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DRV830x Handshaking feature and its effect?

Simon Godfrind
Prodigy 50 points
Other Parts Discussed in Thread: DRV8301, DRV8303

Hello everybody!

I would like to know how the feature called "automatic handshaking" works on the drv8303 (same for drv8301).

Does it modulates dv/dt one the gate thus on the phase node?

Does it modulates the deadtime? How it works specifically?

Does it replace the need of any external R_gate and/or with diode in parallel?

Does the output stage of drv8303 offer assymetric turn on turn off slew rate?

Finaly, which slew rate (dv/dt) on phase node the chip can handle for the output stage to behave normaly.

Thank you in advance,

  • 0
    TI__Guru** 114905 points
    Hi Simon,

    Our expert has been notified and should reply soon.
  • 0
    TI__Mastermind 21320 points

    Hi Simon,

    The automatic handshaking is for shoot-through protection and dead-time optimization. It is not for slew rate adjustment.

    The gate drive will sense the gate to source voltage to determine when to begin the turn on of the opposite MOSFET during a switching period.

    Yes, the DRV8303 output drive is asymmetric. See page 8 of the datasheet for the 3 different settings.

    An external gate resistor may still be required depending on if your desired slew rate falls outside these setting.

    Do you have a requirement? I have see no issues down to 1 V/ 1 ns slews. This is usually more limited by parasitics in the layout and power MOSFETs.

  • 0 in reply to Nicholas Oborny
    Prodigy 50 points

    Thank you for your answer.

    About the slew rates, I will try slower ones than 1/1ns then.

    It was just to have a good point to start. 

    Sincerly,