JPH08241140A - Variable output type direct-current constant-current circuit device - Google Patents

Abstract

PURPOSE: To provide the variable output type DC constant-current circuit device which can obtain a different output current value although is is constituted as an integrated circuit device. CONSTITUTION: The DC constant-current circuit device 1 is equipped with output current value adjusting circuit parts 2A and 2B which have a p-MOS 3, a transmission gate(TG) 4 as a switching element, pMOSs 31 and 42, and an inverter 41. The drain of the pMOS 3 is connected to the drain of a pMOS 63 that a current mirror circuit device part 6 has. The TG 4 is connected between the gate of the pMOS 3 and the mutual connection point of the gates of a pMOS 62 and a pMOS 63, and the drain of the pMOS 42 is connected to the input terminal of the inverter 41, one gate of the TG 4, and a signal terminal 2a; and the output terminal of the inverter 41 is connected to the other gate and the gate of the pMOS 42 is grounded. The pMOS 31 serves to surely hold the pMOS 3 OFF.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable output type DC constant current circuit device having an integrated circuit structure capable of adjusting an output current value, and has been improved so that different output current values can be obtained. Regarding its circuit configuration.

[0002]

2. Description of the Related Art A circuit device which is integrally formed with another electronic circuit device in an integrated circuit device and supplies a direct current having a constant value to the other electronic circuit device, or is configured as an integrated circuit device and has a constant value. A DC constant current circuit device is often used as a circuit device that outputs a DC current, and a variable output type DC constant current circuit capable of adjusting the value of the DC current to be output is included in this DC constant current circuit device. Devices are also known.

Before entering the description of the conventional variable output type DC constant current circuit device, a fixed output type DC constant current, which is the basis of the conventional variable output type DC constant current circuit device, will be described. The circuit device will be described first with reference to FIG. Here, FIG. 2 is a circuit diagram showing a main part of a fixed output type DC constant current circuit device. In FIG. 2, 9A
Is a DC constant current circuit device having a fixed output current value, which includes a current mirror circuit device unit 6, a known constant current bias circuit device unit 7, and an output terminal 8. The constant current bias circuit device unit 7 includes a pMOS 71 which is a semiconductor element which operates as a reference transistor, a pMOS 72 which is a semiconductor element which operates as a driven transistor, and a pMOS 7.
A known constant current source device 73 for supplying a constant value DC current I ₀ to 1 and an nMOS 74 are provided. pMOS71
And the gates which are the control poles of the pMOS 72 are connected to each other as shown in the drawing, and the pMOS 71 and pM
A well-known current mirror circuit is configured with the OS 72, and the pMOS 72 supplies a direct current having a value corresponding to the value of the direct current I ₀ to the nMOS 74. nMOS74
Receives a direct current from the pMOS 72, generates a direct current bias voltage V ₇ having a value corresponding to the value of the direct current I ₀ , and outputs it from the output unit 7a.

The current mirror circuit device section 6 comprises an nMOS 61 and pMOSs 62 and 63 which are semiconductor elements. The pMOS 62 and the pMOS 63 form a well-known current mirror circuit. nMOS61 is
The DC bias voltage V ₇ is input via the input unit 6a, and the pMOS 62 operating as the reference transistor is supplied with the DC current I ₆₁ having a value corresponding to the value of the DC current I ₀ .
The pMOS 63, which operates as a driven transistor, outputs an output current I ₉ which is a direct current having a value corresponding to the value of the direct current I ₆₁ . The output current I ₉ is output from the terminal 8 of the DC constant current circuit device 9A.

The value of the output current I ₉ output from the DC constant current circuit device 9A having such a configuration is proportional to the value of the DC current I ₀ supplied from the constant current source device 73. It has the value according to (1).

[0006]

[Equation 1] In the DC constant current circuit device 9A, the value of the output current I ₉ can be set to an appropriate value at the time of design by adjusting the channel area of each of the pMOS 62 and pMOS 63. After the area is determined, the value of the output current I ₉ becomes a fixed value in the DC constant current circuit device 9A, and the value cannot be adjusted. Therefore, in the DC constant current circuit device 9A mass-produced as an integrated circuit device, when the characteristics of the built-in MOS vary, the value of the output current I ₉ also varies.

