I've been wanting to try a good chip-amp design, and saw that TI recently put out a new line of Class-D amps. They have MUCH better specs on paper than the older ones that you can get on ebay (TAS5630 etc..) but no boards seem to be available yet.
The part numbers are TPA3251D2 (75W into 8 ohms), and TPA3255 (150W into 8 ohms). The higher power one isn't available yet, so I'll be using the TPA3251 for now. The two amps are pin compatible so I *should* be able to drop in the higher power part when it becomes available.
A fair bit of spare time the last few weeks has gone on drawing up schematics and laying out the PCB. Off went the design files to PCBway, and today a box arrives at work with my boards! :-)
It's a 4-layer PCB as I wanted to make sure there were no compromises on power and ground tracks, and the high current outputs of the chip amp. The chip amp is on the bottom side of the board, along with all the SMD components.
I've made a heat spreader from some aluminium bar which will serve to move heat from the chip amp to the heatsink, as well as provide some spacing under the board for the other components.
Parts are on order, should receive them early next week then I can get cracking!