TDA7492 vs TPA3116 Tests - diyAudio
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Old 26th December 2014, 07:32 PM   #1
rcbuck is offline rcbuck  United States
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Join Date: Feb 2010
Location: Phoenix, AZ
Default TDA7492 vs TPA3116 Tests

Has anyone purchased this item?:
http://www.ebay.com/itm/360982220650?_trksid=p2059210.m2749.l2649&ssPageNa me=STRK%3AMEBIDX%3AIT#ht_3500wt_1111

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:
http://www.parts-express.com/2x50w-tda7492-class-d-amplifier-board--320-301

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:
http://www.ebay.com/itm/DC18V-24V-TPA3116-ClassD-Amplifier-Board-50W-50W-Filter-Capacitor-2-10000UF-/251413946728?pt=LH_DefaultDomain_0&hash=item3a8970 6168#ht_2780wt_1291

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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Old 26th December 2014, 07:48 PM   #2
irribeo is offline irribeo  Netherlands
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Join Date: Apr 2013
Must be the 10.000uF capacitors
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