|Class D Switching Power Amplifiers and Power D/A conversion|
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|26th December 2014, 07:32 PM||#1|
Join Date: Feb 2010
Location: Phoenix, AZ
TDA7492 vs TPA3116 Tests
Has anyone purchased this item?:
I purchased it and am disappointed in results obtained in testing. I used a 24 volt power supply, 6 ohm resistive load, and 1kHz sine wave input signal. The most voltage I could get out before clipping was 11.5 volts. This translates to only 22 watts.
I pulled the heatsink and right beside the chip the silk screen says TDA7498. However, the chip must actually be a TDA7492 chip. If I increase the power supply voltage to 29 volts the chip goes into shut down. This is the shut down voltage for the TDA7492 part.
I have this board from Parts Express:
With the same test conditions listed above, I can get 14.3 volts out before the amplifier goes into clipping. This translates to 34 watts which is much better than the board above.
As a comparison, I have this board:
With the same test conditions, I can get 15 volts out before the amplifier goes into clipping. This translates to 37.5 watts which closely matches the power out versus power supply voltage curves for the TPA3116 part.
In all tests, I am only driving one channel. And I let the resistive load cool down between tests.
I have two questions:
1) Any guess as to why the first board will only put out 22 watts and the second board with the same part will put out 34 watts?
2) Is the TPA3116 part much better than the TDA7492 part? It will put out almost 3 extra watts under the same test conditions.
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