| 摘要 |
A bandgap type, thermal protection circuit for an integrated circuit does not require the use of a comparator and a voltage divider of the bandgap voltage. By contrast, the simplified thermal protection circuit of the invention utilizes a first transistor for mirroring the current flowing through the bandgap circuit through a second transistor that is functionally connected between the output node and ground. The control terminal of the second transistor is connected to a temperature dependent voltage derived from the bandgap circuit. The crossing point between the characteristic of such a temperature dependent voltage and of the VBE characteristic of the second transistor versus temperature determine the required transition on the output node.
|
