thermal shutdown in ic desgn

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whit

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Hi
I am new in ic design and i want to know the principle on
how to implement the shermal shutdow in a ic. can someone
show me a link or book which relate in detail for this subject?
 

It is usually implemented by comparing a PTAT voltage with the bandgap voltage, or a PTAT voltage with a Vbe, you can set your trigger point by adjusting the voltages.
 

Thanks ary

Are there some books address particulally in this kind of design?
 

Sorry, I haven't seen any, if anyone knows maybe he can post it here for everyone's reference.
 

the principle goes like this..
a fixed reference base voltage (lower than Vbe) is applied in an off-state NPN transistor (biased by the resistor).
when temp rises, transistor Vbe goes down, thereby, triggering the transistor when it reached a Vbe lower than the reference voltage..
when the transistor conducts, it shorts VCC to the ground, hence, shutting down the ckt...
i am sorry, i also do not have material of this...
 

Did you look at Analog and Digital IC design?

nguyennam
 

I am looking some bandgap reference circuit and
seems the thermal shutdown ckt can be derived
from this kind of circuit , as mention by road.
 

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