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Circuit device, switching regulator, and electronic device

A circuit device and a switching circuit technology, applied in the field of circuit devices, can solve problems such as power loss and conversion efficiency drop, and achieve the effect of suppressing reverse current

Active Publication Date: 2017-10-20
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since power loss occurs in the sense resistor 12 connected to the current path, the sense resistor 12 becomes a main cause of conversion efficiency reduction especially in a state where the load current is small.

Method used

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  • Circuit device, switching regulator, and electronic device
  • Circuit device, switching regulator, and electronic device
  • Circuit device, switching regulator, and electronic device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0030] figure 1 It is a circuit diagram showing a configuration example of the switching regulator according to the first embodiment of the present invention. This switching regulator includes the circuit device 100 according to the first embodiment of the present invention. like figure 1 As shown, the circuit device 100 may include: a reference voltage generation circuit 10 , a switch control circuit 20 , a pre-driver 30 , an output circuit 40 , and a current detection circuit 50 .

[0031] figure 1 At least some of the shown constituent elements may be built in a semiconductor integrated circuit device (IC). The IC is constituted by, for example, an IC chip on which a circuit is formed on a silicon substrate, or by housing the IC chip in a package. In this case, the nodes N1 to N4 of the circuit device 100 correspond to pads (terminals) of the IC chip or pins (terminals) provided on the package.

[0032] In addition, the switching regulator may further include an induct...

no. 2 approach

[0079] Figure 5 It is a circuit diagram showing a configuration example of the switching regulator according to the second embodiment of the present invention. This switching regulator includes the circuit device 100a according to the second embodiment of the present invention. In circuit arrangement 100a, instead of figure 1 The current detection circuit 50 in the circuit device 100 according to the first embodiment shown includes a current detection circuit 50a. In other respects, the second embodiment may be the same as the first embodiment.

[0080] The current detection circuit 50a includes an N-channel MOS transistor QN51 as a first switch circuit, an N-channel MOS transistor QN52 as a second switch circuit, a resistor R52 as an impedance element, and a comparator 51 as a comparison circuit. The detection circuit 50 a also includes an inverter 52 .

[0081] The transistor QN51 has one end (one of the drain and the source) connected to the output node N3, the other e...

no. 3 approach

[0087] Next, a third embodiment of the present invention will be described. In the third embodiment, omitting the figure 1 The switching regulator according to the first embodiment shown, or Figure 5 Resistor R52 as an impedance element in the switching regulator according to the second embodiment shown. Instead, a transistor with high on-resistance is used as the transistor QP52 or QN52 of the second switch circuit.

[0088] Preferably, the on-resistance of the transistor QP52 or QN52 is higher than other transistors, especially higher than the on-resistance of the transistor QN51 of the first switch circuit, more preferably, at least one bit higher than the on-resistance of the transistor QN51 . In other respects, the third embodiment may be the same as the first or second embodiment. Even according to the third embodiment, the same effect as that of the first or second embodiment can be obtained.

[0089] Electronic equipment

[0090] Next, an electronic device using...

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PUM

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Abstract

The invention provides a circuit device, a switching regulator, and an electronic device. The circuit device includes a first switching circuit that has one end connected to an output node, and turns on and off according to a drive signal, a second switching circuit that is connected in series with an impedance element between another end of the first switching circuit and a node having a predetermined potential, and turns off and on complementarily with the first switching circuit, a comparator circuit that outputs an output signal indicating whether or not a potential of the other end of the first switching circuit is higher than a determination level, and a control circuit that controls a level of the drive signal based on the output signal of the comparator such that the switching element enters a non-conduction state.

Description

technical field [0001] The invention relates to a switching regulator for converting a DC voltage into a DC voltage of a different value, and a circuit arrangement constituting at least a part of the switching regulator. Furthermore, the present invention also relates to electronic equipment and the like using such a switching regulator. Background technique [0002] In a switching regulator that steps down a DC voltage, an operation is performed to supply a driving current to an inductance element by controlling switching elements of an output circuit to be on or off. For example, the output circuit is constituted by a bridge circuit having switching elements on the high-voltage side and switching elements on the low-voltage side. [0003] When the switching element on the high-voltage side and the switching element on the low-voltage side are built in a semiconductor integrated circuit device (IC), as an external component, one end of the inductance element is connected t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0009H02M3/1586H02M3/1588Y02B70/10H02M1/0032H02M1/0048H02M3/158H02M1/08
Inventor 山田敦史赤沼英幸
Owner SEIKO EPSON CORP
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