Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by JohnDF

  1. JohnDF

    PolySwitch (and other PPTC) advice needed

    Ah thanks. Cleared a few things up. This also bringss up another question I had, if you don't mind. In theory, a dead short would produce infinite current. But how much current will actually be produced if a short occurs? Will the PS simply output its max current? Will there be a very large...
  2. JohnDF

    PolySwitch (and other PPTC) advice needed

    Ah, pardon my ambiguity. These are the 5 and 12 Volt inputs that provide power to the board. Power is connected through pins on a backplane. I am beginning to wonder if at boundary temps, the PPTCs will not function properly as a fuse (Either not detect the fault or trip without a fault)
  3. JohnDF

    PolySwitch (and other PPTC) advice needed

    I am considering using some type of PPTC (specifically the PolySwitch by RayChem) as a "fusing" solution for a board I am designing. I am looking to provide protection on 5 and 12 volt lines. I'd like some input from others who have used this product before. After reviewing the data sheets, it...

Part and Inventory Search