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| ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 FEATURES Equivalent Full-Range Temperature Coefficient 30 ppm/ 0.2Typical 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 0.2 . 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 1/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR 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 -50A 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 2/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 ELECTRICAL CHARACTERISTICS (TA=25C, 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 A A mA mA IKA =10mA, R1=10k, R2= IKA =10mA, R1=10k, R2= TA= full range VKA = VREF VKA =36V, VREF =0 IKA =1mA to 100Ma, VKA = VREF f1kHz 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. Vref 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 30C, minimum Vref =2.492V at 0C, Vref=2.495V at 25C, 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 3/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 PARAMETER MEASUREMENT INFORMATION Figure 2: Test Circuit for VKA=VREF Figure 3: Test Circuit for VKAVREF 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 4/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR 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 5/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR 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 6/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 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 7/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 Figure 15: Precision current limiter Figure 16: Precision constant-current sink 8/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 TYPICAL CHARACTERISTICS 9/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR TYPICAL CHARACTERISTICS (CONTINUED) FSP431 10/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR TYPICAL CHARACTERISTICS (CONTINUED) FSP431 11/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 TYPICAL CHARACTERISTICS(CONTINUED) Test circuit for curve A Test circuit for curve B, C and D 12/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR 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) 13/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR 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 14/15 2007-1-24 ADJUSTABLE PRECISION SHUNT REGULATOR FSP431 (2) SOT23-3L D b 3 E1 E e A1 1 e1 2 A2 A C L L1 Symbol A A1 A2 b C D E E1 L L1 e1 e 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. 0 8 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. 0 8 15/15 2007-1-24 |
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