Hello Audio Folks, I have a customer requesting us to do a FA (failure analysis) for a paritcular date code TAS5707 IC. The reason is that the IC temperature is much higher than the other normal IC.
According to customer, the normal IC temperature is 79.6 deg C. The bad IC temeprature is 92 deg C. The bad IC is 12.4 deg C higher.
I take back the bad IC and put it into our TI EVM. I compare with another TAS5707 EVM. Below is the setup and result
PVDD = 24V
Both two channel load = 16 ohm
input = 1KHz sine wave
output = 10W x 2
Test time is 15 minutes.
Room temperautre is around 26 deg C.
Here is the result.
EVM with our own IC on it : temperature = 76.6 deg C.
Bad IC from customer : temperature = 86.7 deg C
So, the result is, even in our own EVM, customer bad IC is still 10.1 deg C higher.
My question is whether the difference is normal and still within our tolerance? If it is not normal, I will submit the IC for FA. If it is normal, I will get back to customer.
Regards,
Kes