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power factor correction using ucc38503

Abhijith v p
Prodigy 20 points
Other Parts Discussed in Thread: UCC38503, UCC38500

hello,

 

i am new here and i am currently doing a project using ucc38503 pfc ic..

 

in the circuit diagram given in the application note, i found the components were numbered in a random order R1 in one end and R2 in the other end.. and also, some of the components were missing according to the numbering, ie, R9  was missing in the sample circuit given.

 

what i want to ask is , is there any specific naming criteria for these components?

dunno whether this is some blunder or sth.. somebody pls clarify, if something is there in naming.

 

 

thanx

 

 

 

  • 0
    TI__Expert 4375 points

    There is no criteria for the numbering of the parts on the board. This is up to the individual engineer. the schematic in the UCC38503 data sheet (figure 9) is from the EVM for it's sister part he UCC38500. More information on this design can be found at http://focus.ti.com/docs/toolsw/folders/print/ucc38500evm.html.

     

    Regards,

     

    Richard.

  • 0 in reply to Richard Garvey
    Prodigy 20 points

    thanx for your reply sir.

     

    while i was designing pcb , i felt that keeping continously numbered components closer 'd make design easier. thats why the question. thank you for your support

     

     

    abhijith

  • 0 in reply to Richard Garvey
    Intellectual 420 points

    Hi Richard

    I'd like to ask you a direct question regarding the UCC38500 PFC/PWM Combination Controller, so I apologize for my jumping into the middle of another post: we'd like to explore its use as a general purpose AC/DC power supply in a new product, but we are worried about its performance at low power levels (5-10 W output power). Our required DC output voltage is 5,0 V and the absolute maximum power demand will typically be about 25-30 W. We would like to be able to accept universal AC inputs from say 85-265 V AC @ 45-65 Hz.

    Are our worries about operation at low output power levels justified and what is the minimum output / load power at which the UCC38500 (as implemented on say the UCC38500 EVM) would still be operating in a stable and relatively efficient manner?

    Thanks and regards

    Ockie