Bandgap reference circuit with a high vehicle circuit and method for starting up a bandgap reference circuit

摘要

The invention relates to a bandgap reference circuit (1) with a high vehicle circuit (2, 22). The high side of the circuit (2) supports the raising of the bandgap reference circuit (1) until at a resistor (r3) electrical voltage drop across a predetermined threshold voltage is achieved, and is automatically turned off when the at the resistor (r3) falling electric voltage has reached the threshold voltage. The resistor (r3) is connected in series with a diodes half conductor (d2) of the bandgap reference circuit (1) is connected. As an alternative supports the high circuit (22) and the vehicle, the start-up of the bandgap reference circuit (1) so long as a differential voltage between a potential of a node (b1, b2) within the bandgap reference circuit (1) and a further node (b0) of the bandgap reference circuit (1), on which a potential proportional to an output voltage (vout) or an output current of the bandgap reference circuit (1), reaches a predetermined threshold voltage. The differential voltage reaches the threshold voltage, then switches the high circuit (22) and the vehicle automatically. The present invention also relates to corresponding method for starting up a bandgap reference circuit (2, 22).