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Original question:

UCC28810EVM-003: Output Constant Current

UCC28810EVM-003: Power Supply

Payal Dwivedi
Prodigy 50 points
Part Number: UCC28810EVM-003
Other Parts Discussed in Thread: UCC28810, UCC28811

Is it possible to supply power from LED Power Driver Board using UCC28810EVM-003 having UCC28810/11 ICs to the LED driver microcontroller?

If possible, how will we supply output voltage of 18 V( i.e. operating voltage of IC UCC28811 in buck stage) from the LED Power Driver Board to LED Driver Microcontroller ?

  • 0
    TI__Genius 10555 points

    I'm sorry Payal, I'm not sure exactly what you're asking for.  

    So that I can help you:

    Please clarify what you mean by "LED Power Driver Board".

    Please provide a diagram or marked-up schematic of what you're trying to accomplish (including labels where appropriate).

    Thank you,

    Ray

  • 0 in reply to Ray DiCecco
    Prodigy 50 points

    8688.Block Diagram.docx

    Hi Ray 

    Hope my block diagram may help you to get more clear view of the scenario. LED Power Driver Board, refers to the LED Driver board supplying power to the LEDs to glow. So we wanted to know whether the power that is being used internally by ICs of LED Driver can be used for the microcontroller also. Or else we have to provide external power supply to it?

  • 0 in reply to Payal Dwivedi
    TI__Genius 10555 points

    Thank you for the block diagram Payal, that helps a lot.

    It's difficult to say since it depends on the power requirements of your microcontroller and also the start-up sequence you desire. 

    VCC should be available as soon as AC is applied but it's current capability is limited by R14 & R16 until U1 is enabled.  Typically a microcontroller requires relatively high burst-currents so you'll have to take that into consideration.  There are likely other potential pitfalls, so I'd strongly suggest considering a dedicated power source for your microcontroller. 

    Sorry that I can't be more specific.  You are the expert on your system, so I can't tell you for sure whether this will or will not work.  I recommend you proto-type it and also have a provisional power source in case VCC is insufficient or otherwise problematic in your system.

    Ray

  • 0 in reply to Ray DiCecco
    Prodigy 50 points

    Hi Ray,

    Thanks a lot for the information. This helped us.