RH5RE21AC-T1 [RICOH]
VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT; 电压调节器中输出电流
| 型号： | RH5RE21AC-T1 |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | VOLTAGE REGULATOR FOR MIDDLE OUTPUT CURRENT |
| 文件： | 总20页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
VOLTAGE REGULATOR
FOR MIDDLE OUTPUT CURRENT
R×5RE SERIES
APPLICATION MANUAL
NO.EA-016-0006
VOLTAGE REGULATOR
FOR MIDDLE OUTPUT CURRENT
R×5RE SERIES
OUTLINE
The R×5RE Series are voltage regulator ICs with high output voltage accuracy and ultra-low quiescent
current by CMOS process. Each of these ICs consists of a voltage reference unit, an error amplifier, a driver
transistor, and resistors for setting output voltage, and a current limit circuit. By use of these ICs, a con-
stant voltage power supply circuit with high efficiency can be constructed because the dropout voltage and
quiescent current of these ICs are very small. Furthermore, theses ICs have a built-in current limit circuit.
The output voltage of these ICs is fixed with high accuracy.
Two types of packages, TO-92 and SOT-89 (Mini-power Mold) are available.
FEATURES
• Ultra-low Quiescent Current
...........................
TYP. 1.1µA (R×5RE30A,VIN=5.0V)
TYP. 0.5V (R×5RE50A,IOUT=60mA)
TYP. 120mA (R×5RE50A)
...............................
• Ultra-low Dropout Voltage
......................................
• Large Output Current
...........................
• Low Temperature-Drift Coefficient of Output Voltage
TYP. ±100ppm/˚C
......................
• Broad Operating Voltage Range
MAX. 10.0V
................................
• Excellent Line Regulation
TYP. 0.1%/V
±2.5%
........................
• High Accuracy Output Voltage
...................................................
• Output Voltage
Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is
possible (refer to Selection Guide)
..................................
• Two Types of Packages
TO-92, SOT-89 (Mini-power Mold)
APPLICATIONS
• Power source for battery-powered equipment.
• Power source for cameras, video instruments such as camcorders, VCRs, and hand- held communication equipment.
• Precision voltage references.
BLOCK DIAGRAM
VIN
VOUT
2
3
+
–
Vref
1
GND
1
R×5RE
SELECTION GUIDE
The package type, the output voltage, the packing type, and the taping type of R×5RE Series can be
designated at the user's request by specifying the part number as follows.
R×5RE××××–×× ← Part Number
↑
↑ ↑ ↑
↑
a
b c d
e
Code
Contents
Designation of Package Type:
E: TO-92
a
H: SOT-89 (Mini-power Mold)
Setting Output Voltage (VOUT):
Stepwise setting with a step of 0.1V in the range of 2.0V to 6.0V is possible.
b
c
A
Designation of Packing Type:
A: Taping
C: Antistatic bag for TO-92 and samples
d
e
Designation of Taping Type:
Ex. TO-92 : RF, RR, TZ
SOT-89: T1, T2
(refer to Taping Specifications)
“TZ” and “T1” are prescribed as a standard.
For example, the product with Package Type SOT-89,Output Voltage 5.0V,Version A and Taping Type T1 are
designated by Part Number RH5RE50AA-T1.
2
R×5RE
PIN CONFIGURATION
• TO-92
• SOT-89
(mark side)
(mark side)
2
1
3
1
2
3
PIN DESCRIPTION
• TO-92
• SOT-89
Pin No.
Symbol
Pin No.
Symbol
GND
VIN
1
2
3
GND
VIN
1
2
3
VOUT
VOUT
3
R×5RE
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
+12
Unit
V
VIN
Input Voltage
VOUT
IOUT
PD
Output Voltage
–0.3 to VIN+0.3
300
V
Output Current
mA
mW
˚C
Power Dissipation
300
Topt
Tstg
Operating Temperature
Storage Temperature
Lead Temperature (Soldering)
–40 to +85
–55 to +25
260˚C, 10s
˚C
Tsolder
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any
conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above
these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress
ratings only and do not necessarily imply functional operation below these limits.
