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Part Number: TPA3251
We have a stereo amplifier product with TPA3251. Driving 4 Ohms resistors works fine. When driving 4 Ohms speakers and music playback there is drop-outs in sound for about 220mS at high playback level. I added Schottky diodes on chip outputs to GND and it did a improvement, but problem still not solved. I inspected 10 pcs from MP and they all have this issue but the threshold level for drop-outs has some variations. Drop outs happen even with cold heatsink and using high end thermal paste does not solve the problem. When Schottky diodes is added the amp can output full power in 2 Ohms with one ch. driven. So it's not current limiting issue. Power supply is 36VDC and very stable, newer drops below 34V. Below is measurements of Loudspeaker Current and Voltage when music playback and a typical 4 Ohms rated speaker, (B&W 704S2) It seems that high current when Voltage is low is causing the issue. See attached. Any suggestions? Thanks. Michael
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In reply to Adam Sidelsky:
In reply to Michael Kragelund35:
Problem solved. GND power plane to chip was not optimum. Soldering wires to GND pins on chip did fix the problem.
Thanks for your support!
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