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Switch regulator

A switching regulator and switching circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of increased semiconductor device area, increased current consumption, and current consumption, so as to reduce current consumption and reduce The effect of occupying an area and low cost

Active Publication Date: 2017-09-15
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When there are many objects to be monitored such as power supply voltage and temperature, the same number of comparator circuits as those objects are required, resulting in an increase in the area of ​​the semiconductor device
In addition, since the power corresponding to the number of comparison circuits is consumed, the current consumption increases
For example, even if each comparison circuit is operated in a time-division (time-division) manner, it takes time until the operation of the comparison circuit stabilizes when the comparison circuit is activated, resulting in consumption of unnecessary current.

Method used

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Examples

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Embodiment Construction

[0015] figure 1 It is a circuit diagram showing an example of the switching regulator of this embodiment.

[0016] The switching regulator 100 of this embodiment includes a power FET 2, a power FET 4, an inductor 3, a capacitor 5, a feedback resistor 6, a comparison circuit 10, an on-time control circuit 11, a reference voltage circuit 12, an R-S flip-flop circuit 13, an output Control circuit 15 , drive circuit 16 , drive circuit 17 , comparison circuit 20 , switch circuits 21 to 23 , voltage divider circuit 24 , temperature sensor 25 , reference voltage circuit 26 , reference voltage circuit 27 and switch control circuit 28 .

[0017] The feedback resistor 6 is connected between the output terminal OUT and the GND terminal. The input terminal of the comparison circuit 10 is connected to the output terminal of the feedback resistor 6 and the output terminal of the reference voltage circuit 12 . The set terminal S of the R-S trigger circuit 13 is connected to the output ter...

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PUM

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Abstract

To operate a plurality of abnormality detecting functions of a switching regulator with low power consumption and configure an occupied area of a semiconductor device to be reduced. A switching regulator is configured to be equipped with a comparison circuit, switch circuits, and a switch control circuit and to switch the switch circuits by control signals of the switch control circuit and realize a plurality of abnormality detecting functions by the one comparison circuit.

Description

technical field [0001] The present invention relates to a switching regulator, in particular to a protection circuit for a switching regulator. Background technique [0002] Switching regulators are used as voltage supply sources for a wide variety of electronic devices. Therefore, in order to ensure the safety of electronic equipment, various protection functions become important functions. [0003] figure 2 An example of a circuit diagram of a conventional switching regulator is shown. A conventional switching regulator 200 includes a feedback resistor 6, a reference voltage circuit 12, a comparison circuit 10, an R-S flip-flop circuit 13, an on-time control circuit 11, an output control circuit 15, a drive circuit 16, a drive circuit 17, a power FET 2, a power FET 4, inductor 3 and capacitor 5. In addition, the conventional switching regulator 200 includes a power supply voltage monitoring circuit 30 , an overheat protection circuit 40 , and a control circuit 14 as pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/00H02H7/12
CPCH02H7/1203H02H7/1213H02M1/0003H02M3/155H02M3/158H02M1/32Y02B70/10H02M1/0048H02M3/156H02M1/0032
Inventor 河野明大后藤克也
Owner SII SEMICONDUCTOR CORP