what exactly is thermal shutdown?

in IC's there is a term used that the ic ic capable of thermal shutdown ....
what is it in detail also when an IC goes under thermal shutdown does it damage it self???
or it damages and makes the circuit open circuit to prevent other components from getting damaged?

canucksgirl5 years ago
I had to do some research but I found you this explanation;

"Thermal shutdown is a feature found in modern three terminal IC regulators. When the regulator exceeds a safe operating temperature, the pass transistor is cut off and the output voltage goes to zero. When the device cools, the pass transistor is again turned on. If the original cause of the excessive temperature is still present, the device again shuts off. If the cause has been removed, the device works normally. This feature makes the regulator almost indestructible."

I hope that helps. 
thegeeke5 years ago
Generally, thermal switches are designed to prevent damage. For instance, when I purchased my current van, (used) the switch for the driver's power window would get stuck in the down position. If you didn't pull it to the off position manually, within a minute, a thermal switch would turn off. If you let it cool down for a few minutes, it would work just fine. In an IC, I would think of a thermal switch as an absolute last resort, though. You can never be sure of all the variables in terms of heat when you make custom electronics (at least I can't... I'm sure there are people who can), so you don't want to rely on a thermal shutdown.
ICs designed with thermal shutdown sense their own die temperatures and clamp the output to safe levels. If the device needs a heatsink, and isn't fitted with one, going into shutdown can still destroy the device, because the die can't stay cool enough to be safe.