How do I connect this DC-DC converter?

Discussion in 'Power Electronics' started by Paul Hemans, Jul 4, 2016.

  1. Paul Hemans

    Thread Starter New Member

    Jul 8, 2015
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    I have a 2.7V 500F super capacitor that I would like to hold the output at 5V to power an Arduino. Here is the DC-DC module that I bought;
    [​IMG]
    I would have expected IN+, IN- to be connected to the capacitor and 5V and GND to go to the Arduino. If that is true, then what is D+ and D- used for?

    Thanks.
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Do you have any specs. from supplier ?
     
  3. #12

    Expert

    Nov 30, 2010
    17,897
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    From this side of the board, D+ and D- aren't going anywhere. If they are also not connected on the other side, they don't do anything except confuse people.
     
  4. dannyf

    Well-Known Member

    Sep 13, 2015
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    that side is meant for a usb connector.
     
    JWHassler and Paul Hemans like this.
  5. Paul Hemans

    Thread Starter New Member

    Jul 8, 2015
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    Thanks guys it seems I won't be needing the D+ and D-
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    I would guess this is a step up converter, so if the input it less than 2.7 volts the cap goes from IN+ to IN-

    If this is not a step up converter the cap is not suitable for the use you want.
     
  7. dannyf

    Well-Known Member

    Sep 13, 2015
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    It is unlikely those two pins are actually connected to anything.
     
  8. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    What's your input voltage? One might assume that it's less than 2.7V, since that is your capacitor rating.
     
  9. Ylli

    Member

    Nov 13, 2015
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    I see an input inductor (220 uh), switching transistor (E5OD), and schottky diode (SS14). There must be a controller/regulator of some kind on the back side of the board to drive the switching transistor and regulate the output at 5 volts. D+ and D- might interface to that controller.
     
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