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PMP8740: UCC18180,UCC27517,LM5023

CHIEN
Prodigy 160 points
Part Number: PMP8740

Hi 

I have some problem , now I just think  test BOOST PFC & AUX  board ,how do I  it method of testing

  • 0
    TI__Expert 5745 points

    Hi Chien,

    I have asked the original designer to comment.

    In general, the test procedure should be the same as normal.

    thanks,

    Robert

  • 0 in reply to Robert Taylor1
    Prodigy 160 points

    Hi Robert

    so I just prepare AC power source , DC electronic load

    1. Connect input terminals (J2-L and J2- L)of the board to the AC power source
    2.Connect output terminals (J1-1 and J1-3) to the electronic load
    3. Gradually increase the input voltage from 0 V to turn on the voltage of 190-V AC.
    4. Turn on the load to draw current from the output terminals of the PFC.
    Are the above test steps correct?

  • 0 in reply to CHIEN
    TI__Expert 5745 points

    Hi Chien,

    I have asked the original design to comment on your startup procedure.

    Thanks,

    Robert 

  • 0 in reply to Robert Taylor1
    TI__Expert 5515 points

    Hi Chien,

    Please consider that this PFC stage needs a digital input from the microcontroller (which is on the DC/DC board) to close the relay K1 as soon as the inrush current limit phase is completed. In order to test this board alone, I suggest to add a manual switch, which should connect pin 3 of J5 (inrush relay net) and pin 9 of the same connector. This way a 12V signal is supplied to the net "inrush relay" and Q3 will close the relay K1. Please do that after you wait at least few hundreds of milliseconds after applying the AC voltage (simulating a timer, done normally by firmware).

    Furthermore, the on-board auxiliary power supply expects some load on the output (net VCC_FB), which is the bias load of the DC/DC converter + microcontroller. Since you are testing it alone, please add a dummy load (resistor) between pin 9 and 8 of J5 (typically 120 Ohm 2W, which means 100mA load, is already enough).

    As soon as you turn off the AC source, please discharge the output capacitors C5, C8, C9 and C10 because they take time to be discharged and the voltage here is dangerous, or course. Then, after turning the AC source off, turn off also the switch you added. This way the relay K1 opens and you will be ready for the next test.

    Best regards,

    Roberto

  • 0 in reply to Roberto S.
    Prodigy 160 points

    Hi Roberto

    thank your reply , I will try it.