How many amperes for a parallelled lm4780

jaste · 24th January 2007, 03:06 PM

Hi! I just bought a big toroid with multiple secondaries, two of them are labeled 24 VAC and 4,9 amperes. Now I´m wondering if that is sufficent to drive two lm4780 chips, both in parallelled configuration?
Thanks!

jaste · 24th January 2007, 04:31 PM

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?

AndrewT · 24th January 2007, 06:00 PM

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.

24th January 2007, 03:06 PM	#1
jaste diyAudio Member Join Date: Dec 2005 Location: Stockholm	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 I´m wondering if that is sufficent to drive two lm4780 chips, both in parallelled configuration? Thanks!

24th January 2007, 06:00 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Effective load impedances – SL Phoenix - drivers parallelled	rick57	Multi-Way	0	12th April 2006 02:17 PM
16ohm parallelled crossover	ocool_15	Multi-Way	2	8th October 2005 04:56 AM
Amperes of Pass amps & Pass for ESL	rick57	Pass Labs	3	4th August 2005 03:28 PM
Amperes, volts, ohms, "blowing" electronic components...	Datoyminaytah	Car Audio	6	17th August 2004 03:19 AM
Hi there fellow amperes	Blue Glow	Introductions	3	28th April 2003 08:16 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

24th January 2007, 04:31 PM	#2
jaste diyAudio Member Join Date: Dec 2005 Location: Stockholm	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?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)