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Power supply circuit capable of reducing the number of external components

A power supply circuit and circuit technology, which is applied in the direction of transforming equipment structural parts, electrical components, adjusting electrical variables, etc., to achieve the effect of reducing the number of resistors

Inactive Publication Date: 2007-10-17
RENESAS ELECTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is the following problem in the power supply circuit as mentioned above: In order to feed back the change of the output negative voltage to the DC-DC control circuit 12, the reference potential of the voltage setting resistor (Rc) 101 and the voltage setting resistor (Rd) 102 should be set to be determined by A positive potential (Vref) provided by the reference voltage source 10 instead of zero volts

Method used

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  • Power supply circuit capable of reducing the number of external components
  • Power supply circuit capable of reducing the number of external components

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Embodiment Construction

[0019] Referring to FIG. 2 , an illustration of an inverting negative voltage DC-DC power supply circuit according to an embodiment of the present invention is given.

[0020] In this inverting negative voltage DC-DC power supply circuit, one end of the voltage setting resistor (Ra) 1 (the first resistor) is connected to the output terminal 17, and the other end is connected to zero volts through the terminal 8 (the first terminal) of the control IC 100. The emitters of the NPN transistor 2 (first transistor) in the clamping circuit (hereinafter referred to as "clamping circuit") CL1 are connected to each other.

[0021] The base of NPN transistor 2 in clamping circuit CL1 is connected to the base and collector of NPN transistor 3 (second transistor), and NPN transistor 3 determines the clamping voltage of clamping circuit CL1. A current source 6 for operating the clamp circuit CL1 is connected to the base and collector of the NPN transistor 3 in the clamp circuit CL1.

[002...

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Abstract

An inverting negative voltage DC-DC power supply circuit comprises a first resistor having one end connected to an output terminal for converting a change in output voltage into a current. A zero-volt clamp circuit is connected to the other end of the first resistor and comprises a first and second transistor. A current mirror circuit comprises a third and fourth transistor and is connected to the zero-volt clamp circuit for causing a current of the same value as that of a current flowing in the zero-volt clamp circuit to flow. A second resistor is connected to the current mirror circuit for converting a change in current flowing from the zero-volt clamp circuit into a voltage.

Description

[0001] This application claims priority from prior Japanese Patent Application JP 2006-108290, the entire contents of which are incorporated herein by reference. technical field [0002] The present invention relates to an inverted negative voltage DC-DC power supply circuit, and more particularly, to an inverted negative voltage DC-DC power supply circuit capable of reducing the number of external parts or components. Background technique [0003] Normally, in an inverting negative voltage DC-DC power supply circuit, in order to prevent negative voltage from being input to the control IC, the reference potential of the resistor used to set the output voltage should be set to a positive reference potential instead of ground potential (zero volts). [0004] Referring to FIG. 1 , a specific example of a conventional inverting negative voltage DC-DC power supply circuit is described. This example has been described in, for example, the Output Voltage Setting (2 ) in Negative ...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M3/155H02M3/156G05F1/56
CPCH02M7/003H02M2001/0025H02M1/0025
Inventor 小山英明佐藤廉志
Owner RENESAS ELECTRONICS CORP