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DRV8304: Can drv8304 drive my mosfets?

Part Number: DRV8304

Hi,

I calculate the IDRIVEP and IDRIVEP like the equation in datasheet:

Idrivep> Qgd/tr and Idriven>Qgd/tf, my mosfet has tr = 23 ns to 50 ns and Qgd 12,3 nC so IDRIVEP is ca. 0,53mA to 0,246 mA the DRV8304 has a minimum of 15 mA.

What is it means? Maybe I cannot use this mosfet with DRV8304?

I can only use 15mA/30mA for the IDRIVEP/N

I am using the sira80dp.

King Regards,

Nikos

  • Hi Nikolaoas,

    Thank you for posting to the MD forum!

    First of all, for your IDRIVE calculations, you forgot to multiply IDRIVE current by 1000. You would be expecting ideal IDRIVE settings of 530 mA to 246 mA. 

    Most customers consider 100 - 200 ns a fast rise time for their applications. Switching the MOSFETs any faster than that will cause EMI issues and will make it dangerous for the longevity of the FETs and gate driver IC unless you have minimal inductance on your traces. I would recommend having a longer rise and fall time so you can use an IDRIVE setting that fits within the specs of the DRV8304.

    For instance, using an IDRIVE of 105 mA will give you 12.3nC / 105mA = 117 ns rise time. 

  • Hi,

    thank you for your reply, I found it very helpful.

    I did not forget to multiply the values, I misunderstood the datasheet on page 47, I didn't check that the result was in Amper. 

    Maybe could you explain the difference between IDRIVEN and IDRIVEP? Or I should ask a new question?

  • Hi Nikolaoas,

    IDRIVEP is the peak source current from the DRV8304 for the HS/LS FETs, and IDRIVEN is the peak sink current into the DRV8304 for the HS/LS FETs. Calculating both values is the same process as before for calculating IDRIVEP and IDRIVEN.