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Class D Switching Power Amplifiers and Power D/A conversion

mono tpa3116 red aliexpress
mono tpa3116 red aliexpress
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Old 18th February 2017, 01:33 PM   #1
basreflex is offline basreflex  Spain
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Default mono tpa3116 red aliexpress

bought two of these mono boards red pcb and found they were designed wrong. the sync pin is programmed as input (slave operation) and connected to ground. the result is a too low oscillation frequency below 200khz, distortion, excessive current drain.
I changed the programming resistors to set it as master and lifted the sync pin (16) away from ground. luckily this pin is ad the edge of the package so it can be lifted using a pointed tweezer and a soldering iron.
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Old 5th March 2017, 04:11 PM   #2
silverprout is offline silverprout  France
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Quote:
Originally Posted by basreflex View Post
bought two of these mono boards red pcb and found they were designed wrong. the sync pin is programmed as input (slave operation) and connected to ground. the result is a too low oscillation frequency below 200khz, distortion, excessive current drain.
I changed the programming resistors to set it as master and lifted the sync pin (16) away from ground. luckily this pin is ad the edge of the package so it can be lifted using a pointed tweezer and a soldering iron.
Also find the same problem on these boards.
And after removing all components, i also find a wrong capacitor on the EMI CRC snubber (100nF instead of 1nF).

All my ebay amplifier are gone to the bin...
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Old 5th March 2017, 04:30 PM   #3
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Old 5th March 2017, 05:54 PM   #4
basreflex is offline basreflex  Spain
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after the fix my boards worked fine ..
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Old 5th March 2017, 06:11 PM   #5
silverprout is offline silverprout  France
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You are lucky, or i'm unlucky... i don't know

But change all caps is more expensive than an new amplifier and harmful for the performances (replacing SMD by Through-Hole)
And i don't know where i can find a reliable provider.
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Old 5th March 2017, 06:46 PM   #6
basreflex is offline basreflex  Spain
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built my first tube amp 54 years ago, its a bit more than luck ..
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Old 5th March 2017, 06:56 PM   #7
silverprout is offline silverprout  France
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built my first tube amp 54 years ago, its a bit more than luck ..
So, no luck here, it's only experience
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