In the datasheet of TPA6130A2,
TA Operating free-air temperature range is –40°C to 85°CTJ Operating junction temperature range is –40°C to 125°C
And in page 6 there are two parameters of Thermal shutdown, 1. Threshold 180 °C 2. Hysteresis 35 °C
So what is the mean of the two parameters?
The device has thermal shutdown in case something goes wrong in the external circuitry and tries to draw too much power from the TPA6130A2. This is a last hope to save the device before it blows up. For this device, the outputs are switched off when the die temperature reaches 180C. Once the die cools off to about 145C, the outputs are re-enabled. If the problem is still there, the die will heat up, the part will turn off the outputs, blah, blah, blah.
Audio Applications Engineering Manager
Dallas, TX USA
Thanks a lot!
Thermal A 1 on this bit indicates a thermal shutdown was initiated by the hardware. When the temperature drops to safe levels, the device will start to operate again, regardless of bit status. This bit is clear-on-read.
If the register turn low level automatically When the temperature drops to safe levels, or holding high level until read?
Once thermal is tripped, that bit will be 1 until: 1) normal device operation, and 2) you read it. Once you read it, it resets the bit to 0. So, if you're trying to determine if it's CURRENTLY in thermal, you will need to read it twice, and take the second result.
It might be a little tricky as the device typically cycles in and out of thermal if there is a problem on the outputs... It probably does this at a rate of 0.5 to 3 Hz, depending on your system.
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