Hi,
I'm working on a Board that should hold 4 of the TPA3122's in Stereo mode to power a speaker array. (multible boards are used to get a 4x4 or even bigger array)
I have finished the layout in eagle and I have some questions.
1. Is it allowed to sum the voltage stabilization caps to one or two bigger ones when having 4 of the amps on a small board?
2. Because of the limitations of the free Eagle version i am limited in space, so the GND that connects the components farthest from the supply have only a thin connection. Is that bad? ( I thouth about using a wire to strengthen the connection)
3. The board will actually be produced by a PCB manufacturer.
Can anybody see obvious errors on the board.
DRC only gives ma some stop mask errors.
Thanks for the help.
regards
Sebastian
I'm working on a Board that should hold 4 of the TPA3122's in Stereo mode to power a speaker array. (multible boards are used to get a 4x4 or even bigger array)
I have finished the layout in eagle and I have some questions.
1. Is it allowed to sum the voltage stabilization caps to one or two bigger ones when having 4 of the amps on a small board?
2. Because of the limitations of the free Eagle version i am limited in space, so the GND that connects the components farthest from the supply have only a thin connection. Is that bad? ( I thouth about using a wire to strengthen the connection)
3. The board will actually be produced by a PCB manufacturer.
Can anybody see obvious errors on the board.
DRC only gives ma some stop mask errors.
Thanks for the help.
regards
Sebastian
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You're going to run into problems with heterodyning of the carrier frequencies through the rails with 4 chips. Even completely decoupling the power supply won't get you interference free output. You would need to have 4 separate power supplies and each amp isolated.
A better solution is to use 8x TPA3106D1 which can be used in a master/slave configuration for the oscillators. If you are limited in space, I'd go with one chip per board, jumpers for the master/slave oscillator links through twisted pair wires, use a single smaller local power supply cap, wide power traces, and a single PS board with big reservoir caps.
A better solution is to use 8x TPA3106D1 which can be used in a master/slave configuration for the oscillators. If you are limited in space, I'd go with one chip per board, jumpers for the master/slave oscillator links through twisted pair wires, use a single smaller local power supply cap, wide power traces, and a single PS board with big reservoir caps.
Two large supply caps is a bad idea IMO. You need two per IC as close to the supply pins as possible. 4x 3122 on the same board is probably a bad idea as well.
I recently finished making a layout for 4x TPA3106D1 (synced) for use in my car. Just need to find time to make the board.
I recently finished making a layout for 4x TPA3106D1 (synced) for use in my car. Just need to find time to make the board.
how strong would that interferences be?
i'm not planing on getting the maximum power/volume out of the amps and i'm using very small speakers.
If the frequency was in the audible range, you would constantly hear a tone or tones that won't go away. Do a search in this forum. There was another member who ran into this problem with two TPA3xxx parts on a board where he describes what he encountered.
Update:
Despite your warnings i built the thing....and see there. No Problems at all.
Works quite well with a simple switching power supply from a external harddrive.
So don't fear putting more than one Amp of this kind on one board.
Regards
S
Despite your warnings i built the thing....and see there. No Problems at all.
Works quite well with a simple switching power supply from a external harddrive.
An externally hosted image should be here but it was not working when we last tested it.
So don't fear putting more than one Amp of this kind on one board.
Regards
S
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