Has anyone used this board? I just got one in today and it doesn't work.
TPA3116 Mono Channel Digital Power Audio Amplifier Board BTL Out 100W DC 12V 24V | eBay
I am using a Meanwell 24 volt, 65 watt supply. If I put a 3.9 ohm load on the output (no input signal), it constantly cycles in and out of shutdown mode. It also causes the Meanwell supply to cycle in and out of shutdown mode.
If I remove the output load and watch the output on a scope (ground lead capacitor isolated) the output cycles between 24V and ground about every 1/2 second. I guess this means one of the bridges is shorted to the supply rail?
Also, as received, R1 was a 100k ohm resistor and R2 was a 47k ohm resistor. When I say R1 and R2, I am referring to the gain set resistors that are shown in the data sheet. This would indicate the unit was setup for around 30 dB gain in slave mode. I changed the resistors to 39k and 100k to put it in master mode with 32 dB gain.
That did not resolve the issue with the board not working. Should I just write it off as a bad board?
I have a couple of these that work just fine:
DC 8 26V TPA3118 PBTL Mono Digital Amplifier Board Amp Module 1 60W for Arduino | eBay
TPA3116 Mono Channel Digital Power Audio Amplifier Board BTL Out 100W DC 12V 24V | eBay
I am using a Meanwell 24 volt, 65 watt supply. If I put a 3.9 ohm load on the output (no input signal), it constantly cycles in and out of shutdown mode. It also causes the Meanwell supply to cycle in and out of shutdown mode.
If I remove the output load and watch the output on a scope (ground lead capacitor isolated) the output cycles between 24V and ground about every 1/2 second. I guess this means one of the bridges is shorted to the supply rail?
Also, as received, R1 was a 100k ohm resistor and R2 was a 47k ohm resistor. When I say R1 and R2, I am referring to the gain set resistors that are shown in the data sheet. This would indicate the unit was setup for around 30 dB gain in slave mode. I changed the resistors to 39k and 100k to put it in master mode with 32 dB gain.
That did not resolve the issue with the board not working. Should I just write it off as a bad board?
I have a couple of these that work just fine:
DC 8 26V TPA3118 PBTL Mono Digital Amplifier Board Amp Module 1 60W for Arduino | eBay
Sounds like it is blown.
You haven't connected supply wrong way around at any point ?
Have you tried it with an 8 ohm load ?
Have you looked for solder bridges on pcb ? maybe they just build them and don't test them.
You haven't connected supply wrong way around at any point ?
Have you tried it with an 8 ohm load ?
Have you looked for solder bridges on pcb ? maybe they just build them and don't test them.
Nigel, sorry for the late reply. I haven't been on the site for a couple of days.
The power supply was wired correctly. When I first applied power it showed some kind of strange oscillation pattern. It looked like 2 sine waves 90 degrees out of phase.
I tried 4 ohm and 8 ohm resistor loads with no luck. I tried driving it with my signal generator but nothing showed at the output except the strange oscillation signal. It finally died and started exhibiting the symptoms described in my first post.
I took the heat sink off but don't see any shorts. I have just written it off as a bad counterfeit chip. I will put my hot air station on the bench in a couple of days and remove the chip. Maybe get a real chip from Mouser that costs the same as this complete board did.
In the meantime, I have ordered one of these blue boards:
DC 12V 24V 100W TPA3116DA Mono Channel Digital Power Audio Amplifier Board | eBay
Maybe this one will work better. I am trying to get 40 watts out (1%) into a 4 ohm load. I can almost get there with one of the TPA3118 boards if I keep a fan blowing on the chip. This is with a continuous sine wave input. I think the TPA3116 with the heat sink will do that.
The power supply was wired correctly. When I first applied power it showed some kind of strange oscillation pattern. It looked like 2 sine waves 90 degrees out of phase.
I tried 4 ohm and 8 ohm resistor loads with no luck. I tried driving it with my signal generator but nothing showed at the output except the strange oscillation signal. It finally died and started exhibiting the symptoms described in my first post.
I took the heat sink off but don't see any shorts. I have just written it off as a bad counterfeit chip. I will put my hot air station on the bench in a couple of days and remove the chip. Maybe get a real chip from Mouser that costs the same as this complete board did.
In the meantime, I have ordered one of these blue boards:
DC 12V 24V 100W TPA3116DA Mono Channel Digital Power Audio Amplifier Board | eBay
Maybe this one will work better. I am trying to get 40 watts out (1%) into a 4 ohm load. I can almost get there with one of the TPA3118 boards if I keep a fan blowing on the chip. This is with a continuous sine wave input. I think the TPA3116 with the heat sink will do that.
I have the same board. Resistors are R1 100k and R2 47k. I have no idea how this even works, or why they would do this, as this is not even listed in the TI datasheet. Board works but gain is way to much.
The board you link to in last post has a small potentiometer. These chip amps do not like a varying Z and will result in a hiss.
The board you link to in last post has a small potentiometer. These chip amps do not like a varying Z and will result in a hiss.
I took the chip off of the board today. I don't know what a real chip looks like so I don't know if this one is counterfeit or not.
This is a photo of the one off of my board:
View attachment TPA3116.bmp
This is a photo of the one off of my board:
View attachment TPA3116.bmp
Possibly this is why the board doesn't work? They have the SYNC pin grounded as shown in the attached photo. Since the board is also configured with the resistors to be a slave board with SYNC acting as an input, would it work?
Does anyone know if this is a valid configuration? I looked at one of my TPA3118 boards which is wired for PBTL mode. They have the gain set for 32 dB running in master mode. That board has the SYNC pin floating. Of course if they grounded it, that would short the buffer output to ground and possibly damage the part.
I changed the original resistors from 100k and 47k to 39k and 100k. That may be why my board quit working. I am going to order a TI part from Mouser and put it on the board rather than risk putting the original part back on. The original part didn't work anyway.
Does anyone know if this is a valid configuration? I looked at one of my TPA3118 boards which is wired for PBTL mode. They have the gain set for 32 dB running in master mode. That board has the SYNC pin floating. Of course if they grounded it, that would short the buffer output to ground and possibly damage the part.
I changed the original resistors from 100k and 47k to 39k and 100k. That may be why my board quit working. I am going to order a TI part from Mouser and put it on the board rather than risk putting the original part back on. The original part didn't work anyway.
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