Super Xiao 2x125W Power_DAC+SMPS PCBA 139x100x29mm

iWoofer

Ti Pure Path TAS5558 +TAS5624 "Power_DAC"+ especially designed for audio purpose LLC SMPS PCBA 139x100x29mm
2x125W@1kHz@THD+N=1%, 2x115W@20Hz@THD+N=1%, 1/2 max Power THD+N = .04%, S/N <-105db, SMPS regulated LLC with frequency shuffling 230VAC/110VAC. USB high resolution audio input CM6631A, BT stream I2S input(not ready yet), System control and BLE smartphone control(IOS/Android apps are not ready yet but I hope about 30 parametric EQ + LPF/HPF 2-4order, and frequency response calibration for particular speaker) Ti CC2540.

^7C2E7898B5C2544FED7EA0A70D1BF5898416EAE3C2BD8C1DBE^pimgpsh_fullsize_distr.jpg

iWoofer

I've noticed a tiny class D amps on taobao and ebay is getting popular, however, all of them had external SMPS and usually awful industrial/LED or power brick for a laptop. I like a challenge, so I decided to design the same size amp but with a good quality audio grade SMPS onboard. What do you think, how high current should provide audio-amp SMPS to get 2x115W@20Hz@4ohm? Let's calculate a little. 4ohm/2ch =2ohm load equivalent, 20Hz means 25mS peaks of current, so for 30.5V rails, we need >15A (or a lot of uF capacitors but we have no room for that), or about 500W SMPS output power for short terms. I want to show you typical external SMPS box what I saw on taobao together with the second box as class D amp "2x300W", 423RMB for both. The SMPS is probably LED or telecom type for 48VDC and 7.5A max current. Now you can calculate without my help the real power of such amp+SMPS, and it is far-far from 2x300W ;) Yes, it is funny but 20Hz power expected only 28W, 11x times less than promised + safety problems and for sure EMC too.. Variant with power-brick for 55RMB will be even worse. So, the power supply of the audio amp is same important as the amp itself.

我已经注意到在淘宝上有一个小D类放大器，eBay越来越受欢迎，但是，他们都有外部SMPS，通常用于笔记本电脑的工业/ LED或功率砖很糟糕。我喜欢挑战，所以我决定设计相同尺寸的功放，但是在板上安装了高质量的音频级SMPS。你怎么看，多大的电流应该提供音频放大器SMPS以获得2x115W @ 20Hz @ 4ohm？让我们计算一下。 4ohm / 2ch = 2ohm负载等效，20Hz表示25mS峰值电流，因此对于30.5V电压轨，我们需要大于15A（或许多uF电容，但我们没有空间），或短时间大约500W SMPS输出功率。我想向您展示我在淘宝上看到的典型外部SMPS盒，以及第二个盒子的D类放大器“2x300W”，两者均为423RMB。 SMPS可能是LED或电信类型，用于48VDC和7.5A最大电流。现在你可以在没有我帮忙的情况下计算这种放大器+ SMPS的实际功率，而且它离2×300W差不多;）是的，这很有趣，但20Hz功率预计只有28W，比所承诺的+安全问题低11倍，太多了。55元的电力砖变种会更糟。所以，音频放大器的电源与放大器本身一样重要。


2018-03-25_19-29-39.jpg

samjazz

期待你的System control and BLE smartphone control(IOS/Android apps are not ready yet but I hope about 30 parametric EQ + LPF/HPF 2-4order, and frequency response calibration for particular speaker) Ti CC2540

iWoofer

BT streaming first, and next will play around smartphone control.
http://www.diyaudio.com/forums/a ... -03-26_21-31-20-png

wh812942

外国盆友的？？俄罗斯的？？

iWoofer

wh812942 http://bbs.hifidiy.net/forum.php?mod=viewthread&tid=1280928

samjazz

iWoofer 发表于 2018-3-28 13:05
BT streaming first, and next will play around smartphone control.
http://www.diyaudio.com/forums/at ...

N年没去diyaudio了，用户名密码都忘记了，所以看不了你的图片

iWoofer

https://yadi.sk/d/PeK9JW623TrqoK

iWoofer

ordered on taobao:19x30mm FR4=1mm, 2 layers, 1oz, 10pcs 30RMB, ready during 5 days. I think impossible to get cheaper, right?

litguy

iWoofer 发表于 2018-3-29 10:47
ordered on taobao:19x30mm FR4=1mm, 2 layers, 1oz, 10pcs 30RMB, ready during 5 days. I think impossib ...

yes，very cheap

iWoofer

aha, however, they mixed up last time 2oz vs 1oz, so I threw out the PCB and few parts(TAS5558 as well) of this amp, after I noticed it is 1oz..

samjazz

嘉立创10*10cm￥50/10pcs，或者￥45/5pcs，你应该知道吧？我如果不赶时间，一般都是拼板回来自己割开，就象下面其中就有你提供的iWoofer板子

samjazz

iWoofer 发表于 2018-3-29 09:37
https://yadi.sk/d/PeK9JW623TrqoK

等待你对BTM625蓝牙音质的报告，考虑是否做对TWS有源音箱来玩一下。

iWoofer

samjazz, don't forget, my cc2540 PCB layout and especially antenna requires 1mm FR4 and 1oz copper. For the power/class D PCB 2oz is better. Actually if you'll use 1mm FR4 and 2oz copper would be ok.
PS: as I see your big one PCB is irs2093 with 4xTO220 mosfets? Oh man, that layout so awful, I don't believe if it may work right ever.. You need big solid GND polygon on top, without it you'll just spend time and money. Trust me.

samjazz

iWoofer 发表于 2018-3-30 10:54
samjazz, don't forget, my cc2540 PCB layout and especially antenna requires 1mm FR4 and 1oz copper.  ...

