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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st October 2011, 06:36 AM   #11
savu is offline savu  Romania
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check the circuit that mutes the HIP.
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Old 21st October 2011, 02:38 PM   #12
Eva is offline Eva  Spain
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We know that the replaced FETs are ok, but what about their gate drive? Sometimes a resistor gets open or a diode or transistor shorted when a FET fails.

But by the sound of point 5 in post #1 it seems that the amplifier shuts down as soon as it starts to switch, this suggests an overcurrent condition (or DC condition if it is even checked), either true or just due to damaged protection circuits.

Something wrong with the PWM control loop may trip overcurrent, DC or HF protections (if they exist) as soon as the amplifier is un-muted. HIP pin 3 is gate drive enable.
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Old 21st October 2011, 10:38 PM   #13
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So, what we have now.
Bought some LM393s today and replaced all 3 of them in the amp. Now it even starts, so this replacement was not unsuccessful at all. After the first start found that at least one of the output mosfets was dead again. So soldered all 12 them out of board and put back only 4. But I've still got some new problems:

1. The amp still starts, but it draws about 2.5A already at 14V, or almost 10 Watts more than before the replacement. Those 4 output mosfets become really hot without heatsinking in few seconds.
2. It seems like internal relay switches on the load too soon, so if there is a load at the output, the amp starts to draw too much amps (much over 10A) without any sound at the output.
3. But if I wait for 2-3secs more after full start of the amp and only then connect the load, now it works better - still about the same 2.5Amps, but there is toooo much distortion at the output and almost no sound at all, when the current is still rising during the track.
4. Also there is some noise (like ticking, scratching, etc.) now coming from the power supply I think, and the higher the volume is, the louder this unlikely sound becomes.

And what could be the role of CD4013 in the amp? It is at least the last IC in DIP case that I also could replace...
Hope on your advices about what to do next.
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Old 22nd October 2011, 05:11 AM   #14
savu is offline savu  Romania
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CD4013 is a flip flop. i don't think it has something to do with the audio part.

have looked the net for the service manual of this amp but without success.
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Old 16th November 2011, 08:55 AM   #15
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One more question about the ZD1: if I have only 3.83V there should I change it? Also there are about 4.1V on pin 6 and almost zero on pin 7. All these voltages were measured without the HIP (and it is probably dead). A couple of outputs were blown, so now I only use 4 of them for tests (IRF3710).
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Old 16th November 2011, 02:18 PM   #16
Eva is offline Eva  Spain
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Note that the PWM could go through the CD4013. Audio usually goes through logic gates in class D amps.
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Old 16th November 2011, 06:22 PM   #17
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How can I check its working condition?
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