In the known DC constant current circuit device, a trimming circuit section is provided in addition to the circuit configuration of the DC constant current circuit device 9A, and for example, the output current value is checked at the time of shipment. There is also a variable output type DC constant current circuit device that can be adjusted. FIG.
It is the circuit diagram which shows the principal part of the variable output type DC constant current circuit device of a prior art example. 3, the same parts as those of the fixed output type DC constant current circuit device shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In addition, in FIG. 3, about the code | symbol attached | subjected in FIG. 2, only the typical code | symbol was described.

In FIG. 3, 9 is a variable output type DC constant current circuit device in which a trimming circuit section 5 is added to the fixed output type DC constant current circuit device 9A shown in FIG. Is. The trimming circuit section 5 has a plurality of sets (FIG. 3 shows one end connected to a signal line connecting the output section 7a of the constant current bias circuit apparatus section 7 and the input section 6a of the current mirror circuit apparatus section 6). 2 sets of nMOS 52 and a switching device 53 are connected in series. Therefore, the trimming circuit unit 5
The nMOS 52 included in is connected in parallel with the nMOS 74 included in the constant current bias circuit device unit 7 when the switch device 53 is closed.

DC constant current circuit device 9 having the above configuration
Is a circuit device in which the nMOS 52 is connected in parallel to the nMOS 74 by closing the switch device 53 included in the trimming circuit unit 5 and the channel area of the nMOS 74 is equivalently increased to perform trimming.
The trimming is performed after the integrated circuit device is manufactured, and the value of the direct current I ₆₁ flowing through the pMOS 62, which is the reference transistor included in the current mirror circuit device unit 6, is reduced, so that the value of the output current I ₉ can be adjusted. Of. In the DC constant current circuit device 9, the trimming is performed after the integrated circuit device is manufactured to finely adjust the value of the output current I ₉ to obtain a highly accurate (for example, ± 5 [%]) output current value. It has been possible to mass-produce its own DC constant current circuit device.

In the DC constant current circuit device 9 which is an integrated circuit device, a constant voltage diode is generally used for the switch device 53, and the trimming work is performed by using a switch which is a constant voltage diode for a pulse having a large voltage value. In addition to the device 53, the constant voltage diode is electrically destroyed,
This is done by electrically short-circuiting.

[0011]

In the variable output type DC constant current circuit device according to the prior art described above, it is possible to mass-produce a device having a highly accurate output current value even though it has an integrated circuit configuration. However, there are the following problems.
That is, for example, in the case of a variable output type DC constant current circuit device incorporated in an integrated circuit device having the same structure, different output currents I ₉ are used in order to use the integrated circuit device having the same structure under different conditions. There are cases where a customer requests the manufacture of a plurality of types of integrated circuit devices in which a variable output type DC constant current circuit device having a value of is stored. In the variable output type DC constant current circuit device 9 of the conventional example, this is dealt with by the following method.

Fabricate the required number of different integrated circuit devices. Only one type of integrated circuit device is manufactured, and the trimming circuit section 5 is used to trim the output current I ₉ under different conditions. Further, although only one type of integrated circuit device is manufactured and the value of the output current I ₉ is also one type, it is connected in series to enable the customer to change the value of the output current I _9. A method of manufacturing the integrated circuit device by additionally incorporating the circuit body 51 is also conceivable.

However, the method according to
The cost of integrated circuit devices is extremely low due to the extremely low efficiency of device manufacturing.
Becomes expensive. The same integrated circuit device
Different output current I in the test process₉Trimmed to the value of
Can be confusing during this process
It is inevitable that production efficiency will deteriorate. Also due to
The method is one of the nMOS 52 of the series connection circuit body 51.
Output current by adding two or two to conduct
I₉This is a method of trimming the
First, the channel area of the nMOS 74 is
Equivalently increased, which causes the nMOS 74 to generate
DC bias voltage V₇Reduce the value of. This direct current
As voltage V₇Value is reduced and given to pMOS62
DC current I ₆₁By reducing the value of₉The value of the
Is to reduce. Therefore, the nMOS 52
Conduction and output current I₉Many elements are involved during the reduction of the value of
I am crossing. For this reason, the output obtained by
Force current I₉The accuracy of the value of is poor, and it has not been put to practical use.
Yes.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is a variable output type capable of obtaining different output current values while being configured as an integrated circuit device. Another object of the present invention is to provide a DC constant current circuit device.

