NJM431
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ADJUSTABLE PRECISION SHUNT REGULATOR
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
The NJM431 is a 3 terminal adjustable shunt regulator. The output
voltage may be set to any value between VREF (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 (VKA = VREF to 36V)
• Fast Turn-On Response
• Cathode Current (1mA to 100mA)
• Low Dynamic Output Impedance (0.2typ.)
• Load Regulation typically (0.1%)
• Package Outline DIP8, DMP8, SOT-89
• Bipolar Technology
■ PIN CONFIGURATION
■ EQUIVALENT CIRCUIT
NJM431U
NJM431D
NJM431M
NJM431D (DIP8) NJM431M (DMP8)
NJM431U (SOT-89)
NJM431
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■ BLOCK DIAGRAM
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Cathode Voltage (note) VKA 37 V
Continuous Cathode Current IK -100 to 150 mA
Reference Input Current IREF -0.05 to 10 mA
Power Dissipation PD
(DIP8) 700
(DMP8) 300
(SOT89) 350
mW
mW
mW
Operating Temperature Topr -40 to +85 ºC
Storage Temperature Range Tstg -40 to +125 ºC
(note) Unless specified, all voltage value are with respect to the anode terminal.
■ RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Cathode Voltage VKA V
REF - 36 V
Cathode Current IK 1 - 100 mA
■ ELECTRICAL CHARACTERISTICS (Ta=25ºC)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Reference Voltage VREF V
KA = VREF, IK = 10mA (note 1) 2440 2495 2550 mV
Reference Voltage Change
(Full Oper. Temp. Range)
VREF
(dev)
VKA = VREF, IK = 10mA (note 1)
Ta = -20ºC to +85 ºC - 8 17 mV
VKA = 10V - VREF - -1.4 -2.7 mV/V
Reference Voltage Change
vs. Cathode Voltage Change
VREF
VKA
IK = 10mA (note 2)
VKA = 36V - 10V - -1 -2 mV/V
Reference Input Current IREF I
K = 10mA, R1 = 10k, R2 = (note 2) - 2 4 µA
Reference Input Current Change
(Full Oper. Temp. Range)
IREF
(dev)
IK = 10mA, R1 = 10k, R2 = (note 2)
Ta = -20ºC to +85 ºC - 0..4 1.2 µA
Minimum Input Current IMIN V
KA = VREF (note 1) - 0.4 1.0 mA
Cathode Current (Off Cond.) IOFF V
KA = 36V, VREF = 0 (note 3) - 0.1 1.0 µA
Dynamic Impedance |ZKA| VKA = VREF, IK = 1mA to 100mA,
f 1kHz (note 1) - 0.2 0.5
(note 1) TEST CIRCUIT (Fig. 1)
(note 2) TEST CIRCUIT (Fig. 2)
(note 3) TEST CIRCUIT (Fig. 3)
NJM431
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■ TEST CIRCUITS
1. VKA = VREF 2. V
KA > VREF 3. I
OFF
V
O = VKA = VREF V
O = VKA = VREF·⎟
⎠
⎞
⎜
⎝
⎛+R2
R1
1+ IREF·R1
(Fig. 1) (Fig. 2) (Fig. 3)
■ TYPICAL APPLICATION
(1) Shunt Regulator (2) Series Regulator
(3) Output Control of a Three-Terminal
fixed Regulator
(4) Constant Current Source
■ POWER DISSIPATION VS. AMBIENT TEMPERATURE
0
200
400
600
800
0 25 50 75 100
Ambient Temperature Ta (°C)
Power Dissipation PD (mW)
NJM431U
NJM431D
NJM431M
3mW/°C
3.5mW/°C
7mW/°C
NJM431
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■TYPICAL CHARACTERISTICS Reference Voltage
Reference Voltage
Reference Input Current
VREF(dev) (Ta = -20 to 25°C) (Ta = 25 to 85°C) (Ta = 25°C)
No. 1 +5mV +1mV 2525mV
No. 2 0mV 0mV 2501mV
No. 3 0mV -6mV 2481mV
No. 4 -2mV -9mV 2468mV
No. 5 -5mV -12mV 2456mV
Reference Voltage
IREF(dev)
No.1 -0.38µA
No.2 -0.27µA
No.3 -0.21µA
Safety Operating Boundary Condition Dynaminc Impedance
[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.
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.
