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LM3481 outputs low voltage and now shorts power supply

tom kochawi
Prodigy 80 points
Other Parts Discussed in Thread: LM3481EVAL

I have used a schematic generated by the TI website and made sure all the parts are as needed, wired on a pref-board. A the beginning the voltage went up to around 22V (supposed to be 30V), after a while the voltage dropped to the input voltage and the current limit on my bench power supply went off. After this, it always go to current limit when I power up. I checked pin #8 and I can see a square wave pattern but seems like it is going into shut-down and up again and continues to do that. Idea?

  • 0
    TI__Expert 6365 points

    Hi Tom,

    Thank you for your interest in Ti's Power products.

    Using wires on a perforated board is not going to work.  It's essential to use a proven board layout to validate this type of design.   May I suggest you order an EVM from the following link as your starting point?

    http://www.ti.com/tool/LM3481EVAL?keyMatch=lm3481eval&tisearch=Search-EN