How many amperes for a parallelled lm4780 - diyAudio
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Old 24th January 2007, 03:06 PM   #1
jaste is offline jaste  Sweden
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Default How many amperes for a parallelled lm4780

Hi! I just bought a big toroid with multiple secondaries, two of them are labeled 24 VAC and 4,9 amperes. Now Im wondering if that is sufficent to drive two lm4780 chips, both in parallelled configuration?
Thanks!
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Old 24th January 2007, 04:31 PM   #2
jaste is offline jaste  Sweden
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Ok, sorry for posting so fast... I've been doing some research and found that for a 8 ohm load it would be ok but for a 4 ohm load it might be difficult, is that right?
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Old 24th January 2007, 06:00 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
some quick numbers.
VA=(24+24)*4.9=235VA
maximum output power~=VA/1.5=235/1.5=156W.

This transformer will support 150W or 75W+75W or 50W+50W+50W of good quality power if the PSU is scaled accordingly.
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