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Class D Switching Power Amplifiers and Power D/A conversion

TDA7498E don't produce any sound (red Amplifier module)
TDA7498E don't produce any sound (red Amplifier module)
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Old 15th May 2020, 12:13 AM   #11
Jorgesilva is offline Jorgesilva  Portugal
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It's possible use the schottky diode SMD SS86?
It's very similiar, but only rated for 8A.
Can you give me a help dear "Mooly"?
My knowledge is not to much about this.

Best regards.
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Old 15th May 2020, 06:17 AM   #12
manojtm is offline manojtm  India
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Hi,
your photo not clear, anyhow I think the diode placed in supply rail (supply reverse protect).OR if it is in speaker line (clamp diode)don't worry about that, not necessary it will work without clamp diode.
15min. run means some other component was wrong.

Regards
MANOJ

Last edited by manojtm; 15th May 2020 at 06:22 AM.
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Old 15th May 2020, 06:31 AM   #13
manojtm is offline manojtm  India
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Hi,

check PIN 20 & PIN 21= 3V if yes then replace 10uF capacitor (SMD) connected in PIN 29 to GND

Regards
MANOJ
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Old 15th May 2020, 09:51 AM   #14
Mooly is offline Mooly  United Kingdom
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TDA7498E don't produce any sound (red Amplifier module)
Quote:
Originally Posted by Jorgesilva View Post
It's possible use the schottky diode SMD SS86?
It's very similiar, but only rated for 8A.
Can you give me a help dear "Mooly"?
My knowledge is not to much about this.

Best regards.
Ideally we need to see a circuit diagram to see how it is used. If you can fit any kind of suitably rated part as a quick test then I would do so rather than trying to source the exact part only to find you have other issues with the board.

Quote:
Originally Posted by manojtm View Post
Hi,
your photo not clear, anyhow I think the diode placed in supply rail (supply reverse protect).OR if it is in speaker line (clamp diode)don't worry about that, not necessary it will work without clamp diode.
15min. run means some other component was wrong.

Regards
MANOJ
As MANOJ says, if (and we are not sure but if... )this is all the diode does then its not required for testing the board. It should all work without it.

You would need to verify what the diode does first though.
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Old 15th May 2020, 11:46 AM   #15
russc is offline russc  England
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Why not contact seller for a replacement board?
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Old 15th May 2020, 01:06 PM   #16
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
Hi,

check PIN 20 & PIN 21= 3V if yes then replace 10uF capacitor (SMD) connected in PIN 29 to GND

Regards
MANOJ
How can i check this PIN 20 & PIN 21?
I see other amplifier board TDA7498E and all have this schottky diode but when i receive my amplifier board this schottky is missed.

Best regards.

Last edited by Jorgesilva; 15th May 2020 at 01:19 PM.
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Old 15th May 2020, 01:15 PM   #17
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by Mooly View Post
Ideally we need to see a circuit diagram to see how it is used. If you can fit any kind of suitably rated part as a quick test then I would do so rather than trying to source the exact part only to find you have other issues with the board.



As MANOJ says, if (and we are not sure but if... )this is all the diode does then its not required for testing the board. It should all work without it.

You would need to verify what the diode does first though.
You can see on the picture the circuit diagram from datasheet for TDA7498E.
I don't understand to much reading the circuit diagram, can you help me?
Latter i will post a new picture of the board with better quality.

Best regards.
Attached Images
File Type: png Screenshot_2020-05-15-14-08-38.png (247.0 KB, 31 views)

Last edited by Jorgesilva; 15th May 2020 at 01:21 PM.
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Old 15th May 2020, 01:18 PM   #18
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by russc View Post
Why not contact seller for a replacement board?
I already contact the seller and he will resend me a replacement board but i don't need to send this one.
If i can fix that, it's nice for me
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Old 15th May 2020, 01:36 PM   #19
Mooly is offline Mooly  United Kingdom
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TDA7498E don't produce any sound (red Amplifier module)
Quote:
Originally Posted by Jorgesilva View Post
You can see on the picture the circuit diagram from datasheet for TDA7498E.
I don't understand to much reading the circuit diagram, can you help me?
Latter i will post a new picture of the board with better quality.

Best regards.
Those diodes clamp any voltage spikes to either ground or to the positive rail (depending on the polarity of the spike) and so prevent the output pin of the IC being taken either above the supply voltage or below ground potential which could damage it.

The type of diode is not critical but it must be a fast switching type and have a voltage rating equal to at least twice the DC supply voltage plus a safety margin. The current handling needs to be at least a couple of amps or more.

Just try whatever you can get that matches that requirement.
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Old 15th May 2020, 01:38 PM   #20
Mooly is offline Mooly  United Kingdom
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TDA7498E don't produce any sound (red Amplifier module)
Quote:
Originally Posted by Mooly View Post
have a voltage rating equal to at least twice the DC supply voltage plus a safety margin.
I'm just thinking... does it need be twice or is that a bit excessive. Probably wise but it needs to certainly equal the supply voltage plus a safety margin.
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