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Class D Switching Power Amplifiers and Power D/A conversion

Tiny TAS5558 +TAS5624 "Power_DAC"+SMPS
Tiny TAS5558 +TAS5624 "Power_DAC"+SMPS
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Old 25th March 2018, 04:15 PM   #1
IVX is offline IVX  Ukraine
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Default Tiny TAS5558 +TAS5624 "Power_DAC"+SMPS

I've noticed tiny class D amps on taobao and ebay are getting popular, however, all(ok, most) of them had external SMPS, and usually it's an awful industrial/LED or power brick for a laptop. I like a challenge, so I decided to design the same sized amp but with a good quality "audio grade" SMPS onboard.
Specs roughly: PCBA 139x100x29mm, 2x125W@1kHz@THD+N=1%, 2x115W@20Hz@THD+N=1%, 1/2 max Power THD+N = .04%, S/N <-105db, regulated LLC SMPS 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 probably frequency response calibration for particular speaker) Ti CC2540. Due to very light case-heatsink, the amp running quite warm, and actually off by OTP during couple minutes of 125W+125W 1kHz sine at 4ohm load, however, amp never off on a music and 4ohm speaker load. So it is the compromise to meet a high-density power in a tiny case for real world

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Old 25th March 2018, 05:41 PM   #2
irs20957 is offline irs20957  Russian Federation
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IVX, good work Commercial project?
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Old 25th March 2018, 08:25 PM   #3
chermann is offline chermann  Austria
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...fine
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Old 25th March 2018, 08:57 PM   #4
voltwide is online now voltwide  Ireland
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looks professional to me, even the mains emi-filter looks appropriate
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Old 26th March 2018, 01:05 AM   #5
IVX is offline IVX  Ukraine
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Such a tight layout is too difficult without mechanical cad, at least for such stupid nerd as I'm(can u see ugly heatsink edge?). So let me advise you, guys, pay more attention to Solidworks/Autocad/Freecad etc, whatever commercial project or not.

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Last edited by IVX; 26th March 2018 at 01:08 AM.
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Old 26th March 2018, 06:28 AM   #6
irs20957 is offline irs20957  Russian Federation
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Show bottom side?
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Old 26th March 2018, 07:59 AM   #7
IVX is offline IVX  Ukraine
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bottom side:
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Old 26th March 2018, 08:04 AM   #8
2wice is offline 2wice  South Africa
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Show the price side?
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Old 26th March 2018, 08:07 AM   #9
chermann is offline chermann  Austria
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Originally Posted by 2wice View Post
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Old 26th March 2018, 09:43 AM   #10
IVX is offline IVX  Ukraine
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BOM is not really cheap yet, let's count together:
CM6631A for $5.5(really too expensive for 8051 junk with external flash!), and $3.5 for TAS5558(it is quite ok if 8ch involved but for only stereo, it's expensive too), TAS5624 $.78, CC2540 $.9, stm8s003f3 $.17, SMPS mosfets $.8 for a pair, irs2101s $.3, 4 coils Sagami 7g14c $1.6 for all, LLC and trafo maybe $1.2, aluminum caps $2 for all, PCB 2layers 2oz $1, +$1.5 for all others I guess. Total: about $20 for PCBA.
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