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DRV8830: Inquiry of RDSON and duty control

Intellectual 2175 points

Replies: 8

Views: 165

Part Number: DRV8830

Hi Team,

Would you support my customer's inquiry below because

there was no description on the data sheet.

■ DRV8830

・ Iout vs MDOUT1 / MDOUT2

      * I want to know how much the drop by Rds changes.

      * I want to know the behavior of Vcc = 3.5v / 4.0v / 4.5v (because Rds changes with Vcc)

・ When Vout is set to 5V, What is the behavior when Vcc is changed to lower than 5V?

      * I want to check the behavior when Vcc < set voltage

     * Does it Keep 100% duty for example?

Thanks

Best regards,

Shidara

 

  • Hi Shidara-san,

    Can you clarify the following questions?

    ・ Iout vs MDOUT1 / MDOUT2

          * I want to know how much the drop by Rds changes.

    HH -> Can you confirm if you are asking how much Rds drops as what parameter(s) changes?

          * I want to know the behavior of Vcc = 3.5v / 4.0v / 4.5v (because Rds changes with Vcc)

    HH -> The behavior of Rds as Vcc is set to those three values?

    ・ When Vout is set to 5V, What is the behavior when Vcc is changed to lower than 5V?

          * I want to check the behavior when Vcc < set voltage

    HH -> To what minimum Vcc value do you want confirmation?

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Shidara-san,

    Do you have an update here? Thank you.

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Shidara-san,

    I will close this e2e for now. Please, reply to this thread or open a new one with your inputs. Thank you.

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Hector-san

    I'm sorry to reply late.

    Would you refer the answer below?

    >Can you clarify the following questions?

    >・ Iout vs MDOUT1 / MDOUT2

    >     * I want to know how much the drop by Rds changes.

    >HH -> Can you confirm if you are asking how much Rds drops as what parameter(s) changes?

      → Change parameter is Iout(0A to 1A)when Vcc=3.5V, 4.0V, 4.5V

     

    >     * I want to know the behavior of Vcc = 3.5v / 4.0v / 4.5v

    >(because Rds changes with Vcc) HH -> The behavior of Rds as Vcc is set to those three values?

      → yes

     

    >・ When Vout is set to 5V, What is the behavior when Vcc is changed to lower than 5V?

    >     * I want to check the behavior when Vcc < set voltage HH -> To

    >what minimum Vcc value do you want confirmation?

      → when Vcc=4.0V and 4.5V

    Thanks

    Best regards,

    Shidara

  • In reply to K.Shidara:

    Hi Shidara-san,

    We are on holidays until next Monday. Please, expect a response early next week.

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Shidara-san,

    It will require more time to provide these answers. I expect to have a response for you by end of this week.

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Shidara-san,

    We do not have Rds(on) data across current range you have indicated. We have data on datasheet, which is Rds(on) changes across Vcc and three temperature points. Please, see the graph below:

     

    Hector Hernandez
    Motor Applications Team

  • In reply to Hector Hernandez Luque:

    Hi Hector-san

    Thank you very much for your answer.

    I understood.

    Thanks

    Best regards,
    Shidara

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