Over-temperature detecting circuit with high precision
OwnerMao-Chuan Chien, Shun-Hau Kaoinventors
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Abstract
An over-temperature detecting circuit includes a band-gap circuit for generating a temperature-drop-dependent voltage and a reference voltage not varying with the temperature, a transistor coupled to the band-gap circuit for generating a temperature-rise-dependent current according to the temperature-drop-dependent voltage, a resistor coupled to the transistor for generating a temperature-rise-dependent voltage according to the temperature-rise-dependent current, and a comparator coupled to the band-gap circuit and the resistor for generating a thermal shutdown signal according to the reference voltage and the temperature-rise-dependent voltage.
Claims11
An over-temperature detecting circuit, comprising:
- a band-gap circuit, for generating a temperature-drop-dependent voltage and a reference voltage not varying with temperature;
- a transistor, coupled to the band-gap circuit, for generating a temperature-rise-dependent current according to the temperature-drop-dependent voltage;
- a resistor, coupled to the transistor, for generating a temperature-rise-dependent voltage according to the temperature-rise-dependent current;
- and
- a comparator, coupled to the band-gap circuit and the resistor, for generating a thermal shutdown signal according to the reference voltage and the temperature-rise-dependent voltage.
Dependencies are inferred from the claim text.