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TIDA-01160: r(on) value confirmed

Xiaobing (Eric)
Intellectual 895 points
Part Number: TIDA-01160
Other Parts Discussed in Thread: UCC5320

Hi All, 

  Thanks for your time. I have a question in  reference guide, which are:

 1) In 2.3.2.5.1 Off to On Transition section, how about the value of r(on)? How about the value for Voltage  across  IGBT  gate, whether is 23V?

 2) In 2.3.2.5.2 On to Off Transition section, how aobut the value of r(off)? Can i have your comments? Thank you. 

Regards,

Xiaobing (Eric)

  • 0
    TI__Prodigy 30 points
    Hi Xiaobing (Eric),

    Thanks for your question. You can find the information regarding the gate driver output resistance in section 8.3.3 (Output Stage) in UCC5320 datasheet. Here is the link-www.ti.com/.../ucc5320.pdf

    Regards,
    Yamini
  • 0 in reply to Yamini Sharma
    Intellectual 895 points
    Thanks for your comments, Yamini.
    Refer the formual in 2.3.2.5.1, R(Gon)=Voltage arcoss igbt gate/I(source)-r(on),
    The voltage arcoss igbt gate is 15+8V and I source is 10A in documents, the r(on) euqal to 3.27R (4.5R*12R/16.5R) which refer datasheet, so:
    R(Gon)=23V/10A-3.27R=-0.97R, it's not a correct value.

    Can you please correct any step or value are wrong?

    Regards,

    Xiaobing (Eric)
  • 0 in reply to Xiaobing (Eric)
    TI__Prodigy 30 points
    Hi Xiaobing (Eric),

    Thanks for your question. The value of the external gate resistor will depend on the current ,the gate driver can source/sink and ,the amount of heat you want the dissipate on the gate driver and the gate resistor. For gate current of 2 A and internal resistamce of 3.27R, the ideal value to be used is R(Gon)=23V/2A-3.27R= 8.23R. This can be optimized by observing the thermal performance so that you can dissipate almost equal amount of heat in the gate resistor and gate driver.

    Regards,
    Yamini