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PMP10098: PMP10098 does not start with 20V AC input supply

ANURAG LOKHANDE
Prodigy 70 points
Part Number: PMP10098

Tool/software:

Hi,

PMP10098 does not start with 20V AC input at no load and at load.

Input voltage dips when converter tries to start. 

What could be the reason?

Regards,

Anurag

  • 0
    TI__Intellectual 1695 points

    Hi Anurag,

    Where do you measure the voltage? How long are the cables between your lab supply and the board?

  • 0 in reply to Markus Zehendner
    Prodigy 70 points

    Hi,

    Voltage across C9 is 28V DC.

    How long are the cables between your lab supply and the board?

    --> less than 1 meter.

  • 0
    TI__Intellectual 760 points

    Hi Anurag,

    I had a look on the schematic and it looks like a kind of a constant current UVLO circuit. R2 sets the current to charge C16. R5/R13 defines the threshold voltage too turn on Q1. First I would recommend to increase R13 (for example 40kohm). Next, you could also increase the constant current by reducing R2 (for example 35kohm). After you did changes please check all voltage to be sure that you are not above the voltage ratings of the parts and controller. Just in case, you could add an additional zener diode too clamp the voltage. 

    Thanks,

    Florian