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UCC12050: Connect the outputs of two UCC12050 converters in series to achieve 5V, GND and -5V

Jonathan Geronga
Expert 7930 points
Part Number: UCC12050
Other Parts Discussed in Thread: UCC12040

Hi Team,

Is this design implementation of our customer possible for UCC12050?
They want to connect the outputs of two UCC12050 converters in series to achieve 5V, GND and -5V

Please let me know your inputs.

Thanks,

Jonathan

  • 0
    TI__Mastermind 32975 points

    Jonathan,

    No problem on that use of two UCC12050's. They can be used for +/- VISO as you are showing. The outputs can also be stacked in series to generate higher isolated output voltages. The thing to emphasize is that the outputs of two or more UCC12040/50 cannot be connect in parallel - they do not share current. A few additional tips worth considering:

    1. Make sure the 0.1 uF is closest to the IC pin....closer than the 10 uF capacitor
    2. SYNC connected to GNDP is good but SYNC_OK is recommended to be connected to VINP through a 100-kΩ pull up resistor
    3. The UCC12050 outputs are well regulated. Output diodes are not really necessary, unless something about the load is potentially able to pull the output above the regulated VISO?
    4. For the -5VISO output, connect the output between pins 14-16...same as you have done for the +5VISO
    5. Pins 6-8 are for primary heatsinking, pins 2-3 are for primary input power. Pins 9-12 are for secondary heatsinking, pins 14-16 are for VISO power - the schematic below is drawn to reflect this and serve as a guide for designing the PCB.

    Regards,

    Steve M