[0015]

According to the present invention, the above-mentioned objects are: 1) a circuit device configured as an integrated circuit device,
One of a current mirror circuit device section having a semiconductor element that operates as a reference transistor and a semiconductor element that operates as a driven transistor, in which the control poles of both transistors are connected to each other, and one of the driven transistors of the current mirror circuit apparatus section And an output terminal connected to the main pole of the reference transistor, and the value is variable while being proportional to the value of the reference current flowing from the output terminal to the main pole of the reference transistor through one main pole of the driven transistor. A variable output type DC constant current circuit device for outputting a DC constant current, comprising one or a plurality of output current value adjusting circuit units each having a current value adjusting transistor connected in parallel with a driven transistor, The current value adjusting circuit section includes a transistor for adjusting the current value, a control pole of this transistor, and a current mirror. The switching device is connected between the respective control poles of both transistors of the path device section and the interconnection point, and a terminal for inputting a command signal for instructing opening / closing of this switching element is input to the terminal. The transistor for current value adjustment is turned on / off according to the command content of the command signal to be output, and by turning on / off the transistor for current value adjustment of the output current value adjustment circuit section, The configuration is such that the value of the constant DC current to be output is changed, or 2) in the means described in the above item 1, the output current value adjusting circuit unit is such that the command signal input to the terminal is at a low level. In a certain case, the switching element is turned on, and thereby the transistor for adjusting the current value is turned on, or 3) In the means described in 1 or 2 above. The driven transistors included in the current mirror circuit device section and the current value adjusting transistors included in all the output current value adjusting circuit sections are arranged close to each other in the integrated circuit device. Achieved by

[0016]

According to the present invention, in a variable output type DC constant current circuit device configured as an integrated circuit device,
(1) One or a plurality of output current value adjusting circuit units each having a transistor for adjusting a current value, which is connected in parallel to a driven transistor, are provided, and the output current value adjusting circuit unit includes:
The current value adjusting transistor, a switching element connected between the control pole of this transistor and the interconnection point of the control poles of both transistors of the current mirror circuit device section, and a switching element of this switching element. It has a terminal for inputting a command signal for instructing opening and closing, and the transistor for current value adjustment is turned on and off according to the instruction content of the command signal input to the terminal, and the output current value adjustment circuit section By turning on and off the current value adjusting transistor that is provided, the value of the DC constant current output from the output terminal is changed, so that the current value adjusting circuit part for adjusting the current value is provided. The transistor is
Only when the switching element is turned on, it is turned on by the drive signal itself given to the driven transistor of the current mirror circuit device section and electrically connected in parallel to the driven transistor of the current mirror circuit device section. . When the transistor for adjusting the current value is turned on, the value of the current I ₂ output by this transistor has the value according to the equation (2) because the drive signal is under the above condition. Here, I ₉ is the output current output from the driven transistor.

[0017]

[Equation 2] This current I ₂ merges with the output current I ₉ and is included in the output current I ₁ output from the output terminal of the variable output type DC constant current circuit device. Therefore, in the variable output type DC constant current circuit device according to the present invention, by providing an appropriate number of output current value adjusting circuit sections having transistors for adjusting an electric current value having an appropriate channel area, the output of an appropriate value can be obtained. Obtaining an appropriate type of variable output type DC constant current circuit device having an electric current from the same variable output type DC constant current circuit device having an integrated circuit configuration at any time by selecting a command signal to be input to a terminal. Is possible. (2) In the above item (1), in the output current value adjusting circuit section, the switching element is turned on when the command signal input to the terminal is at a low level, whereby the current value adjusting transistor is turned on. By having a configuration that is turned on, the terminal provided in the appropriate output current value adjustment circuit unit,
For example, by connecting to the ground potential by a well-known method such as wire bonding, the same variable output type DC constant current circuit device configured as an integrated circuit can be used to output a variable output type DC constant current circuit having an appropriate output current. It is possible to obtain a constant current circuit device. Furthermore, (3) In (1) or (2) above, the driven transistor included in the current mirror circuit device section and the current value adjusting transistors included in all the output current value adjusting circuit sections are integrated circuits. By arranging them so that they are arranged close to each other in the device, the driven transistor and all the current value adjusting transistors are under almost the same conditions in a wafer process step or the like when manufacturing an integrated circuit device. Produced. Therefore, since the driven transistor and all the current value adjusting transistors can have the output current value performance according to the area of the channel portion, the output current value of the variable output type DC constant current circuit device is
It is possible to obtain with high accuracy due to the ratio substantially according to the area of the channel portion.

