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DRV8305 / DRV 3201 at 150V application

Girish Ramachandran88
Prodigy 20 points
Other Parts Discussed in Thread: DRV8305

Has anyone had any experience with using the DRV8305 or DRV3201 driver IC with a motor DC bus of around 150V DC?

I am considering running my inverter bridge at 150VDC and providing a separate lower voltage (say 28V DC) to power the driver IC. I was then considering using a simple resistor divider (with diode clamps) on the VDRAIN and SHx lines to enable the IC to still monitor VDS for protection purposes. Driver IC and inverter bridge share common ground. 

Will this work? Do you foresee any problems with this approach?

Thank you

Girish

  • 0
    TI__Guru** 114905 points
    Hi Girish,

    The inverter bridge will need ~160V to turn on the high side FETs. Where does this come from?

    The DRV8305 would typically provide this voltage to the high side gates.
  • 0 in reply to Rick Duncan
    Prodigy 20 points

    Hello Rick

    I am not sure I follow your question. The inverter bridge is powered by a 150V battery DC bus in application. However, I see that the maximum PVDD per DRV8305 datasheet is +45V DC. What I am considering is detailed in the attached PNG file.

    All connections highlighted in yellow will have a voltage divider to divide down the 150V down to acceptable levels for the DRV8305. The VCC for the chip will be powered by a separate 28VDC. 

    I hope this is clearer. 

    Thanks

    Girish

  • 0 in reply to Girish Ramachandran88
    TI__Guru** 114905 points
    Hi Girish,

    Sorry I was not clear. Based on your drawing the GH_A of the DRV8305 will be connected to the gate of the high side FET. It will not fully turn on the high side FET.

    To fully turn on the high side FET requires the gate to source voltage of the high side to be approximately ~10V. The source should be 150V, so the gate should be ~160V. The DRV8305 cannot provide this voltage.