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UCC29910AEVM-730: a few questions

Viktorija Cecil
Mastermind 18491 points

Part Number: UCC29910AEVM-730

Team, please help answer below questions:

  1. How do the BSCTL pin and related circuit work?
  2. Why does inductor L4 has secondary winding? What is the purpose?
  3. Is there anyway to change switching frequency?
  4. Is the current in L4 discontinuous conduction mode?
  5. If I change the design to 460Vac input, is there any concern for using UCC29910A?

Thanks

Viktorija

  • 0
    TI__Guru 74115 points
    1. How do the BSCTL pin and related circuit work?

      The datasheet page 12 describes how BSCTL works along with BIASSNS to determine when turn on/off depletion MOSFET for start up. 

    2. Why does inductor L4 has secondary winding? What is the purpose?

      To provide bias to UCC29910A after startup.

    3. Is there anyway to change switching frequency?

      No, in normal mode, the frequency is fixed.

    4. Is the current in L4 discontinuous conduction mode?

      In general DCM but possible in CCM especially during transient. 

    5. If I change the design to 460Vac input, is there any concern for using UCC29910A?

      The switch is on high side - higher input will require further cost to deal with how to drive as controller is placed at low side. No direct path from AC input to bulk-storage cap complicating surge management. much bigger capacitance for hold up. AC line current cross-over distortion may become further concerned.