[0018]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a circuit diagram showing a variable output type DC constant current circuit device according to an embodiment of the present invention with a part of the main part omitted. In FIG. 1, the same parts as those of the fixed output type DC constant current circuit device shown in FIG. 2 and the conventional variable output type DC constant current circuit device shown in FIG. The description is omitted. In addition, in FIG.
The trimming circuit section 5 and the constant current bias circuit device section 7 shown in FIG. 3 are not shown, and the reference numerals given in FIGS. 2 and 3 are only representative reference numerals.

In FIG. 1, reference numeral 1 denotes an output current with respect to the fixed output type DC constant current circuit device 9A shown in FIG. 2 and the conventional variable output type DC constant current circuit device 9 shown in FIG. This is a variable output type DC constant current circuit device in which a plurality of value adjusting circuit units 2 (two in FIG. 1 are provided) are additionally provided. Output current value adjusting circuit unit 2 (When distinguishing each of the plurality of output current value adjusting circuit units 2, as shown in FIG. 1, the reference sign 2 is followed by the reference signs A and B.) Are pMOS3 and pMOS31 which are transistors for current value adjustment, and a known transmission gate (hereinafter, T
It may be abbreviated as G. ) 4, an inverter 41,
pMOS 42. The drain, which is one of the main poles of the pMOS 3, is connected to the drain, which is one of the main poles of the pMOS 63 included in the current mirror circuit device unit 6. Therefore, the pMOS 3 is connected to the pMOS 63 in parallel with each other. become.

The TG 4 is connected between the gate, which is the control pole of the pMOS 3, and the interconnection point of the gates, which are the control poles of the pMOS 62 and pMOS 63, respectively. The drain of the pMOS 42 is connected to the input terminal of the inverter 41 and the gate of the pMOS forming the TG 4, and the gate of the pMOS 42 is grounded. p
The interconnection point between the drain of the MOS 42, the input terminal of the inverter 41, and the gate of the pMOS forming the TG 4 is also connected to the signal input terminal 2a. The output terminal of the inverter 41 is connected to the gate of the nMOS forming the TG 4 and the gate of the pMOS 31. The pMOS 31 whose gate is connected to the output terminal of the inverter 41 has its main poles connected to the power supply and the pMOS 31.
3 is connected to the gate of the inverter 3, and the potential level of the output terminal of the inverter 41 is low level (hereinafter, may be abbreviated as “L”) TG4 is in the off state. , And holds the gate potential of the pMOS3 at a high level (hereinafter, may be abbreviated as "H") to reliably hold the off state of the pMOS3.

In the embodiment shown in FIG. 1, the pMOS 42 is always turned on because of the above-mentioned structure, so that no signal is input to the terminals 2a of the output current value adjusting circuit section 2. In this case, the potential of the gate of the pMOS forming the TG 4 and the input terminal of the inverter 41 becomes “H”. For this reason, TG4, and therefore pMOS3, are turned off, and the output current I ₁ output from the DC constant current circuit device 1 is only the current I ₉ supplied from the current mirror circuit device portion 6.

In this state, when the signal "L" is input to the terminal 2Aa which is the terminal 2a of the output current value adjusting circuit 2A, the gate of the pMOS forming the TG 4 and the input of the inverter 41 are input. Since the potential at the end switches to “L”, the pM of the output current value adjusting circuit unit 2A
When the gate potential of OS3 becomes "L", this pM
OS3 is a pMO included in the current mirror circuit device unit 6.
It is turned on by the drive signal itself given to S63. In this case, the output current I ₁ output from the DC constant current circuit device 1 is the current I ₉ supplied from the current mirror circuit device unit 6, and the current I _2A supplied from the output current value adjusting circuit unit 2A. Will join.

