Temperature detecting circuit and method thereof

摘要

A temperature detecting circuit and method thereof, adapted to a voltage converter circuit which includes a current detecting circuit having a detecting output port outputting a current detecting signal proportional to an output current of the voltage converter circuit, includes: a current signal processing unit, having a signal input port coupling to the detecting output port, a first detecting output port generating a first processing signal with a first temperature coefficient, a second detecting output port generating a second processing signal with a second temperature coefficient, wherein the first and the second processing signals are proportional to the current detecting signal; and, a temperature calculating unit, receiving the first and the second processing signals and performing calculation to derive a temperature value.

主权项

1. A temperature detecting circuit, adapted to a voltage converter circuit which operates a power switch of the voltage converter circuit to regulate energy stored in an inductor and provide energy to a load, the voltage converter circuit including a current detecting circuit coupled to an output stage composed of the power switch and the inductor, the current detecting circuit dynamically detecting an output current on the inductor and having a detecting output port outputting a current detecting signal which is proportional to the output current, the temperature detecting circuit comprising:
a current signal processing unit, including a signal input port, a first detecting output node and a second detecting output node, wherein the signal input port is coupled to the detecting output port, a first processing signal having a first temperature coefficient is generated on the first detecting output node, a second processing signal having a second temperature coefficient, different from the first temperature coefficient, is generated on the second detecting output node, and the first processing signal and the second processing signal are proportional to the current detecting signal; and a temperature calculating unit, including two input nodes coupling to the first detecting output node and the second detecting output node respectively and performing calculation on the first processing signal and the second processing signal to derive a temperature value.