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 µC for resetting the tas. It's just a feature so if you don't want it just don't use it. Instead of the µC 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 70µm copper and gold finish for the pads.
best regards
Bernhard Waechter
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 µC for resetting the tas. It's just a feature so if you don't want it just don't use it. Instead of the µC 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 70µm copper and gold finish for the pads.
best regards
Bernhard Waechter
Attachments
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.
Thanks for the offer, maybe I will need them later. I actually have three pcs. of tas5630b.
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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
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
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
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
I've also designed a PCB for the DKD-version of the TAS5630. Single-sided (for simple&easy DIY-ing 
), so i'm not expecting miracles performance-wise, but i'd like to think i took one huge step forward in practicality: i figured i'd put all the SMD's on the bottom of the board, and all the through-hole parts would remain "normally", on the top of the board - that way, no heatsink space-restrictions
The EVM schematic gave me some nice ideas, regarding the OTW pin "switching on" the fan, and the on-board HV-to-15v regulator.
I'm planning on using some "recycled" Pentium 3 coolers Gonna drill a couple holes along the middle-channel (where the steel clip used to be) - the pcb holes are lined up with the middle of the chip. And it should all fit on half a Eurocard (~80x100mm).
The interesting part will be winding the output inductors (this *IS* DIY-audio, isn't it?) - i want to use a single toroidal core for each (AD-modulated) full-bridge. I should put together my LC-meter already...
), so i'm not expecting miracles performance-wise, but i'd like to think i took one huge step forward in practicality: i figured i'd put all the SMD's on the bottom of the board, and all the through-hole parts would remain "normally", on the top of the board - that way, no heatsink space-restrictions The EVM schematic gave me some nice ideas, regarding the OTW pin "switching on" the fan, and the on-board HV-to-15v regulator.
I'm planning on using some "recycled" Pentium 3 coolers
Gonna drill a couple holes along the middle-channel (where the steel clip used to be) - the pcb holes are lined up with the middle of the chip. And it should all fit on half a Eurocard (~80x100mm).The interesting part will be winding the output inductors (this *IS* DIY-audio, isn't it?
) - i want to use a single toroidal core for each (AD-modulated) full-bridge. I should put together my LC-meter already...
You want me to throw some of those in the package as well.
The interesting part will be winding the output inductors (this *IS* DIY-audio, isn't it?
I've always wanted to try this too (if we are talking the same thing); like the output inductors on the ICEPower boards. I've been tempted to buy some Ferroxcube gapped ferrite toroids to try it with.
Only if they're "burning a hole in your pocket", as it were I've (still) got 5 samples from TI from a couple years ago, that i haven't even unsealed - (higher-priority) stuff just kept getting in the way...
I'm not sure how the ICEPower output inductors are, but i figured, since the outputs of the two halves of one bridge are basically "mirrored", they shouldn't really "clash" on/in the same core. It would be one hell of a space-saver, even if one had to use slightly bigger cores It'd be real handy to know how to calculate the core loss in that case, though
I've (still) got 5 samples from TI from a couple years ago, that i haven't even unsealed - (higher-priority) stuff just kept getting in the way...I'm not sure how the ICEPower output inductors are, but i figured, since the outputs of the two halves of one bridge are basically "mirrored", they shouldn't really "clash" on/in the same core. It would be one hell of a space-saver, even if one had to use slightly bigger cores
It'd be real handy to know how to calculate the core loss in that case, though
For what it's worth, i had started a thread here "a while" ago, exactly regarding this matter: http://www.diyaudio.com/forums/class-d/168308-coupled-output-inductor-btl.html
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