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SM72295: Some questions about the parameter definition?

Jayden Li
Expert 3255 points
Part Number: SM72295

Hi team,

We promoted our SM72295 to our customer. While our customer have some questions about some parameters in the datasheet.

1. What is the meaning of VOL and VOH? In my mind, these two parameters should be logic low and logic high for other ICs. While it is obvious that the parameters here are not the same meaning. Could help explain it? And why the range of the two parameters are conflicted.  

2. What are the parameters for. There is no detailed description in the datasheet. 

These questions are urgent! Because our customer is considering other manufacture's IC. So please help on this case as soon as possible. Thanks!

Sincerely,

Jayden-Li

  • 0
    TI__Expert 3255 points

     Sorry for the wrong picture format.

  • 0 in reply to Jayden Li
    TI__Mastermind 23105 points

    Hello Jayden,

    Thank you for supporting the SM72295 with your customer. The VOL and VOH parameters are the voltages at the driver output stage with the driver sinking 100mA for VOL and sourcing 100mA for VOH. This parameter provides the driver output device saturation voltage when driving 100mA and can be used to determine the driver output device on resistance.

    For VOL the driver output is forced low and is sinking 100mA. The Rdson can be determined by VOL x 10x which is 1.6 Ohm typical and 4 Ohms maximum. This voltage is with respect to the driver ground reference which is PGND for LO and HS for HO.

    For VOH the driver output is forced high and is sourcing 100mA. This voltage is VCC-LO for the LO output and VCC-HO for the HO output. The on resistance can be determined the same way as the VOL, 10x the VOH value.

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,

  • 0 in reply to Richard Herring
    TI__Expert 3255 points

    Hi Richard,

    Thanks for your reply.

    One more simple question: Are LOA and HOA be locked to prevent they are driven high at the same time? If not, how customer realize this function, they are afraid short circuit on one leg. Thanks!

    Sincerely,

    Jayden-Li

  • 0 in reply to Jayden Li
    TI__Mastermind 23105 points

    Hello Jayden,

    It looks like the SM72295 driver inputs are independent and do not have the input interlock feature that you inquired. This does give flexibility with different topologies and operating modes.

    To prevent cross conduction conditions, I would make provisions for a small R/C filter on the driver input signals with the R and C close to the driver IC pins. Also confirm that the controller does not have some condition where the LI and HI inputs can be high at the same time.

    Confirm if this addresses your question, or you can post additional questions on this thread.

    Regards,