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DCP02 Series: 2W miniature isolated DC-DC converter

Milan Rajne
Expert 8885 points

I have an application in which the isolated output DCPO02 series converter needs to float above the input voltage.  For example, lets assume Input is 12V and using DCP021212P, 12Volt isoltaed output is generated.

Now question is: can i connect the negative output terminal to positive input terminal to float the output?

 

  • 0
    TI__Mastermind 38230 points

    This application with DCP021212P does not function with Vin(+) connected to (-) Vout . The primary voltage when  a resistor complete the current link to the primary side ground which  provides a  current  loads the  12Vout of the converter . It does not double the voltage

     The suggestion is to   use the DCP021212DP , dual( ±) unregulated 12V. with (-)  Vout  to ground . (+) Vout  to the 24V circuit which will be higher  when unloaded. The primary ground(-) Vin  can be connected to the secondary (-) vout  which doubles the output voltage.

    Tom

  • 0 in reply to Tom Guerin
    TI__Expert 8885 points

    Dear Tom,

    Thanks for your inputs. The load is always connected between Vout (+) and Vout (-). The intend of connecting Vout (-) to Vin (+) is  not to get double voltage but to float the output voltage above input.

    Since DCP021212P generates isolated output, I understand that if one connected Vout (-) to Vin (-), device will work without any issue, only thing is isoltation will not be maintained.

    In simlilar lines, can i assume that connecting Vout (-) to  Vin(+) should not be an issue as long as load is connected between Vout+ and Vout-?

  • 0 in reply to Milan Rajne
    TI__Mastermind 38230 points

    DCP021212P when  floating the (+) input voltage  on the   (-) Vout circuit across the  isolation barrier does not impact it functionality: This applies only when the (+) vin  and (-) Vout  connection does not  provide a current return trhoug any ground  to the +(12V) input source. 

    Tom