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Constant Current Source Design which can source 20A current

Hi

Suggest a constant current regulator which can source 20A current and support a voltage output of minimum 100V. 

If modification is made, can i use LT3763 to operate at 100V like by using GATE drivers.

Regards

Bivin George

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  • Hi FormerMember

    Kindly explain " Constant-Current Regulation (IAVGSNSP and IAVGSNSN Pins)The  LTC3779  provides  a  constant-current  regulation loop for either input or output current. A sensing resistor close  to  the  input  or  output  capacitor  will  sense  the  input  or  output  current.  When  the  current  exceeds  the  programmed  current  limit,  the  voltage  on  the  ITH  pin  will  be  pulled  down  to  maintain  the  desired  maximum input or output current. " which is given in data-sheet of LTC3779. As per the discussion with your local FAE, he confirmed that LTC3779 can be used as constant current source (with reference to figure in last page of data-sheet) and mentioned it can be used to deliver constant 10A current at maximum 48V output but he was not sure about how to maintain constant current.

    Also Lt-spice file for this part is not working, screen shot of error message is attached in above post.

    LT-powercad also don't have this part, kindly update software asap.

    If this IC is not the right part kindly update your local FAE and suggest a part to implement requirement given in question.

    Regards & Thanks

    Bivin George

Reply
  • Hi FormerMember

    Kindly explain " Constant-Current Regulation (IAVGSNSP and IAVGSNSN Pins)The  LTC3779  provides  a  constant-current  regulation loop for either input or output current. A sensing resistor close  to  the  input  or  output  capacitor  will  sense  the  input  or  output  current.  When  the  current  exceeds  the  programmed  current  limit,  the  voltage  on  the  ITH  pin  will  be  pulled  down  to  maintain  the  desired  maximum input or output current. " which is given in data-sheet of LTC3779. As per the discussion with your local FAE, he confirmed that LTC3779 can be used as constant current source (with reference to figure in last page of data-sheet) and mentioned it can be used to deliver constant 10A current at maximum 48V output but he was not sure about how to maintain constant current.

    Also Lt-spice file for this part is not working, screen shot of error message is attached in above post.

    LT-powercad also don't have this part, kindly update software asap.

    If this IC is not the right part kindly update your local FAE and suggest a part to implement requirement given in question.

    Regards & Thanks

    Bivin George

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