Instead of the output current value adjusting circuit section 2A,
The terminal that is the terminal 2a of the output current value adjustment circuit unit 2B.
When inputting the signal of "L" to the child 2Ba, the DC constant current circuit
Output current I output from device 1₁The current mirror times
Current I supplied from the path device unit 6₉To adjust the output current value
The current I supplied from the circuit section 2B_2BWill be added.
Further, as a matter of course, the output current value adjusting circuit units 2A, 2
Input the signal of "L" to each terminal 2a of B at the same time.
Output, output current I output from the DC constant current circuit device 1
₁Is supplied from the current mirror circuit device unit 6.
Flow I₉The output current value adjusting circuit 2A and the output current value
The current I supplied from the adjusting circuit unit 2B_2A, I _2BWill be added
It becomes

Then, when the "L" signal is input to the terminal 2a, the current value output from the pMOS 3 is determined by the description in the section of the action, so p
It is directly controlled by the channel area of the MOS3.
Therefore, each output current value adjusting circuit section 2A, 2B ...
By setting the area of the channel portion of the pMOS3 included in the device in correspondence with a desired output current value, a plurality of desired output currents I ₁ having different values are output from the DC constant current circuit device 1. It is possible. The DC constant current circuit device 1 is, of course,
It may be manufactured as an integrated circuit device using a process.

The characteristic of the DC constant current circuit device 1 according to the present invention that it is possible to output a plurality of desired output currents I ₁ having different values is that adjustment of characteristics from the outside after completion is completed. This is extremely effective in the case of the DC constant current circuit device 1 having an integrated circuit configuration, which is not easy. When the DC constant current circuit device 1 having an integrated circuit configuration is housed in a package, the terminals 2a of the output current value adjusting circuit units 2A, 2B, ... It may be connected to the terminal by a known appropriate method such as wire bonding. Then, the value of the output current I ₁ to be output from the DC constant current circuit device 1 is switched by changing the output current value adjusting circuit units 2A, 2B ...
The signal "L" is applied to the terminal 2a of the terminal or the external terminal to which the terminal 2a is connected, so that the operation can be performed easily and reliably. This is the same even in the case of an integrated circuit device incorporating the DC constant current circuit device 1.

By the way, in the case of the DC constant current circuit device 1 having the integrated circuit structure housed in the package, the terminals 2a of the respective output current value adjusting circuit portions 2A, 2B ...
It can be manufactured inside the package, for example, by a known wire bonding method so as to be connected to the ground potential. In this case, the pMOS 3 included in the output current value adjusting circuit unit 2 whose terminal 2a is connected to the ground potential by wire bonding or the like always outputs the output current I ₂ . Therefore, by appropriately selecting the output current value adjusting circuit unit 2 whose terminal 2a is connected to the ground potential by wire bonding or the like, the same direct current having an integrated circuit configuration including a plurality of output current value adjusting circuit units 2 can be obtained. From the constant current circuit device 1 or the DC constant current circuit device 1 built in the integrated circuit device having the same configuration,
The output currents I ₁ having different values can be output without applying an external signal. Also,
A part of the terminal 2a of each output current value adjusting circuit section 2A, 2B ... Is connected to the ground potential inside the package of the integrated circuit device, and the rest is connected to the external terminal provided in the package. Of course, it is also possible.

In the DC constant current circuit device 1, p
If the MOS 63 and the pMOS 3 included in all the output current value adjusting circuit units 2 are arranged close to each other in the integrated circuit device, the pMOS 63 can be used in a wafer process or the like when manufacturing the integrated circuit device.
And all pMOS3 are manufactured under almost the same conditions. Therefore, since the pMOS 63 and all the pMOSs 3 can have the output current value performance according to the area of the channel part, the value of the output current I ₁ of the DC constant current circuit device 1 is almost equal to that of the channel part. Since it is possible to obtain the ratio in accordance with the area, the accuracy of the value of the output current I ₁ can be improved.

In the above description of the embodiments, the trimming circuit portion 5 which also includes the variable output type DC constant current circuit device 9 of the conventional example has not been mentioned, but the DC constant current circuit device 1 does not include the trimming circuit. Of course, the part 5 may be provided. By providing the trimming circuit section 5, the accuracy of the value of the output current I ₁ can be further improved as described in the section of the conventional example while providing the operation and effect of the above-described embodiment. At that time, the effect of adjusting the value of the output current I ₁ by the trimming circuit unit 5 is applied to the pMOS 63 and all the pMOSs 3 at the same ratio. As a result, the trimming circuit unit 5 outputs I
_By adjusting the value of ₉ , it is possible to obtain the preferable feature that the values of the plurality of types of output currents I ₁ of the DC constant current circuit device 1 can be adjusted simultaneously and with the same accuracy. .

In the above description of the embodiment, the pMOS3 is turned on when the signal applied to the terminal 2a of the output current value adjusting circuit unit 2 is "L", and the pMOS3 is turned on when there is no signal. Although it is supposed to be turned off, the present invention is not limited to this. For example, the installation of the pMOS 42 in the output current value adjusting circuit section is stopped, and the on / off switching of the TG 4 is switched to “L” of the signal input to the terminal 2 a.・
It may be performed by "H".