4
R×5RE
ELECTRICAL CHARACTERISTICS
Topt=25˚C
Symbol
VOUT
IOUT
Item
Output Voltage
Output Current
Conditions
VIN=4.0V,IOUT=10mA
VIN=4.0V
MIN.
1.950
40
TYP.
2.000
60
MAX.
Unit
2.050
V
mA
∆VOUT
∆IOUT
VIN=4.0V
Load Regulation
40
80
mV
1mA≤IOUT≤50mA
VDIF
ISS
Dropout Voltage
IOUT=30mA
VIN=4.0V
0.5
1.0
0.7
3.0
V
Quiescent Current
µA
∆VOUT
∆VIN
IOUT=10mA
Line Regulation
0.1
%/V
VOUT+1.0V≤VIN≤10V
VIN
Input Voltage
Current Limit
10
V
Ilim
240
mA
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
±100
ppm/˚C
–40˚C≤Topt≤85˚C
• R×5RE30A
Topt=25˚C
Symbol
VOUT
IOUT
Item
Output Voltage
Output Current
Conditions
VIN=5.0V,IOUT=10mA
VIN=5.0V
MIN.
2.925
50
TYP.
3.000
80
MAX.
Unit
3.075
V
mA
∆VOUT
∆IOUT
VIN=5.0V
Load Regulation
40
80
mV
1mA≤IOUT≤60mA
VDIF
ISS
Dropout Voltage
IOUT=40mA
VIN=5.0V
0.5
1.1
0.7
3.3
V
Quiescent Current
µA
∆VOUT
∆VIN
IOUT=10mA
Line Regulation
0.1
%/V
VOUT+1.0V≤VIN≤10V
VIN
Input Voltage
Current Limit
10
V
Ilim
240
mA
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
±100
ppm/˚C
–40˚C≤Topt≤85˚C
5
R×5RE
• R×5RE40A
Topt=25˚C
Symbol
VOUT
IOUT
Item
Output Voltage
Output Current
Conditions
VIN=6.0V,IOUT=10mA
VIN=6.0V
MIN.
3.900
65
TYP.
4.000
100
MAX.
Unit
4.100
V
mA
∆VOUT
∆IOUT
VIN=6.0V
Load Regulation
40
80
mV
1mA≤IOUT≤70mA
VDIF
ISS
Dropout Voltage
IOUT=50mA
VIN=6.0V
0.5
1.2
0.7
3.6
V
Quiescent Current
µA
∆VOUT
∆VIN
IOUT=10mA
Line Regulation
0.1
%/V
VOUT+1.0V≤VIN≤10V
VIN
Input Voltage
Current Limit
10
V
Ilim
240
mA
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
±100
ppm/˚C
–40˚C≤Topt≤85˚C
• R×5RE50A
Topt=25˚C
Unit
Symbol
VOUT
IOUT
Item
Output Voltage
Output Current
Conditions
VIN=7.0V,IOUT=10mA
VIN=7.0V
MIN.
4.875
80
TYP.
5.000
120
MAX.
5.125
V
mA
mV
∆VOUT
∆IOUT
VIN=7.0V
Load Regulation
40
80
1mA≤IOUT≤80mA
VDIF
ISS
Dropout Voltage
IOUT=60mA
VIN=7.0V
0.5
1.3
0.7
3.9
V
Quiescent Current
µA
∆VOUT
∆VIN
IOUT=10mA
Line Regulation
0.1
%/V
VOUT+1.0V≤VIN≤10V
VIN
Input Voltage
Current Limit
10
V
Ilim
240
mA
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
±100
ppm/˚C
–40˚C≤Topt≤85˚C
6
R×5RE
• R×5RE60A
Topt=25˚C
Unit
Symbol
VOUT
IOUT
Item
Output Voltage
Output Current
Conditions
VIN=8.0V,IOUT=10mA
VIN=8.0V
MIN.
5.850
80
TYP.
6.000
120
MAX.
