NJM431
ADJUSTABLE PRECISION SHUNT REGULATOR
■
GENERAL DESCRIPTION
The NJM431 is a 3 terminal adjustable shunt regulator. The output
voltage may be set to any value between V
REF
(about 2.5V) and 36V
by two resistors. Output circuitry shows a sharp turn-on
characteristics. Applications include shunt regulators, series
regulators for small power and isolation regulators with photo
couplers.
■
FEATURES
•
Operating Voltage (V
KA
= V
REF
to 36V)
•
Fast Turn-On Response
•
Cathode Current (1mA to 100mA)
•
Low Dynamic Output Impedance
(0.2Ωtyp.)
•
Load Regulation typically (0.1%)
•
Package Outline DIP8, DMP8, SOT-89
•
Bipolar Technology
■
PIN CONFIGURATION
■
PACKAGE OUTLINE
NJM431D
(DIP8)
NJM431M
(DMP8)
NJM431U
(SOT-89)
NJM431D
NJM431M
NJM431U
■
EQUIVALENT CIRCUIT
Ver.2012-06-15
-1-
NJM431
■
BLOCK DIAGRAM
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Cathode Voltage (note)
Continuous Cathode Current
Reference Input Current
Power Dissipation
Operating Temperature
Storage Temperature Range
SYMBOL
V
KA
I
K
I
REF
P
D
T
opr
T
stg
RATINGS
37
-100 to 150
-0.05 to 10
(DIP8)
(DMP8)
(SOT89)
-40 to +85
-40 to +125
700
300
350
(T
a
=25°C)
UNIT
V
mA
mA
mW
mW
mW
ºC
ºC
(note) Unless specified, all voltage value are with respect to the anode terminal.
■
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
K
MIN.
V
REF
1
TYP.
-
-
MAX.
36
100
UNIT
V
mA
■
ELECTRICAL CHARACTERISTICS
(T
a
=25ºC)
PARAMETER
Reference Voltage
Reference Voltage Change
(Full Oper. Temp. Range)
Reference Voltage Change
vs. Cathode Voltage Change
Reference Input Current
Reference Input Current Change
(Full Oper. Temp. Range)
Minimum Input Current
Cathode Current (Off Cond.)
Dynamic Impedance
(note 1) TEST CIRCUIT (Fig. 1)
(note 2) TEST CIRCUIT (Fig. 2)
(note 3) TEST CIRCUIT (Fig. 3)
SYMBOL
V
REF
V
REF
(dev)
∆V
REF
∆V
KA
I
REF
I
REF
(dev)
I
MIN
I
OFF
|Z
KA
|
TEST CONDITION
V
KA
= V
REF
, I
K
= 10mA (note 1)
V
KA
= V
REF
, I
K
= 10mA (note 1)
Ta = -20ºC to +85 ºC
I
K
= 10mA (note 2)
∆V
KA
= 10V - V
REF
∆V
KA
= 36V - 10V
I
K
= 10mA, R1 = 10kΩ, R2 =
∞
(note 2)
I
K
= 10mA, R1 = 10kΩ, R2 =
∞
(note 2)
Ta = -20ºC to +85 ºC
V
KA
= V
REF
(note 1)
V
KA
= 36V, V
REF
= 0 (note 3)
V
KA
= V
REF
, I
K
= 1mA to 100mA,
f
≤
1kHz (note 1)
MIN.
2440
-
-
-
-
-
-
-
-
TYP.
2495
8
-1.4
-1
2
0..4
0.4
0.1
0.2
MAX.
2550
17
-2.7
-2
4
1.2
1.0
1.0
0.5
UNIT
mV
mV
mV/V
mV/V
µA
µA
mA
µA
Ω
-2-
Ver.2012-06-15
NJM431
■
TEST CIRCUITS
1. V
KA
= V
REF
V
O
= V
KA
= V
REF
(Fig. 1)
■
TYPICAL APPLICATION
(1) Shunt Regulator
2.
V
KA
> V
REF
V
O
= V
KA
= V
REF
·
⎛
1
+
R1
⎞
+ I
REF
·R1
⎜
⎟
⎝
R2
⎠
3.
I
OFF
(Fig. 2)
(2) Series Regulator
(Fig. 3)
(3) Output Control of a Three-Terminal
fixed Regulator
(4) Constant Current Source
■
POWER DISSIPATION VS. AMBIENT TEMPERATURE
800
Power Dissipation P
D
(mW)
NJM431D
7mW/°C
600
400
NJM431U
3.5mW/°C
NJM431M
3mW/°C
200
0
0
25
50
75
Ambient Temperature Ta (°C)
100
Ver.2012-06-15
-3-
NJM431
■TYPICAL
CHARACTERISTICS
Reference Voltage
Reference Voltage
Reference Input Current
V
REF
(dev)
No. 1
No. 2
No. 3
No. 4
No. 5
(Ta = -20 to 25°C)
+5mV
0mV
0mV
-2mV
-5mV
(Ta = 25 to 85°C)
+1mV
0mV
-6mV
-9mV
-12mV
(Ta = 25°C)
2525mV
2501mV
2481mV
2468mV
2456mV
Reference Voltage
I
REF
(dev)
No.1 -0.38µA
No.2 -0.27µA
No.3 -0.21µA
Safety Operating Boundary Condition
Dynaminc Impedance
Note) Oscillation might occure while operating
within the range of safety curve.
So that, it is necessary to make ample
margins by taking considerations of
fluctuation of the device.
-4-
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2012-06-15
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