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Old 16th June 2015, 08:51 AM   #1
akis is offline akis  United Kingdom
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Default OPA445 as building block

Has anyone used the OPA445 as the "driver" in a power amp? What voltages did you feed it? The datasheet says abs. max 50V each rail, and I was thnking of feeding it 48V each rail so as to make a 200W/4R audio amp!
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Old 16th June 2015, 10:01 AM   #2
Did it Himself
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48V rails are too high, 45V is the max recommended. When you look into what additional circuitry you need (e.g. bias and drivers), it is just as easy and simple and actually cheaper to make a discrete amp.
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Last edited by richie00boy; 16th June 2015 at 10:03 AM.
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Old 19th June 2015, 01:54 AM   #3
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OPA445 also has only 2MHz GBP. Among high voltage integrated control devices quite a bit more loop gain is available from the LME49810 and LME49830.
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Old 20th June 2015, 05:45 AM   #4
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Amplificateur HD4450
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