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Original question:

DCP010515DBP incorrect output

DCP011512DB: DCP010515DBP Balance Load

nader niakan90
Intellectual 470 points
Part Number: DCP011512DB

Hi, Do I need t have equal caps and resistors on Vout+ and Vout-. ? What happened if for example I  install 1K on Vout- and 100 Ohms on Vout+ ? Thanks

  • 0
    TI__Mastermind 38230 points

    Nader:

    I recommend equal preloading on each  ± output with equal value capacitors and resistors for equal Vout . The maximum load current for each output voltage  is 33 mA (milli-Amps) .. A fixed  2000Ω resistor per channel preloading  each channel with about 7.5mA.

    Question?

    What is the end application output circuitry? Is it a  pre-driver for  power application power FET pre-driver??

    Tom

  • 0 in reply to Tom Guerin
    Intellectual 470 points

    Tom,

    Thanks for your response.

    End application is to control a pressure sensor.

    The +/- 12 V of this DCP011512 feeds power to a few op-amps. The + 12V output also inputs a VREG to generate a regulated 5V. The portion of my schematic is below:

  • 0 in reply to nader niakan90
    TI__Mastermind 38230 points

    Nader:

    Thanks for the schematic and op-amp to drive pressure sensors.  Is the pressure sensor controlling another higher voltage circuit?

    What is the output average ground voltage  secondary as compared to the DCP011512D primary side ground   ?

    Why are there series resistors ( 1kΩ (-) 12V and 12.5Ω(+12V)  between  each DCP011512D output  polarity and  their output circuitry..

    Tom

  • 0 in reply to Tom Guerin
    Intellectual 470 points
    Tom,
    We have inherited this design, so the caps and resistors on the +/-12 V are there for some reason. I need to know if this imbalance load will cause any abnormality on the output of the DC-DC ? The GND/common of the input and output of the DC-DC is different. The sensor is a thinfilm bridge sensor, which its output goes into an IC to be gained and temp compensated. Thanks
  • 0 in reply to nader niakan90
    TI__Mastermind 38230 points

    Nader:

    Thanks for the update. Each +12V or (-) 12Voutput  voltage level is directly affected  by the output current. .Any load current variation or impedance loading  on either bus will  independently have different  Vout level .

    Tom