Need help with LT3471 for +-40V supply

Discussion in 'General Electronics Chat' started by Tristan Demanuele, Sep 23, 2015.

  1. Tristan Demanuele

    Thread Starter New Member

    Aug 19, 2015
    9
    0
    Hi all,

    Currently im using LT3471 to configure a dual rail supply of +/-40V from a 3.3V supply.
    The datasheet says that the IC can produce such voltages.

    Does anyone have schematics or maybe be of any help please? :)

    Thanks!
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,789
    945
    The application note gives a circuit and details how to scale resistor values to achieve the desired output voltage.
     
  3. TheButtonThief

    Active Member

    Feb 26, 2011
    219
    38
    you want to put 3.3V in and get 40V out?!
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,011
    3,233
    As Kermit2, stated, read the data sheet. It has all the info you need to use the chip.
    Layout is also critical, so note the layout suggestions.

    How much current do you need at ±40V and how much current is available from the 3.3V supply?

    Edit: Understand that the 3.3V current will be over 40/3.3 = 12.1 times the current of each output (the values add from each output, so if both outputs have the same current it would be over 24.2 times the output current).

    The free simulation program, LTspice from Linear Technology, includes the LT3471 model.
    If you right click on its schematic symbol and select the Macromodel's test fixture, a test schematic will appear with the components to generate ±7V outputs to help you get started with the device and understand how it works..
     
    Last edited: Sep 23, 2015
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