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Class D Switching Power Amplifiers and Power D/A conversion

summing two single ended inputs from DACs to TPA2011D1
summing two single ended inputs from DACs to TPA2011D1
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Old 19th September 2019, 10:13 PM   #1
Canobi is offline Canobi  United Kingdom
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Join Date: Sep 2019
Location: Nesscliffe, Shrewsbury, Shropshire
Default summing two single ended inputs from DACs to TPA2011D1

Hi folks, new member here


I'm somewhat Dysnumeric which makes electronics hard going at times but my passion for the subject is enough to keep me going until I get things right, though there are times when I have to seek assistance.

In this case, I am very near the and of a rather long road designing myself an fx system for my other hobby, which is making custom lightsabers. Though to date, they have been nothing more than torches with delusions of grandeur, which is what I'm hoping the fx system will rectify.

Despite my best efforts, I just can't code for toffee, so my mission has been to design an equivalent using analogue circuits alone, while trying to make it as feature rich as I could.

The system utilises two audio playback modules called the WT588D, which sport DAC outputs and I want to hook the outputs up to a TPA2011D1 but I am finding the information in the datasheet hard to understand, so I could use a little help with working out the values required for summing them as two single ended inputs, as per the example diagram from the datasheet shows below:
Click the image to open in full size.


This is my first amplifier build as I normally use little DIY amp modules but the ones I really liked have been discontinued, so I'm going all in and attempting to integrate an amp into the system.

I've posted a pic of my schematic below but resizing it seems to have effected the quality a fair bit despite my efforts to clean it up, so I've also posted a link to download a high res PDF of it from my dropbox. It's only A4 but the file was too large to attach in the usual manner, though I did manage to attach the datasheet for the TPA2011D1.

Click the image to open in full size.


Schematic PDF:
Dropbox - Link not found
Attached Files
File Type: pdf TPA2011D1 3.2-W Mono Filter-Free Class-D Audio.pdf (1.27 MB, 1 views)
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Old 19th September 2019, 11:10 PM   #2
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
Location: The mountains, calm and quiet.
Rp should be minimum 15K (section 7.3 of the DataSheet (DS)). We use 18K.
RI1 and RI2 should in parallel have the same value as Rp. Thus RI1=RI2=36K.
CI1 and CI2 should be designed for a lower cut-off frequency around 5Hz together with each 36K resistor. 1uF gives a cut-off frequency of 4.4Hz. Hence, CI1=CI2=1uF.
That was it?

Good luck with the project!

Nesscliffe, a quiet part of England.

Last edited by FauxFrench; 19th September 2019 at 11:25 PM.
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Old 20th September 2019, 06:38 PM   #3
Canobi is offline Canobi  United Kingdom
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Join Date: Sep 2019
Location: Nesscliffe, Shrewsbury, Shropshire
Thank you, your most kind good sir



It is most frustrating when it's simple things like that evade me, so I very much appreciate you explanation and assistance.
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Old 21st September 2019, 09:56 AM   #4
Canobi is offline Canobi  United Kingdom
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Join Date: Sep 2019
Location: Nesscliffe, Shrewsbury, Shropshire
Quote:
Originally Posted by Canobi View Post
Thank you, your most kind good sir



It is most frustrating when simple things like that evade me, so I very much appreciate you explanation and assistance.
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