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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:
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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?
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