关于天线，谢谢你的提醒。
PS：关于那个大板，是1月时赶拼板（为了免费）打样，赶时间画的，这只是一个实验板，目的是验证一下这个IC及几种驱动电路的不同。你说的地平面在底层。这板其实已经做好很久了，这个图片只是临时拼板给你看的，实际上今天画好的一个板会与图中另外的两个小板一起拼板打样。无论如何，谢谢你的指教。

iWoofer

https://yadi.sk/i/VY5gd9uO3TwFLT

iWoofer

And finally the new version of H-Fi TOY! Now even smaller 127x100mm but more expensive 4 layers PCB. What's new: TAS5624(closed loop power stage i.e. with noise-shaper inside) replaced by TAS5342(open loop power stage with custom noise shaper as additional small PCB). The goal is two modes digital amplifier with the switch Open/Closed. The open loop mode stands zero feedback and quite high THD+N(.1% at 50W) but some audiophiles would prefer it doe to pleasant sound. Closed loop mode uses additional small PCB 45x25mm with noise-shaper (loop filter with very fast Opamp) THD+N .005% @ 50W. Both modes could be switched online by iPhone/Android app.

最后是新版H-Fi TOY！ 现在更小的127x100mm但更贵的4层PCB。 新增功能：TAS5624（内置噪声整形器的闭环功率级）由TAS5342（带定制噪声整形器作为附加小型PCB的开环功率级）取代。 目标是开关打开/关闭的两种模式数字放大器。 开环模式代表零反馈，THD + N相当高（50W时为0.1％），但一些发烧友会喜欢它的悦耳声音。 闭环模式使用额外的小型PCB 45x25mm与噪声整形器（环路滤波器，运算速度非常快），THD + N .005％@ 50W。 这两种模式都可以通过iPhone / Android应用程序在线切换。

iWoofer

And finally the new version of H-Fi TOY! Now even smaller 127x100mm but more expensive 4 layers PCB. What's new: TAS5624(closed loop power stage i.e. with noise-shaper inside) replaced by TAS5342(open loop power stage with custom noise shaper as additional small PCB). The goal is two modes digital amplifier with the switch Open/Closed. The open loop mode stands zero feedback and quite high THD+N(.1% at 50W) but some audiophiles would prefer it doe to pleasant sound. Closed loop mode uses additional small PCB 45x25mm with noise-shaper (loop filter with very fast Opamp) THD+N .005% @ 50W. Both modes could be switched online by iPhone/Android app.

最后是新版H-Fi TOY！ 现在更小的127x100mm但更贵的4层PCB。 新增功能：TAS5624（内置噪声整形器的闭环功率级）由TAS5342（带定制噪声整形器作为附加小型PCB的开环功率级）取代。 目标是开关打开/关闭的两种模式数字放大器。 开环模式代表零反馈，THD + N相当高（50W时为0.1％），但一些发烧友会喜欢它的悦耳声音。 闭环模式使用额外的小型PCB 45x25mm与噪声整形器（环路滤波器，运算速度非常快），THD + N .005％@ 50W。 这两种模式都可以通过iPhone / Android应用程序在线切换。

iWoofer

And finally the new version of H-Fi TOY! Now even smaller 127x100mm but more expensive 4 layers PCB. What's new: TAS5624(closed loop power stage i.e. with noise-shaper inside) replaced by TAS5342(open loop power stage with custom noise shaper as additional small PCB). The goal is two modes digital amplifier with the switch Open/Closed. The open loop mode stands zero feedback and quite high THD+N(.1% at 50W) but some audiophiles would prefer it doe to pleasant sound. Closed loop mode uses additional small PCB 45x25mm with noise-shaper (loop filter with very fast Opamp) THD+N .005% @ 50W. Both modes could be switched online by iPhone/Android app.

最后是新版H-Fi TOY！ 现在更小的127x100mm但更贵的4层PCB。 新增功能：TAS5624（内置噪声整形器的闭环功率级）由TAS5342（带定制噪声整形器作为附加小型PCB的开环功率级）取代。 目标是开关打开/关闭的两种模式数字放大器。 开环模式代表零反馈，THD + N相当高（50W时为0.1％），但一些发烧友会喜欢它的悦耳声音。 闭环模式使用额外的小型PCB 45x25mm与噪声整形器（环路滤波器，运算速度非常快），THD + N .005％@ 50W。 这两种模式都可以通过iPhone / Android应用程序在线切换。

iWoofer

And finally the new version of H-Fi TOY! Now even smaller 127x100mm but more expensive 4 layers PCB. What's new: TAS5624(closed loop power stage i.e. with noise-shaper inside) replaced by TAS5342(open loop power stage with custom noise shaper as additional small PCB). The goal is two modes digital amplifier with the switch Open/Closed. The open loop mode stands zero feedback and quite high THD+N(.1% at 50W) but some audiophiles would prefer it doe to pleasant sound. Closed loop mode uses additional small PCB 45x25mm with noise-shaper (loop filter with very fast Opamp) THD+N .005% @ 50W. Both modes could be switched online by iPhone/Android app.

最后是新版H-Fi TOY！ 现在更小的127x100mm但更贵的4层PCB。 新增功能：TAS5624（内置噪声整形器的闭环功率级）由TAS5342（带定制噪声整形器作为附加小型PCB的开环功率级）取代。 目标是开关打开/关闭的两种模式数字放大器。 开环模式代表零反馈，THD + N相当高（50W时为0.1％），但一些发烧友会喜欢它的悦耳声音。 闭环模式使用额外的小型PCB 45x25mm与噪声整形器（环路滤波器，运算速度非常快），THD + N .005％@ 50W。 这两种模式都可以通过iPhone / Android应用程序在线切换。