JP-7855071-B2 - Switching regulator

JP7855071B2JP 7855071 B2JP7855071 B2JP 7855071B2JP-7855071-B2

Inventors

丹治景斉

Assignees

日清紡マイクロデバイス株式会社

Dates

Publication Date: 20260507
Application Date: 20220616

Claims (6)

A switching regulator comprising a pair of switch elements connected in series with each other, A comparator compares the switching voltage corresponding to the inductor current flowing from the switching regulator to the inductor with a predetermined reference voltage and outputs a comparison result signal. A monitoring circuit that generates a current for generating a monitoring voltage to monitor the switching voltage, A reference voltage circuit that generates a current for generating the aforementioned reference voltage, The system includes a control circuit that generates multiple selection signals indicating multiple different timings and outputs them to at least one of the monitoring circuit and the reference voltage circuit, At least one of the monitoring circuit and the reference voltage circuit changes the generated current according to the plurality of timings, At least one of the monitoring circuit and the reference voltage circuit is shared for the plurality of timings. Switching regulator.
At least one of the monitoring circuit and the reference voltage circuit includes a circuit in which a first constant current source and a second constant current source and a switch are connected in series are connected in parallel. A switching regulator according to claim 1.
The reference voltage of the aforementioned reference voltage circuit is generated at a point where the reference voltage is grounded via a MOS transistor to which a predetermined voltage is applied to the gate. The switching regulator according to claim 2.
The reference voltage of the aforementioned reference voltage circuit is determined by the point at which the reference voltage is generated being grounded via a resistor. The switching regulator according to claim 2.
The reference voltage of the aforementioned reference voltage circuit is determined when the point of generation of the reference voltage is grounded. The switching regulator according to claim 2.
The monitoring circuit and the reference voltage circuit each include a first constant current source and a MOS transistor to which a predetermined voltage is applied, connected to the point where the monitoring voltage or the reference voltage is generated. By applying the selection signal to the back gate of the MOS transistor, the resistance value of the MOS transistor is changed, thereby changing the monitoring voltage or the reference voltage. A switching regulator according to claim 1.

Description

This invention relates to a switching regulator. It is already known that in conventional switching regulators, miniaturization of integrated circuits (ICs) is required in order to reduce the mounting area. For example, Patent Document 1 describes a conventional switching regulator invented to enable multiple abnormality detection functions of a switching regulator to operate with low power consumption and to reduce the area occupied by the semiconductor device. This switching regulator is characterized by comprising a comparator circuit, multiple switch circuits, and a switch control circuit, and by switching the multiple switch circuits with multiple control signals of the switch control circuit, thereby realizing multiple abnormality detection functions with a single comparator circuit. In other words, Patent Document 1 discloses a technique for reducing chip area by switching the reference voltage and monitoring voltage of multiple detection circuits with different operating timings, and using a single comparator circuit for both purposes. Patent No. 6656956 This is a block diagram showing the configuration of the switching regulator 1 related to the basic circuit.This is a block diagram showing the configuration of the zero-crossing detector 11 in Figure 1.Figure 1 shows a timing chart of each signal illustrating an example of the operation of the switching regulator 1.This is a block diagram showing the configuration of the current monitor circuit 11A according to modified example 1.This is a timing chart of each signal showing an example of the operation of a switching regulator including the current monitor circuit 11A in Figure 4.This is a block diagram showing the configuration of the current monitor circuit 11B according to modified example 2.Figure 6 shows a timing chart of each signal illustrating an example of the operation of a switching regulator including the current monitoring circuit 11B.This is a block diagram showing the configuration of the current monitor circuit 11C according to modified example 3.Figure 8 shows a timing chart of each signal illustrating an example of the operation of a switching regulator including the current monitor circuit 11C.This is a block diagram showing the configuration of the current monitor circuit 11D according to modified example 4.Figure 10 shows a timing chart of each signal illustrating an example of the operation of a switching regulator including the current monitoring circuit 11D.This is a block diagram showing the configuration of the current monitor circuit 11E according to a comparative example.This is a block diagram showing a part of the configuration of the current monitoring circuit 11E shown in Figure 12.Figure 13 shows a timing chart of each signal illustrating an example of the operation of a switching regulator including the current monitoring circuit 11E.This is a block diagram showing a part of the configuration of the current monitoring circuit 11E shown in Figure 12.Figure 15 shows a timing chart of each signal illustrating an example of the operation of a switching regulator including the current monitor circuit 11E.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11F according to Embodiment 1.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11G according to Embodiment 2.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11H according to Embodiment 3.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11I according to Embodiment 4.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11J according to Embodiment 5.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11K according to Embodiment 6.This is a block diagram showing an example configuration of a switching regulator including a current monitoring circuit 11L according to Embodiment 7.This is a block diagram showing an example configuration of a switching regulator including a current monitor circuit 11M according to Embodiment 8. Embodiments and modified examples of the present invention will be described below with reference to the drawings. The same or similar components are denoted by the same reference numerals. (Inventor's insights) First, in order to explain the problems of the present invention, the basic circuit will be described below. (Basic circuit) Figure 1 is a block diagram showing the configuration of the switching regulator 1 related to the basic circuit. In Figure 1, the switching regulator 1 is configured to include a switching modulation circuit 10, an inverter INV1, a noa gate NOR1, a zero-crossing detector 11, a pair of switching elements which are MOS transis