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LM3481-Q1: LM3481-Q1 along with IGBT(F4-50R07W1H3_B11A)

rajkumar ch
Prodigy 40 points
Part Number: LM3481-Q1
Other Parts Discussed in Thread: LM3481

As i mentioned the part above for the boost converter can i use the any IGBT(F4-50R07W1H3_B11A, infineon ) switch along with this IC in DC- dc converter , because i need to design boost converter for max input voltage of 48V to maximum output voltage of 400v

  • 0
    TI__Guru 68495 points

    The LM3481 driver may not drive IGBT well. There are a lot MOSFETs at similar voltage rating , so I recommend you to use an MOSFET instead. Since Vin=48V and Vout=400V, it requires a duty cycle of at least 88%, but it is beyond the max duty cycle of the LM3481. Two options: (1) use the charge pump as show in the reference design circuit (www.ti.com/.../PMP20212), (2) use a flyback topology and a transformer to help produce high voltage at a lower duty cycle.

  • 0 in reply to Youhao Xi
    Prodigy 40 points

    hi thanks for your reply in the reference design what you have mentioned is fine at the output voltage of 300v , but the current ratting is too small. is there any way to boost the current upto 5 to 6 ampheres at the same output voltage. i am planning to use this boost converter in feeding the 3 phase induction motor with a max current rating of 7 ampheres with 380/415v .. how can i reach this ratings with my boost converter and 3 phase inverter. 

  • 0 in reply to rajkumar ch
    TI__Guru 68495 points
    The power level is far beyond the capability of this boost controller. The driver peak current is about 1A and it cannot drive the FET efficiently to process about 3kW: 7A x 415V. You should try a full bridge topology or LLC for such high power.
  • 0 in reply to Youhao Xi
    Prodigy 40 points

    what about if i use 12v, 100 A battery to run the induction motor of 400v , 3A  with suitable boost converter convert from 12v to 400v and inverter to 3 phase. 

  • 0 in reply to rajkumar ch
    TI__Guru 68495 points
    12V to 400V boost requires a duty cycle of 97%, which means all your power will be delivered to the load in the rest of the switching cycle, which is 3% of the cycle. It is not suitable. You'd better to use a circuit with power transformer, like a full bridge converter, and design with a reasonable duty cycle with the help of selecting a proper transformer turns ratio.
  • 0 in reply to Youhao Xi
    Prodigy 40 points

    Hi thanks for your information, and i would like to ask you that where can i find the design calculations for the full bridge converter to design my converter. 

  • 0 in reply to rajkumar ch
    TI__Mastermind 21720 points

    rajkumar,

    A good place to check for designs is one the reference design library. You will probably be able to find a design close to your requirements.

    -Garrett