3.3 - 12 Boost converter

Discussion in 'Power Electronics' started by ElectrAsh, Mar 6, 2018.

  1. ElectrAsh

    Thread Starter New Member

    Feb 17, 2018
    10
    0
    I am designing two boost converters ,one 3.3v to 5V and the other 3.3v to 12v. (2A)
    I have already finalised my 5V design how ever for the 12v one i have a design (credits to 'Bordodynov') which is in slighty different layout to my 5v one.
    I need some advice to make the 12v one into the same layout of 5v (which makes things easire while making the PCB).

    I have attached the schematics below:

    3.3-5V:
    5V.PNG



    3.3-12V: 12V.PNG 12V.PNG 5V.PNG
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,416
    1,223
    Why can't you just use the 5V design and increase R3 to give a higher voltage out?
     
  3. ElectrAsh

    Thread Starter New Member

    Feb 17, 2018
    10
    0
    I have already tried that , in that case i cant get near enough current out!
     
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,416
    1,223
    Then change the inductor and use a Slave mosfet, as per the datasheet.
     
    Last edited: Mar 7, 2018
  5. ebp

    Well-Known Member

    Feb 8, 2018
    1,630
    559
    Is C3 in the 5 volt version really 47 microfarads? If it is, it will make the dynamic performance absolutely dismal.

    How much current? What are you using for an inductor?

    The way those schematics are drawn the circuit is barely recognizable as a boost converter.
     
  6. dendad

    Well-Known Member

    Feb 20, 2016
    1,907
    486
Loading...