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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 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 Tum-On Respability * Cathode Current (1mA to 100mA) * Low Dynamic Output Impedance (0.2typ.) * Load Regulation typically (0.1%) * Package Outline DIP8, DMP8. TO-92. SOT-89 * Bipolar Technology PIN CONFIGURATION PACKAGE OUTLINE
NJM431D
NJM431M
1. REF 2. ANODE 3. CATHODE
NJM431L(TO-92)
NJM431U(SOT-89)
NJM431U NJM431L EQUIVALENT CIRCUIT
Ver.2003-07-18
-1-
NJM431
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
PARAMETER Cathode Voltage (note) Continuous Cathode Current Reference Input Current SYMBOL VKA IKA IREF RATINGS 37 -100 to 150 -0.05 to 10 (DIP8) (DMP8) (TO92) (SOT89) 700 300 500 350
(Ta=25C)
UNIT V mA mA mW mW mW mW C C
Power Dissipation
PD
Operating Temperature Storage Temperature Range
Topr Tstg
-40 to +85 -40 to +125
(note) Unless specified, all voltage value are with respect to the anode terminal.
RECOMMENDED OPERATING CONDITIONS
PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IK MIN. VREF 1 TYP. MAX. 36 100 UNIT V mA
ELECTRICAL CHARACTERISTICS (Ta=25C)
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 VREF VREF (dev) VREF VKA IREF IREF (dev) IMIN IOFF |ZKA| TEST CONDITION VKA = VREF, IK = 10mA (note 1) VKA = VREF, IK = 10mA (note 1) Ta = -20C to +85 C IK = 10mA (note 2) VKA = 10V - VREF VKA = 36V - 10V IK = 10mA, R1 = 10k, R2 = (note 2) IK = 10mA, R1 = 10k, R2 = (note 2) Ta = -20C to +85 C VKA = VREF (note 1) VKA = 36V, VREF = 0 (note 3) VKA = VREF, IK = 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 A A mA A
-2-
Ver.2003-07-18
NJM431
TEST CIRCUITS
1. VKA = VREF VO = VKA = VREF (Fig. 1) TYPICAL APPLICATION (1) Shunt Regulator
2.
VKA > VREF VO = VKA = VREF* 1 + R1 + IREF*R1
R2
3.
IOFF
(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
Ver.2003-07-18
-3-
NJM431
TYPICAL CHARACTERISTICS Reference Voltage Reference Voltage
Reference Input Current
VREF(dev) No. 1 No. 2 No. 3 No. 4 No. 5 (Ta = -20 to 25C) +5mV 0mV 0mV -2mV -5mV (Ta = 25 to 85C) +1mV 0mV -6mV -9mV -12mV (Ta = 25C) 2525mV 2501mV 2481mV 2468mV 2456mV
Reference Voltage
IREF(dev)
No.1 -0.38A No.2 -0.27A No.3 -0.21A
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.2003-07-18

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