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Old 8th February 2013, 09:19 PM   #1
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Default TAS5630b PCB order for you ;-)

Hello!

I designed a tas5630b class D pcb and want to ask if there's somebody interested in some pcb's?

Eagle files and a png image are attached.

Some information about the board:

- the input stage is made with a pair of DRV134 differential drivers. If you don't want to use them just use the IC sockets for a small pcb with your own input buffer stage.

- there is a input relays which closes if the tas is ready.

- there is a attiny13 C for resetting the tas. It's just a feature so if you don't want it just don't use it. Instead of the C you can plug in a simple button for resetting.

- the status signals are opto coupled. I need it for my hole system, it's also just a feature and not necessary for operation. If you want to use it I can give you further information about it.

- Output inductors are coilcraft ser2923 but you can also solder in self made inductors.

- you can use smaller output capacitors instead of the big ones with rm 27,5mm. I added vias with rm 7,5mm so you can use them if you like the smaller ones better.

I'm from germany but I can ship worldwide.

The price depends on how many boards are ordered. I need two for my self, if we order 10pc. the price is about 25 euro ( 33 USD ). The more I can order the cheaper it gets! Shipping depends on the country - I will use the cheapest way.

PCB is made with 70m copper and gold finish for the pads.

best regards
Bernhard Waechter
Attached Images
File Type: png tas5630b.png (310.5 KB, 388 views)
Attached Files
File Type: zip tas5630b_eagle.zip (124.8 KB, 83 views)
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Old 8th February 2013, 09:42 PM   #2
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Nice board. Why not a better input device like OPA1632/THS4130?

I have 15pcs of TAS5630 if you need them (not TAS5630B).
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Old 8th February 2013, 09:49 PM   #3
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Because I already have a input buffer with opa4227 in my system, I just need a differential stage and it's easier with the drv134 and more flexible because if I don't like the drv134 I can add another buffer by plugging in a small pcb in the ic socket. All the signals I need for it are available on the socket.

Thanks for the offer, maybe I will need them later. I actually have three pcs. of tas5630b.

Last edited by mantabernd; 8th February 2013 at 09:53 PM.
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Old 9th February 2013, 08:15 AM   #4
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I actually saw that the input of the tas5630 must not be negative, the input voltage range is -0.3 to +7V.

I want to use the drv134 with symmetrical power supply +/-5V, but if I do so the signal will have about -4 to +4V and this will destroy the tas, right?

So I have to use a single voltage supply for the input stage , correctly? I looked in the datasheet but neither the drv134 or the opa1632 can be powered by a single voltage supply. TI does it on their evm board for the tas, I'm a bit confused about it...

regards
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Old 9th February 2013, 09:43 AM   #5
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No, in the datasheet they "only" don't have the specs published for single-supply operation. But as far as i know, you can use virtually any opamp with a single-supply, as long as the "ground" (1/2-supply) reference is where it should be.

If you'll look (more carefully) in the EVM schematics you'll see that:
1) there are 10uF coupling caps right on the TAS5630 input pins
2) the Vocm pins of the OPA1632 are left floating (and if i remember correctly, they self-bias internally to the mid-point between whatever voltages they have at the V+ and V- pins) - see page 8 of the datasheet: http://www.ti.com/lit/ds/sbos286b/sbos286b.pdf
3) the inputs to the OPA1632's also have 10uF input caps


This might (also) come in handy:
http://www.ti.com/lit/an/sloa058/sloa058.pdf
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Old 9th February 2013, 09:54 AM   #6
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Thanks for the fast reply

So I definitly have to change my input buffer for getting the tas running propely.

I think I will use the OPA1632 as shown in the evm board.
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Old 9th February 2013, 10:02 AM   #7
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You don't need to - as long as you use coupling caps between the DRV134 outputs and the TAS5630 inputs, you should be fine

The 5V input swing means the input voltage to the TAS can be 5Vpp max.
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Old 9th February 2013, 04:28 PM   #8
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Update: I changed the input stage to OPA1632. You can now plug in single ended signal or diff. signal, you just have to change a smd jumper.

I'd like to order the pcb's next week so let me know if you want some.
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Old 9th February 2013, 05:45 PM   #9
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I would be in, but the last thing I need in life is another amp.

I have like a bazillion OPA1632 here if you need any of those as well.
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Old 10th February 2013, 12:33 AM   #10
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A bazillion? That almost sounds like you're uber-eager to get rid of them for free
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