ADJUSTABLE PRECISION SHUNT REGULATOR
FSP431
FEATURES
Equivalent Full-Range Temperature Coefficient : 30 ppm/℃ 0.2ΩTypical Output Impedance Sink-Current Capability :1 mA to 100 mA Low Output Noise Adjustable Output Voltage :Vref to 36 V TO92-3L, SOT23-3L Package
GENERAL DESCRIPTION
The FSP431 is three-terminal adjustable shunt regulators with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V with two external resistors. These devices have a typical output impedance of 0.2Ω . Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. (2) SOT23-3L
PIN CONFIGURATION
(1) TO92-3L (Top View) (Top View)
CATHODE ANODE REF
BLOCK DIAGRAM
SYMBOL
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FSP431
EQUIVALENT SCHEMATIC
Note: All component values are nominal.
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Parameter Cathode Voltage, VKA (Note 2) Continuous Cathode Current Range, IKA Reference Input Current Range Operating Temperature Rating 37 -100 to 150 -50µA to 10mA 0 to 70 °C Unit V mA
Storage Temperature -65 to 150 °C Note 1: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings’ may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in specifications is not implied and prolonged exposure to extreme conditions may affect device reliability. Note 2: Voltage values are with respect to the anode terminal unless otherwise noted.
RECOMMENDED OPERATING CONDITIONS
Parameter Cathode Voltage, VKA Cathode Current, IKA Operating Temperature, TA Rating Vref to 36 1 to 100 0 to 70 Unit V mA °C
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FSP431
ELECTRICAL CHARACTERISTICS
(TA=25°C, Unless otherwise noted) PARAMETER SYMBOL Reference Voltage VREF Deviation of reference voltage over full temperature range VI(dev) (see Figure 1) Ratio of change in reference voltage to the change in cathode ∆VREF/∆VKA voltage Reference Current IREF Deviation of reference current II(dev) over full temperature range (see Figure 1) Minimum Cathode Current for IMIN regulation Off-state Cathode Current IOFF Dynamic Impedance ∣ZKA∣ (see Figure 1) TEST CONDITIONS VKA = VREF, IKA =10mA VKA = VREF, IKA =10mA TA= full range IKA =10mA ∆VKA =10V- VREF ∆VKA =36V- 10V MIN 2.47 TYP 2.495 4 -4.7 -1 2 0.8 0.4 0.1 0.2 MAX 2.52 25 -2.7 -2 4 1.2 0.6 0.5 0.5 UNIT V mV mV/V µA µA mA mA Ω
IKA =10mA, R1=10kΩ, R2=∞ IKA =10mA, R1=10kΩ, R2=∞ TA= full range VKA = VREF VKA =36V, VREF =0 IKA =1mA to 100Ma, VKA = VREF f≤1kHz
The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, Vref, is defined as:
Where : ∆TA is the recommended operating free-air temperature range of the device. αVref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively , occurs at the lower temperature. Example : maximum Vref=2.496V at 30°C, minimum Vref =2.492V at 0°C, Vref=2.495V at 25°C,
Because minimum Vref occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as: When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by:
Figure 1: Calculating Deviation Parameters and Dynamic Impedance
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FSP431
PARAMETER MEASUREMENT INFORMATION
Figure 2: Test Circuit for VKA=VREF
Figure 3: Test Circuit for VKA>VREF
Figure 4: Test Circuit for Ioff
APPLICATION INFORMATION
Note A: R should provide cathode current ≥ 1mA to the FSP431 at minimum.(VI(BATT)) Figure 5: shunt regulator
Figure 6: Single-Supply comparator with temperature-compensated threshold
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FSP431
Note A: R should provide cathode current ≥ 1mA to the FSP431 at minimum.(VI(BATT)) Figure 7: Precision high-current series regulator
Figure 8: Output control of a three terminal fixed regulator
Figure 9: High current shunt regulator
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FSP431
Note A: Refer to the stability boundary condition to determine allowable values for C. Figure 9: Crowbar Circuit
Figure 10: Precision 5V 1.5A regulator
Note A: Rb should provide cathode current ≥ 1mA to the FSP431. Figure 11: Efficient 5V precision regulator
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Figure 12: PWM converter with reference
Note A: R3 and R4 are selected to provide the desired LED intensity and cathode current ≥ 1mA to the FSP431 at the available.(VI(BATT)) Figure 13: Voltage monitor
Figure 14: Delay Timer
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FSP431
Figure 15: Precision current limiter
Figure 16: Precision constant-current sink
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FSP431
TYPICAL CHARACTERISTICS
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TYPICAL CHARACTERISTICS (CONTINUED)
FSP431
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ADJUSTABLE PRECISION SHUNT REGULATOR
TYPICAL CHARACTERISTICS (CONTINUED)
FSP431
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TYPICAL CHARACTERISTICS(CONTINUED)
FSP431
Test circuit for curve A
Test circuit for curve B, C and D
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FSP431
ORDERING INFORMATION
FSP431XXX Package: V: TO92-3L C: SOT23-3L Packing: Blank: Tube or Bulk A: Tape & Reel Temperature Grade: Blank: 0~70℃
MARKING INFORMATION
(1) TO92-3L (2) SOT23-3L
Logo
FSP431
YYWWXX
Part Number
SAYMX
Internal Code Date Code: Y: Year (1=2001) M: Month (1~9, O,N,D) Part Number: FSP431
Internal Code
Date Code: YY: Year (01=2001) WW: Nth week (01~52)
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FSP431
PACKAGE INFORMATION
(1) TO92-3L
A
A1
D
b1
b
E
L
Symbol A A1 b b1 D E L e
Min. 3.302 1.016 0.330 0.406 4.445 4.445 13.00 1.150
Dimensions In Millimeters Nom. Max. 3.556 3.810 0.381 0.457 4.572 4.572 1.270 0.432 0.506 4.699 4.699 15.50 1.390
Min. 0.130 0.040 0.013 0.016 0.175 0.175 0.512 0.045
Dimensions In Inches Nom. 0.140 0.015 0.018 0.180 0.180 0.050
e
Max. 0.150 0.017 0.020 0.185 0.185 0.610 0.055
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FSP431
(2) SOT23-3L
D
b
3
E1 E
e
A1
1 e1
2
A2
A
C θ L L1
Symbol A A1 A2 b C D E E1 L L1 e1 e θ
Dimensions In Millimeters Min. Max. 1.050 1.250 0.000 0.100 1.050 1.150 0.300 0.400 0.100 0.200 2.820 3.020 2.650 2.950 1.500 1.700 0.300 0.600 0.700REF 0.95 Bsc. 1.90 Bsc. 0º 8º
Dimensions In Inches Min. Max. 0.041 0.049 0.000 0.004 0.041 0.045 0.012 0.016 0.004 0.008 0.111 0.119 0.104 0.116 0.060 0.068 0.012 0.024 0.028REF 0.038 Bsc. 0.076 Bsc. 0º 8º
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