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Power Supply for DRV8305/DRV8305-Q1 and deadtime setting

Maxime Torrelli
Intellectual 610 points
Other Parts Discussed in Thread: DRV8305-Q1, DRV8305, DRV8301

Hi TI community,

I am wondering if it's possible to use the DRV8305 and DRV8305-Q1 in a 48V application by supplying the three-phase inverter with 48V and using something like a simple shunt voltage regulator to pull down the voltage, to 42-45V, to supply the driver? Is there any effect on the driver's capability to driver the bridge?

Another question is the deadtime setting by a resistor safier than the SPI deadtime setting?

Sincerely,

Maxime

  • 0
    TI__Guru** 114905 points
    Hi Maxime,

    It is possible, although the effect to the high side FET may make it impractical. The VGS of the high side FETS will be reduced by the difference in voltage between the inverter voltage and the lowered PVDD supplied to the DRV8305.

    Another item to keep in mind is that the divided voltage with track the inverter voltage. If the inverter voltage spikes, the divided voltage will also spike.

    The DRV8301 with a 60V recommended maximum is a better choice if you need the higher voltage.

    Using a resistor or the SPI are both safe. Placing a resistor in series with the gate affects the deadtime and should be accounted for in the register settings.