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DRV8210: Timing specification for Dead time and Delay time

Satoshi
Guru 19485 points
Part Number: DRV8210
Other Parts Discussed in Thread: , DRV8220

I have question about DRV8210, DRV8210P, and DRV8220.

These IC's dead time (tDEAD) are larger than propagation delay (tPD), but I have seen the other motor driver are almost tPD > tDEAD.

Please let me know about background for these IC spec become tPD < tDEAD.

And, is there spec information for timing diagram? (relation for tPD, tDEAD, etc) 

Best regards,

Satoshi

  • 0
    TI__Mastermind 37683 points

    Hi Satoshi,

    Thank you for posting to the forum.

    The tPD doesn't have to be higher than tDEAD. These values will be different for each IC and depends on other design specifications.

    There is no spec information for timing diagrams related to the tPD or tDEAD on the datasheet.

  • 0 in reply to Pablo Armet
    Guru 19485 points

    Hi Pablo

    Thank you for reply,

    Additional question, please let me know about delay time for INx to OUTx.

    Below diagram is example from the other IC, I need detailed timing spec of ⑦⑧⑨⑩.

    How are ⑦⑧⑨⑩ timing specification?

    I couldn't judge INx to OUTx delay mean tPD or tPD + tDEAD, from DRV8220 and DRV8210 datasheet. 

    Best regards,

    Satoshi

  • 0 in reply to Satoshi
    TI__Mastermind 37683 points

    Hi Satoshi,

    Let me clarify one thing. tDEAD is not included in the time diagram above. tDEAD is simply the time that is inserted after the H-bridge changes state to prevent cross-conduction (shoot-through). Below is a better delay time diagram which includes the dead time. tPD is the delay from when input (IN) changes state to when the change occurs at the output. After tPD, tDEAD is inserted (H-bridge is in High-Z state during this time) to prevent shoot-through. After tDEAD expires, the output voltage changes state and t_rise or t_fall have to be included in the overall delay time from Input to Output.

    I hope this makes more sense.