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 opamp buffers power output q
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 7th October 2004, 07:16 PM #1 diyAudio Member   Join Date: Mar 2004 Location: Borås Sweden opamp buffers power output q Hi! Just want to get some input in a question I been thinking about... What is the relationship between a opamp-buffer's output current vs supply current when looking at it's power dissipation? Tryin to make my q clearer...If a buffer's data say's : output current 100 mA supply current 10 mA And...PD 1W Does this means that, with 30v ps, u can take out: (1W/30v = 33.3 mA and supply current 10 mA = 33.3 - 10 )= 23.3 mA? That is u cant take out MORE than 23.3 mA? Or is there another relationship since one data is DC mA and the other AC mA? Greatly appreciate any answer... Thanks /Peder
 7th October 2004, 07:28 PM #2 diyAudio Member     Join Date: Apr 2002 Location: Prague Supply current of 10 mA is with no load. Output current (up to 100mA) is added to supply current in appropriate supply lead (+V or -V). Pd will depend not only on load current, but supply voltage and output voltage as well. Power dissipation also depends on output stage class of operation, we can assume class B/AB.
 7th October 2004, 08:00 PM #3 diyAudio Member     Join Date: Apr 2002 Location: Prague Please also have a look at maximum power dissipation vs. temperature and package type. For BUF634 in TO-220, max. allowed power dissipation is 2W without heatsink (free air). With infinite heatsink, maximum allowed power dissipation increases to 9W ! This says that reasonable heatsink may increase Pd considerably.
 8th October 2004, 09:32 PM #4 diyAudio Member   Join Date: Mar 2004 Location: Borås Sweden Thanx PMA! Guess that confirmed what I was into..I think.. anyway thnx.. /Peder

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