6.150
V
mA
∆VOUT
∆IOUT
VIN=8.0V
Load Regulation
40
80
mV
1mA≤IOUT≤80mA
VDIF
ISS
Dropout Voltage
IOUT=60mA
VIN=8.0V
0.5
1.4
0.7
4.2
V
Quiescent Current
µA
∆VOUT
∆VIN
IOUT=10mA
Line Regulation
0.1
%/V
VOUT+1.0V≤VIN≤10V
VIN
Input Voltage
Current Limit
10
V
Ilim
240
mA
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
±100
ppm/˚C
–40˚C≤Topt≤85˚C
7
R×5RE
ELECTRICAL CHARACTERISTICS BY OUTPUT VOLTAGE
Output Voltage
VOUT(V)
OutputCurrent
IOUT(mA)
Load Regulation
Dropout Voltage
VDIF(V)
∆VOUT/∆IOUT(mV)
Part Number
Conditions
MIN.
TYP.
MAX.
Conditions
MIN.
TYP.
Conditions
TYP.
MAX.
Conditions
TYP.
MAX.
×
R 5RE20A
1.950 2.000 2.050
2.048 2.100 2.152
2.145 2.200 2.255
2.243 2.300 2.357
2.340 2.400 2.460
2.438 2.500 2.562
2.535 2.600 2.665
2.633 2.700 2.767
2.730 2.800 2.870
2.828 2.900 2.972
2.925 3.000 3.075
3.023 3.100 3.177
3.120 3.200 3.280
3.218 3.300 3.382
3.315 3.400 3.485
3.413 3.500 3.587
3.510 3.600 3.690
3.608 3.700 3.792
3.705 3.800 3.895
3.803 3.900 3.997
3.900 4.000 4.100
3.998 4.100 4.202
4.095 4.200 4.305
4.193 4.300 4.407
4.290 4.400 4.510
4.388 4.500 4.612
4.485 4.600 4.715
4.583 4.700 4.817
4.680 4.800 4.920
4.778 4.900 5.022
4.875 5.000 5.125
4.973 5.100 5.227
5.070 5.200 5.330
5.168 5.300 5.432
5.265 5.400 5.535
5.363 5.500 5.637
5.460 5.600 5.740
5.558 5.700 5.842
5.655 5.800 5.945
5.753 5.900 6.047
5.850 6.000 6.150
VIN–
VOUT
=2.0V
×
R 5RE21A
×
R 5RE22A
1mA≤
IOUT
×
R 5RE23A
×
R 5RE24A
≤50mA
IOUT
40
60
×
R 5RE25A
=30mA
×
R 5RE26A
VIN–
VOUT
=2.0V
×
R 5RE27A
×
R 5RE28A
×
R 5RE29A
×
R 5RE30A
1mA≤
IOUT
×
R 5RE31A
×
R 5RE32A
≤60mA
×
R 5RE33A
×
R 5RE34A
IOUT
50
80
×
R 5RE35A
=40mA
VIN
–
×
R 5RE36A
VIN–
VOUT
=2.0V
VOUT
VIN–
VOUT
=2.0V
×
R 5RE37A
=2.0V
×
R 5RE38A
×
R 5RE39A
40
80
0.5
0.7
×
R 5RE40A
×
R 5RE41A
1mA≤
IOUT
IOUT
×
R 5RE42A
=10mA
×
R 5RE43A
≤70mA
×
R 5RE44A
IOUT
65
100
×
R 5RE45A
=
50mA
×
R 5RE46A
×
R 5RE47A
×
R 5RE48A
×
R 5RE49A
VIN–
VOUT
=2.0V
×
R 5RE50A
×
R 5RE51A
×
R 5RE52A
×
R 5RE53A
×
R 5RE54A
1mA≤
IOUT
IOUT
×
R 5RE55A
80
120
=60mA
×
R 5RE56A
≤80mA
×
R 5RE57A
×
R 5RE58A
×
R 5RE59A
×
R 5RE60A
8
R×5RE
Topt=25˚C
Line Regulation Input Voltage Current Limit Output Voltage Tempco.
∆VOUT/∆VIN(%/V) VIN(V) Ilim(mA) ∆VOUT/∆T(ppm/˚C)
Quiescent Current
Iss(µA)
Conditions
TYP.
