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THS4130: Part runs very hot at +/-12V with no load on outputs

Richard Tarbell56
Intellectual 335 points
Part Number: THS4130

Greetings!

Using the THS4130 fully differential amplifier with a gain of 20 (20k / 1k resistors), at +/- 12V.  When I power the board, all of these THS4130 parts run hot to the touch with no load on their output.  Is this "normal"?  If I reduce the power supplies to +/-8V, that makes them "finger touchable".  The parts are rated up to +/-15V - am I doing something wrong?

  • 0
    Guru 48395 points

    Morning Richard, 

    the typ supply current is a bit high on this part, 12.5mA. At 24V supply across it that is 300mW quiescent, 

    Not sure which package you are using but say the DGK at 134C/W Tja, that is indeed 40C rise from ambient and you should feel that.

    Or, it could be oscillating - had you checked that?