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Class D Switching Power Amplifiers and Power D/A conversion

Tpa3251 board fault LED
Tpa3251 board fault LED
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Old 25th March 2019, 08:53 AM   #1
NeoHavic is offline NeoHavic
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Join Date: Nov 2018
Default Tpa3251 board fault LED

I bought a EAUMT-0100-3-A that has the fault LED lit up as well as no audio being output. My setup has the audio coming in as a single ended signal into a miniDSP set to high sensitivity, outputting the audio to the EAUMT-0100-3-A power amp as a balanced signal, and then output to the speakers as a single ended signal once again. The amplifier is being powered by ~29V, and is utilizing the onboard 12V header to power the miniDSP. Input 1&2 are being used, but 3 is not, and does not have the signal input wire plugged into it. The minDSP can “see” that it is getting a signal through the 2x4 Advanced plugin
software, so I know it isn’t that. Grounding the fault pin doesn’t change the status of the LED, while grounding the clip/OTW pin DOES cause the corresponding LED to light up, sonim stumpid in that front as well since the pins are open drain, active low. Any help would be SUPER appreciated! Here’s a link to the datasheet for the amp in question just to be in the safe side of someone hasn’t seen it before:
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Old 25th March 2019, 10:18 AM   #2
imbra is offline imbra  Hungary
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Join Date: May 2015
Location: Budapest
On most TPAs FAULT is lit when one of the speaker outputs are shorted. Have you tried checking for shorts?
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