Bridge/parallel calculations??

[JDeV]

Can somebody please post formula for calculating the max. out power (at various supply voltage levels) of a bridge/parallel combination using LM4780 (for instance)? I plan to use this with either Dayton Titanic or Adire DPL 12 for active subwoofer - if there is enough power

Thanx for any help.

 

[Rob M]

Take a look at the "design guides" here:

http://www.national.com/appinfo/audio/

 

[JDeV]

Take a look at the "design guides" here:

http://www.national.com/appinfo/audio/

I looked at that earlier, they don't support the LM4780 and I am not sure what the combined (bridged/parallel) result must be.
In the BPA-200 application sheet , http://www.national.com/appinfo/audio/files/BPA-200_Application_Note.pdf , they also explain how to calulate the bridged Pmax, but not bridg/paral.

 

[peranders]

Check these especially the Excel file
http://www.national.com/an/AN/AN-1192.pdf
http://www.national.com/appinfo/audio/files/Overture_Design_Guide13.xls
http://www.national.com/appinfo/audio/files/Using_Overture_Design_Guide.pdf

 

[JDeV]

Check these
http://www.national.com/an/AN/AN-1192.pdf
http://www.national.com/appinfo/audio/files/Overture_Design_Guide13.xls
http://www.national.com/appinfo/audio/files/Using_Overture_Design_Guide.pdf

AN-1192 and PAB-200 are basically the same document, 1st one is just a later version. The design guides is the same as what Rob M suggested.

 

[peranders]

I recommend that you take a look at the Excel calculations.