Power rail circuit for high-voltage Buck converter

Abstract

The invention belongs to the technical field of electronic circuits, and particularly relates to a power rail circuit for a high-voltage Buck converter. According to the power rail circuit for the high-voltage Buck converter, a pre-step-down module is omitted through a simple auxiliary starting circuit, power consumption is reduced while the circuit structure is simplified, and the function of low power consumption of a power rail is achieved. The whole Buck converter realizes starting of an input current source as low as [mu] A level, and is in a low-power-consumption state in the whole standby process. Compared with the clamping of a diode connection mode, the floating rail LDO clamped by the operational amplifier has the advantage that the influence of the process on the output VOUT signal is small. The whole power rail circuit does not use an integrated voltage-regulator tube, and the output of the power rail circuit is small in change and high in stability under the full process angle.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a power rail circuit used for a high-voltage Buck converter. Background technique [0002] With the continuous advancement of energy saving and emission reduction policies, the market demand for low power consumption products has increased sharply. Taking a switching power supply as an example, in a high-voltage Buck converter, the power rail circuit is usually used to supply power to the internal circuit modules to reduce the internal power consumption of the switching power supply, so that the power consumption of the entire electronic product is lower. In a traditional high-voltage Buck converter, the internal power rail circuit consists of a pre-step-down module, a reference module and an LDO module. The implementation of the power rail is to pre-step down through the voltage regulator tube to obtain a rough voltage to supply power to the subsequent r...

AI Technical Summary

Problems solved by technology

There are the following disadvantages in using the voltage regulator tube to realize the pre-step down: the performance of the integrated voltage regulator tube is greatly affected by the process, and the way of using the voltage regulator tube to realize the pre-down voltage has a large power consumption

Therefore, the above-mentioned power rail circuit is not suitable for application in high-voltage Buck converters with higher requirements for low power consumption.

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