LM4780 PCB for switched power supply - diyAudio
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Old 7th March 2011, 11:09 PM   #1
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Default LM4780 PCB for switched power supply

does anyone know where can I find a PCB layout for LM4780 when using a switched power supply ?
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Old 8th March 2011, 03:00 AM   #2
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Is there any reason why you want an SMPS? I think an unregulated DC supply works just as well if not better under certain conditions.
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Old 8th March 2011, 03:22 AM   #3
udailey is offline udailey  United States
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I bought a couple Lambda supplies from Ebay about 3 years ago. They really sounded excellent driving my LM3886 which is of course half of a LM4780.
I am sorry but I dont know of any pcb layout specifically for switched but I also dont think you need a specific layout for switched. I am sure that I didnt need one.
Your switched will need a Plus/Minus/Ground though. Make sure you dont buy one with just Plus and 0V.
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Old 8th March 2011, 07:11 AM   #4
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http://www.national.com/ds/LM/LM4780.pdf
at page 7, Single Supply Application Circuit
isn't this the schematic for an switched supply that has only + and 0v. I'm asking this because I already have a supply with this value, and I plan to use it.

Thanks for your replies
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Old 8th March 2011, 07:52 AM   #5
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A power supply is a power supply linear or switching.
As long as it meets the power requirments it is supposed to do. jer
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Old 8th March 2011, 06:39 PM   #6
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Quote:
Originally Posted by hashwood View Post
a PCB layout for LM4780 when using a switched power supply ?
What do you expect to be different in the amp's layout, when you use a different power supply?
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Old 8th March 2011, 06:53 PM   #7
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as I said my power supply doesn't have +V, -V, and gnd, as I noticed most of the layouts are using. I only have +V and gnd.
In the datasheet the only schematic that has only +V and gnd is the one on page 7, as I said in my earlier post. Is that schematic OK, can I use it ?

http://www.national.com/ds/LM/LM4780.pdf
at page 7, Single Supply Application Circuit
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Old 8th March 2011, 08:09 PM   #8
udailey is offline udailey  United States
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Make sure to read page 18 for single supply operation. Also, since this is how an amp in a car would have to operate I am betting there is an app note about how to implement it and I also bet that in the car audio section you will find folks who have done what you are talking about already.
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Old 8th March 2011, 09:23 PM   #9
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what car ? I want to use it at home...
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