BL431_17 BELLING | Alldatasheet
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P a g e w w w b e llin g c om c n ADJUSTABLE PRECISION ZENER SHUNT REGULATOR BL431
DESCRIPTION
a three terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between V R E F (approximately and V with two external resistors. This device has typical dynamic output impedance of 0 . 2 Ω Active output circuitry provides a very sharp turn on characteristic, making these devices excellent replacement for zener diodes in many applications. FEATURE Programmable output voltage to V Low dynamic output impedance 0 . 2 Ω typical Sink current capability of mA to 100 mA Equivalent full range temperature coefficient of 50 ppm/ typical Temperature compensated for operation over full rated operating temperature range Low output noise voltage Fast turn on response BLOCK DIAGRAM PIN CONNECTION S O T T O
P a g e w w w b e llin g c om c n SOT23 Marking ABSOLUTE MAXIMUM RATINGS Operating temperature range applies unless otherwise specified.) Characteristic Symbol Value Unit Cathode Voltage Vka V Cathode Current Range (continuous) Ika 150 mA Reference Input Current Range I R E F mA Power Dissipation P D TO 770 mW SOT 230 Operating Temperature Range Topr Store temperature Range Tstg 150 ELECTRICAL CHARACTERISTICS (Ta= unless otherwise specified)
P a g e w w w b e llin g c om c n I R E F V R E F Parameter Conditions Symbol Min Typ Max Unit TO Reference Voltage Vz= V R E F Ii= mA V R E F 2.487 2.500 2.513 V 2.475 525 440 2.55 SOT V R E F 482 495 508 V 470 520 440 2.55 Deviation of Reference Input Voltage Over Temperature Vz= V R E F Ii= mA Vdev 8.0 mV Ratio of the Change in Reference Voltage to the Change in Cathode Voltage Iz= mA Vz= V R E F V Δ V R E F Δ Vz m V Vz= V Reference Input Current R k Ω R mA I R E F 2.0 4.0 μ A Deviation of Reference Input Current Over Temperature R k Ω R mA I R E F 0.4 1.2 μ A Minimum Cathode Current for Regulation Vz= V R E F Iz( min) 0.4 1.0 mA Off State Current Vz= V R E F V Iz(off) 1.0 μ A Dynamic Output Impedance Vz= V R E F Iz= to 100 mA, k Hz Rz Ω TEST CIRCUIT I I I I IN IN R 1 I REF Iz Iz R 2 Vz IN Iz OFF Note: Vz= V R E F R I R E F Test circuit for Vz= V R E F 2.Test circuit for Vz> V R E F 3 . Test circuit for off state current V R E F
P a g e w w w b e llin g c om c n L M R 1 R 2 V R E F APPLICATION CIRCUIT Vo Vo 1+R1/R2 V REF Vo = ( 1+R1/R2 V REF Shunt Regulator 2 . Series Regulator IN Vth=2.5V OUT Von=2V Voff=V+ Vo = ( 1+R1/R2 ) V REF Vo M IN V REF + 5 V GND 3 . Output Control of a Three 4 . Single Supply Comparator with Terminal Fixed Regulator Temperature Compensated Threshold 5 . Higher Current Shunt Regulator 6 . Crow Bar Vo Vo R 1 R 2 Vo=(1 R )*V R E F Vlimit=(1 R )*V R E F u F R 1 Vo R 2 IN 780 OUT C O MM O N Vo R 1 R 2
P a g e w w w b e llin g c om c n CHARACTERISTIC CURVES
P a g e w w w b e llin g c om c n STABILITY BOUNDARY CONDITIONS: Test Circuit for Stability Boundary:
P a g e w w w b e llin g c om c n Appendix TO Package Outline Dimension TO
P a g e w w w b e llin g c om c n SOT Package Outline Dimension Taping Diagram
P a g e w w w b e llin g c om c n