Other Parts Discussed in Thread: TPA3128D2
Hello,
We are currently working on a design for an amplifier using TPA3116 to be powered of nominal 12V with an internal boost converter to generate 24V on demand (possibly using signal envelope tracking) if input signal demands require this. TI does have lovely reference designs for this.
However we already use and deploy suitable integrated step-up converter solutions, where one pair of converters in parallel would in principle scale sufficiently to deliver close to rated power. To us design reuse and economics of scale matter a good deal here, so we would like to employ this scheme in preference over a single higher power converter.
Obviously directly paralleling power supplies (even synchronized ones) is asking for trouble with current sharing.
However, it seems that each channels PVCC connections are pinned out separately (possibly even each half bridge - counting the pins). In this case we could use one of our existing solutions to power one channel, giving us the desired outcome.
Can TI confirm that the PVCC Pins are separated and may be connected to separate supplies?
Additionally, anecdotal evidence exists that extra filtering for the AVCC pin improves performance.
Are there any voltage difference limits between each channels PVCC pins and the AVCC Pin that must be respected, or are we reasonably free to set AVCC and PVCC Left and PVCC Right separately as long as maximum voltage limits are respected?
So could we (for arguments sake) supply AVCC with a well filtered 12V Supply and have the PVCC Pins at any value between (say) 9V and 26V depending on demand by the signal?
Or do we need to make sure (say back to back diodes) that the various supplies track closely?
Thank you for your consideration, T