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SN6501 VCC and transformer CT connections

John Roney
Prodigy 10 points

I see in the datasheet maximum output switch voltage for VCC's of 3 or 5, and all of the circuit examples show the transformer CT fed from the same voltage as VCC

Is there any reason why I can't run the chip from 3.3V or 5V source and connect my primary CT to some "other" rail such as a 10V rail ?

is the maximum voltage rating purely from the VDS of the output switches, or is it based on some function of on resistance / thermal considerations ?

Just looking for options to get an isloated 10-12V (only a few milliamps) from available 3.3V and a loosely regulated 12V rail. I  reaily don't really want to add the transformer switching or load to the 3.3V, and have plenty of 12 available...

Thanks,

John

  • 0
    TI__Intellectual 2200 points

    Hi John,

    The primary CT can be connected to some other rail than the chip supply. 

    But we do not recommend CT supply beyond 5.5V. The swing on D1, D2 is equal to 2x the CT voltage, not accounting for overshoots, and the AbsMax on D1 and D2 is 14V.

    Hope this helps. 

    Rgds,

    Anant