MAX.
Conditions
TYP.
MAX.
TYP.
Conditions
TYP.
1.0
3.0
3.3
1.1
IOUT
=10mA
IOUT
=10mA
VIN–
1.2
3.6
0.1
10
240
±100
VOUT
=2.0V
VOUT+
1.0V≤
VIN
–40˚C≤
Topt
≤85˚C
≤10V
1.3
3.9
1.4
4.2
9
R×5RE
OPERATION
Output Voltage VOUT divided at the node between
Registers R1 and R2 is compared with Reference Voltage
by Error Amplifier, so that a constant voltage is output.
VOUT
VIN
Error Amplifire
–
R1
R2
+
Vref
GND
GND
FIG. 1 Brock Diagram
TEST CIRCUITS
ISS
IOUT
VIN
VIN
VOUT
R×5RE
SERIES
R×5RE
SERIES
VOUT
VIN
VIN
VOUT
CI
1µF
CI
+
1µF
Co
1µF
+
+
GND
GND
FIG. 2 Test Circuit
FIG. 3 Quiescent Current Test Circuit
VIN
VOUT
R×5RE
SERIES
VOUT
+
GND
Co
Ro
P.G
0.1µF
FIG. 4 Line Transient Response Test Circuit
10
R×5RE
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R×5RE30A
R×5RE40A
VIN=5.0V
VIN=6.0V
3.1
4.1
4.0
3.9
3.8
3.7
Topt= –40˚C
Topt=–40˚C
3.0
25˚C
25˚C
2.9
85˚C
2.8
85˚C
2.7
0
250
50
100
0
50
100
150
200
150
200
Output Current IOUT(mA)
Output Current IOUT(mA)
R×5RE50A
R×5RE50A
VIN=7.0V
VIN=7.0V
Topt=–40˚C
5.1
5.0
4.9
4.8
4.7
5.1
with heatsink
5.0
4.9
25˚C
without heatsink
85˚C
4.8
4.7
heatsink
30×30×1mm
0
50 100 150 200 250 300 350
Output Current IOUT(mA)
0
50
100
150
200 250
Output Current IOUT(mA)
2) Output Voltage vs. Input Voltage
R×5RE20A
Topt=25˚C
Topt=25˚C
2.4
2.04
2.02
2.00
2.2
IOUT=1µA
2.0
1.8
IOUT=1µA
1.6
10mA
10mA
1.4
1mA
1.2
1.98
1.96
1mA
1.0
0.8
1.0
2.0
3.0
4.0
5.0
2
3
4
5
6
7
Input Voltage VIN(V)
Input Voltage VIN(V)
11
R×5RE
R×5RE30A
R×5RE30A
Topt=25˚C
Topt=25˚C
3.4
3.2
3.0
3.00
2.99
2.98
2.97
IOUT=1µA
IOUT=1mA
2.8
2.6
1mA 10mA
50mA
2.4
2.2
2.0
1.8
2.96
2.95
10mA
2.0
2.5
3.0
3.5
4.0
4.5
3.0
4.0
5.0
6.0
7.0
8.0
Input Voltage VIN(V)
Input Voltage VIN(V)
R×5RE40A
R×5RE40A
Topt=25˚C
Topt=25˚C
4.2
4.0
3.8
3.6
4.06
4.04
IOUT=1mA
4.02
4.00
IOUT=1µA
10mA
50mA
10mA
1mA
3.4
3.2
3.98
3.96
2.5
3.5
4.5
5.5
4
5
6
7
8
9
Input Voltage VIN(V)
Input Voltage VIN(V)
R×5RE50A
R×5RE50A
Topt=25˚C
Topt=25˚C
5.1
5.0
4.8
5.05
5.04
5.03
IOUT=1mA
5.02
5.01
5.00
10mA
50mA
IOUT=1µA
4.6
4.4
4.2
4.99
4.98
4.97
1mA
10mA
4.96
4.95
4.0
4.5
5.0
5.5
6.0
6.5
5
6
7
8
9
10
Input Voltage VIN(V)
Input Voltage VIN(V)
12
R×5RE
3) Dropout Voltage vs. Output Curret
R×5RE30A
R×5RE40A
1.4
1.0
0.8
0.6
0.4
0.2
0.0
1.2
85˚C
85˚C
1.0
0.8
25˚C
25˚C
0.6
0.4
0.2
0.0
Topt=–40˚C
Topt=–40˚C
0
20
40
60
80
100
0
20
40
60
80
100
Output Current IOUT(mA)
Output Current IOUT(mA)
R×5RE50A
0.8
0.7
0.6
85˚C
0.5
0.4
25˚C
0.3
0.2
0.1
0.0
Topt= –40˚C
0
20
40
60
80
100
Output Current IOUT(mA)
4) Output Voltage vs.Temperature
R×5RE30A
R×5RE40A
IOUT=10mA
IOUT=10mA
4.1
3.1
4.0
3.0
2.9
3.9
