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Mmats pr audio D3 series Rev 3, help needed to identify blown parts
Mmats pr audio D3 series Rev 3, help needed to identify blown parts
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Old 10th October 2018, 03:48 PM   #1
imraneesa is offline imraneesa
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Default Mmats pr audio D3 series Rev 3, help needed to identify blown parts

hi,

The above mentioned subject amplifier had blown power supply mosfets. Some of the resistors near to MIC4424 chip were blown also. If anybody can assist me finding the values will be highly appreciated.I am attaching pictures. Thank you.

Best Regards
Imran
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File Type: jpg 20181010_113108.jpg (986.2 KB, 68 views)
File Type: jpg 20181010_112923.jpg (993.5 KB, 62 views)
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Old 10th October 2018, 04:14 PM   #2
Perry Babin is offline Perry Babin  United States
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Are the ones for the other drive circuit burned as well?
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Old 10th October 2018, 04:20 PM   #3
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
Are the ones for the other drive circuit burned as well?
Yes other side also in a same condition. actually inductor short and the outputs and powersupply fets gone, i have to remove all to see how many survived. i dont know if the customer will like to fix this amp, it will cost so much to fix. finding inductor is also another problem.
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File Type: jpg 20181010_121233.jpg (976.6 KB, 62 views)
File Type: jpg 20181010_121244.jpg (749.9 KB, 59 views)
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Old 10th October 2018, 04:24 PM   #4
Perry Babin is offline Perry Babin  United States
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The inductor can be re-wound.

In a similar amp the resistors are 24.9 ohms but in this amp, the diodes are not used. In your amp, the resistor may have been higher. You can probably go as high as 100 ohms. Double-check operation by forcing the duty cycle to as high as it will go and confirm that the current draw doesn't increase when the duty cycle increases.

Maybe someone else will have more definitive information.
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Old 27th November 2018, 02:48 PM   #5
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
The inductor can be re-wound.

In a similar amp the resistors are 24.9 ohms but in this amp, the diodes are not used. In your amp, the resistor may have been higher. You can probably go as high as 100 ohms. Double-check operation by forcing the duty cycle to as high as it will go and confirm that the current draw doesn't increase when the duty cycle increases.

Maybe someone else will have more definitive information.
how to force the duty cycle of the amp?
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Old 27th November 2018, 03:24 PM   #6
Perry Babin is offline Perry Babin  United States
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Reduce the 12v supply voltage and the PS controller will try to compensate by increasing the duty cycle.
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Old 27th November 2018, 03:57 PM   #7
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
Reduce the 12v supply voltage and the PS controller will try to compensate by increasing the duty cycle.
100ohms looking stable.
I am unable to get FB4710, is there any alternative that i can use for this amp?
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Old 27th November 2018, 04:07 PM   #8
Perry Babin is offline Perry Babin  United States
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I don't have a reliable sub. In the MMATS amps that use the 4080 I use the IRF3710Z but this is a different design. There may be a better option for this amp.
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Old 27th November 2018, 04:20 PM   #9
imraneesa is offline imraneesa
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Quote:
Originally Posted by Perry Babin View Post
I don't have a reliable sub. In the MMATS amps that use the 4080 I use the IRF3710Z but this is a different design. There may be a better option for this amp.
This one uses Class D IC IR21844s.
I am getting trouble winding the coil. it is overlapping and i cant do it so tight to touch the core. i am attaching the picture. please let me know if this will work.
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File Type: jpg 20181127_131333.jpg (865.6 KB, 22 views)
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Old 27th November 2018, 04:23 PM   #10
Perry Babin is offline Perry Babin  United States
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It will be OK. Make sure that the windings are evenly distributed.
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