In the above description of the embodiment, p
The MOS3 is said to be turned on when the signal applied to the terminal 2a of the output current value adjusting circuit unit 2 is "L", and turned off when there is no signal or "H", but is not limited to this. However, if the signal given to the terminal 2a is "H", for example, by inserting an inverter in the transmission path of the signal connected to the terminal 2a, the pMOS
3 may be turned on, and the pMOS 3 may be turned off when it is "L".

In the above description of the embodiments, the TGs 4 included in the respective output current value adjusting circuit units are electrically connected in parallel with each other, but the present invention is not limited to this, and each of them may be, for example, each. The TGs 4 included in the output current value adjusting circuit unit may be electrically connected to each other in series. However, in this case, in order to turn on the TG4, it is necessary to sequentially turn on from the TG4 connected to the current mirror circuit device section 6 side.
When turning off the TG4, it is necessary to sequentially turn off the TG4 on the side farthest connected to the current mirror circuit device section 6.

Furthermore, in the above description of the embodiment, the DC constant current circuit device 1 is manufactured by using the CMOS process, and all the transistors used are MOS.
However, the invention is not limited to this.
For example, the DC constant current circuit device 1 is manufactured using a Bi-CMOS process, and the transistors used are Bi-
It may be a MOS.

[0033]

According to the present invention, the following effects can be obtained by adopting the structure described in the section of the means for solving the above problems. It is possible to obtain different output currents at any time by switching the command signal given to the terminal for inputting the control signal from the same variable output type DC constant current circuit device configured as an integrated circuit. Further, it is possible to obtain a plurality of DC constant current circuit devices having different output current values from the same variable output type DC constant current circuit device having an integrated circuit configuration. Furthermore, it becomes possible to adjust the output current values of all the output current value adjusting circuit sections by only adjusting the output current value from the current mirror circuit device section. As a result, it is possible to reduce the manufacturing cost related to the adjustment of the output current value.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a variable output type DC constant current circuit device according to an embodiment of the present invention with a part of the main part omitted.

FIG. 2 is a circuit diagram showing a main part of a fixed output type DC constant current circuit device.

FIG. 3 is a circuit diagram showing a main part of a variable output type DC constant current circuit device of a conventional example.

[Explanation of reference numerals] 1 DC constant current circuit device 2 Output current value adjusting circuit unit 2a terminal 3 pMOS 31 pMOS 4 Transmission gate (TG) 41 Inverter 42 pMOS 6 Current mirror circuit device unit 62 pMOS 63 pMOS

Claims (3)

[Claims] 1. A circuit device configured as an integrated circuit device, comprising a semiconductor element that operates as a reference transistor and a semiconductor element that operates as a driven transistor,
A current mirror circuit device unit in which control poles of both transistors are connected to each other, and an output terminal connected to one main pole of a driven transistor of the current mirror circuit device unit, and one main pole of the driven transistor In the variable output type DC constant current circuit device that outputs a DC constant current whose value is variable and is proportional to the value of the reference current flowing from the output terminal to the main pole of the reference transistor via the One or a plurality of output current value adjusting circuit units each having a current value adjusting transistor connected in parallel are provided. The output current value adjusting circuit unit includes the current value adjusting transistor and the transistor for adjusting the current value. A switch connected between the control pole and the interconnection point of each control pole of both transistors of the current mirror circuit device section. It has a switching element and a terminal for inputting a command signal that commands opening and closing of this switching element, and the transistor for current value adjustment is turned on / off in accordance with the command content of the command signal input to the terminal. The variable output DC constant current is characterized in that the value of the DC constant current output from the output terminal is changed by turning on / off the current value adjusting transistor of the output current value adjusting circuit unit. Circuit device. 2. The variable output type DC constant current circuit device according to claim 1, wherein the output current value adjusting circuit unit turns on the switching element when the command signal input to the terminal is at a low level, and A variable output type DC constant current circuit device in which a transistor for adjusting a current value is turned on by the. 3. The variable output type DC constant current circuit device according to claim 1, wherein the driven transistor included in the current mirror circuit device section and the current value adjusting transistors included in all the output current value adjusting circuit sections. Is a variable output type DC constant current circuit device, which is arranged close to each other in the integrated circuit device.