaoshan,

    You are correct. In single channel two H-Bridges in parallel mode the DRV8262 would be lower Rdson. You are correct about the higher RθJA for the DRV8263 package as well. Sorry for overlooking these. The DRV8263 does provide more diagnostics.

    The thermal graph for the DRV8263-Q1 is in works now. We will post it as soon as it is ready. Meanwhile I'm sharing the transient thermal impedance and current data - see below. Thank you.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 30 points

    Hi Murugavel,

    Thank you for sharing this data.

    For now I will continue to use the DRV8262-Q1，and I will continue to pay attention to not only 8263 but also 8163.

    In addition, I would like to say that the relationship between temperature and RDS_on is also very important, just like the following figure of DRV8262. I also hope that you will update the data sheets of 8263 and 8163.

    Thank you again for your support.

    best regards,

    Xiaoshan 

  • 0 in reply to user6542167
    TI__Mastermind 43985 points

    Hi Xiaoshan,

    Understood, thank you. Those Rdson plots will be published in the release version of the datasheet. 

    Regards, Murugavel