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 Adam Sidelsky:
In reply to Priya Nadathur70:
The first picture is the input to the EVM, 1kHz, 490 mV signal. Two waves are seen because one is RINP,
the other is the function generator output.
The loudspeaker when connected gives a loud tone, no clicking/ticking heard like from the past.
The scope picture however is noisy, only the left part of the speaker shows a switching waveform,
right part is 0 V (maybe this is how the mono output looks like?)
I was hoping to snap a perfect EVM output waveform picture.
In reply to Shawn Zheng:
Attached are 3 pictures of the test bench setup:
1. Wavetek function generator provides 1 kHz sine wave input, 490 mV p-p.
2. EVM shown with input connected to RINP. Note that the PBTL jumper is the only jumper in
the EVM that is open.
3. An RCA cable adapter is attached to the function generator probe. One end of this RCA cable is
used for the input connections, the sleeve of the other end of this cable is used for the GND connections.
Please review and offer your feedback ASAP. If the configuration needs changing, we need to know right away.
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