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TA2020 Overvoltage
TA2020 Overvoltage
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Old 24th March 2019, 01:25 AM   #1
DreadPirate is offline DreadPirate  United States
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Default TA2020 Overvoltage

I accidently connected an 18V DC power supply to the old Arjen Helder MKIII TA2020 amp and now there is no output. Will powering up with mute and fault pins jumpered provide the necessary reset? Text from the TA2020 datasheet seems to indicate this may be the case, but it also says powering down will effect the reset and that has not worked.

Also, I see that there are TA2020 chips still for sale on eBay, with a KOREA or CHINA stenciled chip going for $3 and even a USA chip for $16.95 (sold by Dalbani). What gives with this, any reason not to get the $3 chip if the need arises?

The chip on the Arjen Helder amp has KOREA on it.

The same $16.95 chip sold by Dalbani can be obtained for $3.20 from ALI here:

2pcs TA2020 020 package ZIP32 20W Digital Amplifier IC Audio Stereo-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

Though it looks like one buyer got a KOREA branded and was not happy.

FROM TA2020 DATASHEET:

O v e r - c u r r e n t P r o t e c t i o n
An over-current fault occurs if more than approximately 7 amps of current flows from any of the amplifier
output pins. This can occur if the speaker wires are shorted together or if one side of the speaker is
shorted to ground. An over-current fault sets an internal latch that can only be cleared if the MUTE pin is
toggled or if the part is powered down. Alternately, if the MUTE pin is connected to the FAULT pin, the
HIGH output of the FAULT pin will toggle the MUTE pin and automatically reset the fault condition.
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Last edited by DreadPirate; 24th March 2019 at 01:39 AM.
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Old 24th March 2019, 02:08 AM   #2
Bare is offline Bare  Canada
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Short answer; Yer Fooked.
TA chips (genuine ones ) stopped being available in ~2006.
Only half the die copies remain.
In actual fact.. My Guaranteed "genuine" ta 2020 by/from Arjen No less ... GRRR ..was a worthless Fake.. It crapped out within an hours use AND it sounded terrible. Circus logic ended production 14 Yrs ago .. it's over!
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Old 24th March 2019, 02:32 PM   #3
DreadPirate is offline DreadPirate  United States
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The AJ board, though well built, was among my least favorite sounding Class D amps. And I paid pretty good money, perhaps $45 for it. Will probably give a go to fixing it anyway.
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Old 27th March 2019, 06:33 PM   #4
DreadPirate is offline DreadPirate  United States
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Upon inspection, trace from power input to the storage cap has been lifted. Measure 1.2 ohm across power input (max 13.5V, but I loaded it with 18V to failure) and 1.2 and 4.5 ohm across speaker terminals. Looks like chip has been demolished. Ordered 2 TA2020 from ALI for $3.20 shipped! At $1.60 per chip, chances are good they are genuine, right? .

If profusionplc is to be believed, the genuine chips are marked USA.
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Last edited by DreadPirate; 27th March 2019 at 06:36 PM.
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Old 27th March 2019, 07:16 PM   #5
FauxFrench is offline FauxFrench  France
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Quote:
Originally Posted by DreadPirate View Post
Upon inspection, trace from power input to the storage cap has been lifted. Measure 1.2 ohm across power input (max 13.5V, but I loaded it with 18V to failure) and 1.2 and 4.5 ohm across speaker terminals. Looks like chip has been demolished. Ordered 2 TA2020 from ALI for $3.20 shipped! At $1.60 per chip, chances are good they are genuine, right? .

If profusionplc is to be believed, the genuine chips are marked USA.
Chances are good that they will play. Chances are poor that they are genuine if you mean produced during the period Tripath still existed. Chances are fair that they are produced legitimately with permission from Cirrus Logic. Chances are fair that they are produced by a Korean wafer house that also worked for Tripath in the past.
Please let us know if they work when you have done the replacement. You are not the only one to continue listening to Tripath.
Good luck.
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Old 28th March 2019, 10:49 PM   #6
nigelwright7557 is offline nigelwright7557  United Kingdom
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I am surprised 18 volts killed it as the spec says 16 volts.
Maybe it was a fake device ?
I have had troubles with fake devices blowing at the first sign of a spike on the rails.
Always buy from reputable dealers. That's not ebay or China !
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Old Yesterday, 10:27 PM   #7
DreadPirate is offline DreadPirate  United States
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I received a pair of TA2020 from China today (about $2/per) and I provide some pics. These came from the same vendor, but oddly enough, don't match! The "USA" model has the print stenciled, the one on the right or "Korea" model at least has the logo etched. The casing looks to be from different molds. I think I'm going to go with installed the etched chip.
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File Type: jpg P4250550.JPG (248.2 KB, 16 views)
File Type: jpg P4250551.JPG (301.8 KB, 16 views)
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Old Yesterday, 11:01 PM   #8
DreadPirate is offline DreadPirate  United States
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For completeness, the TA2020 that came with the Arjen kit, similar to the etched version I just received, but the font is not quite identical, the pins are gold, and the heat sink is copper. Disregard the spot on the back, that is some epoxy from another project that founds its way onto the chip. All chips weigh 13 grams.
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File Type: jpg P4250552.JPG (247.6 KB, 12 views)
File Type: jpg P4250554.JPG (251.6 KB, 5 views)
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Last edited by DreadPirate; Yesterday at 11:03 PM.
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Old Yesterday, 11:38 PM   #9
e_fortier is offline e_fortier  Canada
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TA2020 Overvoltage
Default Lepai amp

Hi

Blast from the past...bought this at least 10 years ago..these used to be popular on eBay since it had a TA2020.

BR
Eric
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