-50 -30 -10 10 30 50 70 90
Temperature Topt(˚C)
-50 -30 -10 10 30 50 70 90
Temperature Topt(˚C)
13
R×5RE
R×5RE50A
IOUT=10mA
5.2
5.1
5.0
4.9
4.8
-50 -30 -10 10 30 50 70 90
Temperature Topt(˚C)
5) Quiescent Current vs. Input Voltage
R×5RE20A
R×5RE30A
Topt=25˚C
1.1
Topt=25˚C
1.4
1.3
1.0
0.9
0.8
1.2
1.1
1.0
0.7
0.6
3
4
5
6
7
8
9
10
2
3
4
5
6
7
8
9
10
Input Voltage VIN(V)
Input Voltage VIN(V)
R×5RE50A
R×5RE40A
Topt=25˚C
Topt=25˚C
1.5
1.5
1.4
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
1.3
1.2
1.1
1.0
4
5
6
7
8
9
10 11
5
6
7
8
9
10 11 12
Input Voltage VIN(V)
Input Voltage VIN(V)
14
R×5RE
6) Quiescent Current vs. Temperature
R×5RE30A
R×5RE20A
VIN=4.0V
VIN=5.0V
1.6
1.7
1.5
1.3
1.4
1.2
1.1
0.9
0.7
0.5
1.0
0.8
–40 –20
0
20 40 60 80 100
–40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
R×5RE40A
R×5RE50A
VIN=6.0V
VIN=7.0V
1.7
1.5
1.4
1.3
1.2
1.1
1.5
1.3
1.1
0.9
0.7
0.5
1.0
0.9
0.8
0.7
0.6
0.5
–40 –20
0
20 40 60 80 100
–40 –20
0
20 40 60 80 100
Temperature Topt(˚C)
Temperature Topt(˚C)
7) Dropout Voltage vs. Set Output Voltage
R×5RE SERIES
Topt=25˚C
0.7
0.6
0.5
IOUT=50mA
0.4
0.3
0.2
10mA
0.1
1mA
0.0
0
1
2
3
4
5
6
Set Output Voltage Vreg(V)
15
R×5RE
8) Line Transient Response (1)
R×5RE20A
R×5RE30A
IOUT=1mA
IOUT=1mA
7.0
6.0
5.0
5.0
4.5
4.5
3.5
3.0
2.5
2.0
Input Voltage
Input Voltage
4.0
3.0
Output Voltage
Output Voltage
2.0
1.0
1.5
1.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
Time t(ms)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
Time t(ms)
R×5RE40A
R×5RE50A
IOUT=1mA
IOUT=1mA
9.0
8.0
8.0
7.0
6.0
5.0
4.0
3.0
7.0
6.0
5.0
4.0
3.0
2.0
Input Voltage
Input Voltage
Output Voltage
Output Voltage
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Time t(ms)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
Time t(ms)
9) Line Transient Response (2)
R×5RE20A
R×5RE30A
IOUT=30mA
IOUT=30mA
5.0
4.5
7.0
6.0
5.0
4.0
Input Voltage
3.5
3.0
Input Voltage
2.5
4.0
3.0
Output Voltage
Output Voltage
2.0
1.5
1.0
0.5
2.0
1.0
0.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
1.5 2.0 2.5 3.0 3.5 4.0 4.5
Time t(ms)
Time t(ms)
16
R×5RE
R×5RE40A
R×5RE50A
IOUT=30mA
IOUT=30mA
9.0
8.0
7.0
6.0
5.0
4.0
3.0
8.0
7.0
6.0
Input Voltage
Input Voltage
5.0
4.0
Output Voltage
Output Voltage
3.0
2.0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Time t(ms)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
Time t(ms)
17
R×5RE
TYPICAL APPLICATION
In R×5RE Series, a constant voltage can be obtained
without using Capacitors C1 and C2. However, when the
wire connected to VIN is long, use Capacitor C1. Output
noise can be reduced by using Capacitor C2.
