A reference voltage source circuit and reference voltage control method

Abstract

The invention discloses a reference voltage source circuit and a reference voltage control method. A first reference voltage generating circuit generates a first reference voltage signal which is equal to a first reference voltage signal output by a band-gap voltage reference. When a system enters a standby state, a first reference voltage signal serving as the output voltage of a reference voltage source is supplied to the system, working of the band-gas voltage reference is stopped, and in this way, the power consumption of the system is low at a low power consumption state.

Description

technical field [0001] The invention relates to the field of reference voltages, and more specifically, to a reference voltage source circuit and a control method for the reference voltage. Background technique [0002] In commonly used working systems such as switching power supplies, the reference voltage source circuit is usually required to provide a reference voltage as the reference voltage of the switching power supply. The common reference voltage generating circuit in the prior art is a bandgap reference circuit. Maintain a constant output voltage under the condition of circuit temperature changes, as a reference voltage for circuit work. [0003] However, the bandgap reference circuit in the prior art usually includes a bandgap circuit, which needs to consume a fixed power consumption in the working process, especially in the low power consumption circuit, which occupies a large proportion of power consumption, that is, when the system enters the state, the loss p...

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Problems solved by technology

[0003] However, the bandgap reference circuit in the prior art usually includes a bandgap circuit, which needs to consume a fixed power consumption in the working process, especially in the low power consumption circuit, which occupies a large proportion of power consumption, that is, when the system enters the state, the loss proportion of the bandgap reference circuit is particularly prominent

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