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LM5034: Active Clamp Forward Conveter

Nishanth S
Prodigy 80 points
Part Number: LM5034

Hi,

We are using LM5034 to convert 48V to 5V (single output). I have pain full problem like some of the board will burnt (Switching FET) during testing because of high current flow in secondary winding of isolation transformer (Current Transformer) (4:1) and unfortunately we couldn't find the actual reason for it, but observed similarity in failed/burnt board that was solder balls presented in secondary winding of same transformer, my dilemma is whether this solder balls will cause huge current flow in secondary windings or not?

Thanks in Advance.

  • 0
    TI__Genius 13660 points
    Hi Nishanth,

    It seems a manufacturing issue. Maybe the solder balls lead to the short circuit.
    Since as you said, not all the boards failed in testing, and the failed board had the same case that there were solder balls in the secondary winding of the same transformer.
    So have you find out that if there were short issue in the failed board due to solder balls? and whether the high temp due to high current caused the solder balls or the solder balls have already existed before testing?

    Regards,
    Teng
  • 0 in reply to Teng Feng
    Prodigy 80 points

    Hi Teng,

    @case-1 observed solder balls in between windings

    @case-2 observed solder balls as well as short at end of windings

    Also observed solder balls in bare component (incoming lot).

    So is there any possibility where solder ball could create high current in secondary winding?

  • 0 in reply to Nishanth S
    Prodigy 80 points
    Final my question is whether this solder can create excess current flow in secondary windings?
  • 0 in reply to Nishanth S
    TI__Genius 13660 points
    Hi Nishanth,

    Solder ball would not cause the high current if it doesn't short the winding.
    So you just need to check that if it has cause the circuit short of winding or other components?

    Regards,
    Teng