A Bandgap Reference Circuit with Transient Enhancement

Abstract

A bandgap reference circuit with transient enhancement belongs to the technical field of electronic circuits. Including bandgap reference module, transient enhancement module and slow start module, the bandgap reference module is a Brokaw type reference, which can offset the reference voltage brought by the base current of the second triode and the third triode through the third resistor error; the transient enhancement module forms a dynamic current bias with the second NMOS transistor in the bandgap reference module through the second PMOS transistor and the third PMOS transistor, which optimizes the transient response of the circuit; at the same time, through the second capacitor, the second PMOS transistor The dynamic current provided by the current mirror formed by the third PMOS transistor increases the transient charging current of the gate of the first NMOS transistor; the second capacitor, the second PMOS transistor and the third PMOS transistor also form a feedback loop to prevent the supply voltage from A large drop; the slow start module slowly increases the gate voltage of the first PMOS transistor through the first switch, the second switch, the third switch and the first capacitor, so as to avoid the overshoot of the voltage and current during the loop establishment process.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a bandgap reference circuit with transient enhancement. Background technique [0002] The reference source is an indispensable module in common power management chips such as DC / DC converters, AC / DC converters, charging protection chips, LED drivers, linear voltage regulators, and PWM modulators. The module provides a reference voltage, and the accuracy and stability of the reference source will directly affect the performance of the chip, so it is particularly important to design a high-performance reference source. However, in the traditional reference source, when the reference circuit is started, the reference voltage and current have a large overshoot because the reference loop has not been established, which will cause some tubes in the circuit to have a risk of breakdown. When the circuit involves a sudden change in load When the size of the power MOS is generally large, t...

AI Technical Summary

Problems solved by technology

However, in the traditional reference source, when the reference circuit is started, the reference voltage and current have a large overshoot because the reference loop has not been established, which will cause some tubes in the circuit to have a risk of breakdown. When the circuit involves a sudden change in load When the size of the power MOS is generally large, the gate capacitance is large, so the transient response time of the circuit is long, which seriously affects the circuit performance.

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