Amplify current from DAC?

Discussion in 'General Electronics Chat' started by Scalpel78, Sep 10, 2014.

  1. Scalpel78

    Thread Starter Member

    Aug 11, 2013
    49
    0
    Hi, I've bought a MCP4725 Digital-to-analog converter that I want to use for generating an analog voltage level that I can control via I2C.

    The chip is simple enough, it takes in an input voltage, and then you use I2C to indicate what the output voltage should be.

    The problem is that I now see that it can only supply 25mA. I need about 1000mA.

    Are there any clever circuits using transistors or opamps etc that can be used to achieve a higher current flow while keeping the same voltage level I've set in the DAC?
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi 78,
    This clip is fro the MCP datasheet, shows a current amp circuit, you could further increase the current by using power darlington transistor.
    E
     
  3. nicsky

    New Member

    Aug 1, 2009
    8
    0
  4. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,360
    LM675 can deliver 3A output.
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,003
    3,232
    What power supply voltages do you have?
    What is the maximum and minimum output voltages you want?
    What is the highest rate of voltage change (frequency) you want?
     
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