VIN
VOUT
R×5RE
SERIES
VIN
VOUT
GND
+
+
C1
C2
GND
Insert Capacitors C1 and C2 with the capacitance of
0.1µF to 2.0µF between Input/Output Pins and GND Pin
with minimum wiring.
GND
APPLICATION CIRCUITS
• VOLTAGE BOOST CIRCUIT
The output voltage can be obtained by the follow-
ing formula :
1
VIN
VOUT
R×5RE
SERIES
*
VOUT=Vreg · (1+R2/R1) + ISS · R2
VIN
VOUT
Since the quiescent current of R×5RE Series is so
small that the resistances of R1 and R2 can be set as
large as several hundreds kΩ and therefore the sup-
ply current of “Voltage Boost Circuit” itself can be
reduced.
+
GND
C2
R1
ISS
+
C1
GND
R2
Furthermore, since R×5RE Series are operated by
a constant voltage, the supply current of “Voltage
Boost Circuit” is not substantially affected by the
input voltage.
1) Vreg : Set Output Voltage of R×5RE Series.
*
• DUAL POWER SUPPLY CIRCUIT
As shown in the circuit diagram, a dual power sup-
ply circuit can be constructed by using two R×5RE
Series.
IC1
VIN
VOUT
VOUT1
VIN
R×5RE20A
5V
+
C1
This circuit diagram shows a dual power supply
circuit with an output of 3V and an output of 5V.
When the minimum output current of IC2 is larger
than ISS of IC1, Resistor R is unnecessary. Diode D is
a protection diode for the case where VOUT2
becomes larger than VOUT1.
D
R
ISS
GND
IC2
VOUT
VIN
+
VOUT2
3V
R×5RE30A
+
C3
C2
GND
GND
GND
18
R×5RE
• CURRENT BOOST CIRCUIT
Output current of 120mA or more can be obtained
by the current boost circuit constructed as shown in
this circuit diagram.
Tr.1
VIN
VOUT
R×5RE
SERIES
VIN
VOUT
GND
+
+
C1
C2
GND
GND
• CURRENT BOOST CIRCUIT WITH OVERCURRENT LIMIT CIRCUIT
A circuit for protecting Tr.1 from the destruction
caused by output short-circuit or overcurrent is shown in
this circuit diagram.
Tr.1
R2
Vbe2
When the voltage reduction caused by the current (
IOUT) which flows through R2 reaches Vbe2 of Tr.2 by
additionally providing the current boost circuit with Tr.2
and R2, Tr.2 is turned ON and the base current of Tr.1 is
increased, so that the output current is limited.
Current limit of Overcurrent Limit Circuit is obtained
as follows :
Tr.2
IOUT
VIN
VOUT
R×5RE
SERIES
VIN
R1
VOUT
+
+
C2
GND
GND
GND
IOUT
Vbe2/R2
• CURRENT SOURCE
A current source with the structure as shown in
this circuit diagram can be used. Output Current
IOUT is obtained as follows :
IOUT
VIN
VOUT
R×5RE
SERIES
VIN
1
*
R
IOUT=Vreg /R + ISS
GND
+
Take care that Output Current IOUT does not exceed
its allowable current.
ISS
C1
1) Vreg : Set Output Voltage of R×5RE Series.
*
19
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