Part Number: TPA3136D2EVM
I am working on the audio demo using the TPA 3136D2 EVM. The load is a
PBTL mono load.
I am using a 4 Ohm 3W resistor for this, resistance measures 4 Ohm on a multimeter.
This resistor is connected across the OUTL+ and OUTR+ points on the EVM.
I have a 1 kHz, 480 mV p-p signal at the RINP TP of the EVM. I can see this on the scope.
I have the voltage between PLIMIT and GND set to 1.25 V.
I am powering the EVM at 12V DC.
I cannot see anything on the scope when I connect a probe across the resistor ends.
I am unable to read any voltage across the resistor leads as well with a multimeter,
AC or DC.
The DC voltage between OUTL+ and GND measures 5.9V DC. Same voltage between
OUTR+ and GND.
Can you offer any pointers on this? I have attached the EVM configuration used
for a mono PBTL load. Does this need changing?
In reply to Priya Nadathur70:
In reply to Adam Sidelsky:
I doubt your board is damaged.
Using a normal BNC Male-to-male cable, use this adapter to convert to RCA:
Alternatively you can look up a BNC-male to RCA-male cable.
I measured the current drawn by the 12 V powered EVM with no input or load connected.
The meter reads 40 mA. I am told this should read 400 mA? I am attaching the data sheet
of the power supply used. Let me know if this needs changing and how.
Looking at the datasheet for the power supply, the current regulation for a load
10-90% of rated voltage is <= 100 mA.
In reply to Shawn Zheng:
Thank you for your reply. I changed the current limiting for the power supply to 1A.
Now when I hook the load, the power supply voltage does not fall down to 4V.
However, I can smell the resistor burning. The scope waveform gets very noisy
once I turn the power supply on. I am looking for a different power supply to try.
Why is the load smoking?
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.