TA431 ETC1
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Technical content
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR TA 431
DESCRIPTION
The TA431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5V) and 36V with two external resistors. This device has typical dynamic output impedance of 0.2Ω. 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 36V Low dynamic output impedance 0.2Ωtypical Sink current capability of 1.0mA to 100mA Equivalent full-range temperature coefficient of 500ppm/℃ typical Temperature compensated for operation over full rated operating temperature range Low output noise voltage Fast turn on response EQUIVALENT CIRCUIT 12K 12K R4800 640 2.5K 3.3K Vref ANODE CATHODE Q3C1 C2 (Vz) (GND) ABSOLUTE MAXIMUM RATINGS
Operating temperature range applies unless otherwise specified.) Characteristic Symbol Value Unit Cathode Voltage Vka 37 V Cathode Current Range (continuous) Ika -10~+150 mA Reference Input Current Range IREF 10 mA Power Dissipation PD 770 mW Operating Temperature Range Topr 0~+70 ℃ Store temperature Range Tstg -65~+150 ℃ ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified) Parameter Conditions Symbol Min Typ Max Unit Reference Voltage Vz=VREF Ii=10mA 0.5% 1.0% 2.0% VREF 2.485 2.5 2.51 2.470 2.495 2.52 2.440 2.495 2.55 V Deviation of Reference Input Voltage Over Temperature Vz=VREF, Ii=10mA Vdev - 8.0 17 mV Ratio of the Change in Reference Voltage to the Change in Cathode Voltage Iz=10mA Vz=VREF~10V Vz=10~36V ΔVREF/ ΔVz - -1.4 -2.7 - -1.0 -2.0 mV/V Reference Input Current R1=10kΩ,R2=∞ I1=10mA IREF - 2.0 4.0 μA Deviation of Reference Input Current Over Temperature R1=10kΩ,R2=∞I1=10mA ΔIREF/ ΔT - 0.4 1.2 μA Minimum Cathode Current for Regulation Vz=VREF Iz(min) - 0.4 1.0 mA Off-State Current Vz=36V,VREF=0V Iz(off) - 0.3 1.0 μA Dynamic Output Impedance Vz=VREF, Iz=1 to 100mA,f<1.0kHz Rz - 0.15 0.5 Ω TEST CIRCUIT
Note: Vz=VREF(1+R1/R2)+IREF*R1 1.Test circuit for Vz=VREF 2.Test circuit for Vz>VREF 3.Test circuit for off-state current APPLICATION CIRCUIT V+ Vo REFV Vo = ( 1+R1/R2 ) VREF 0.01uF Vo Vo = ( 1+R1/R2 ) VREF 1. Shunt Regulator 2. Series Regulator IN OUT COMMON LM7805 Vo Vo = ( 1+R1/R2 ) VREF Vo M IN= VREF+ 5 V OUT IN Von=2V Voff=V+Vth=2.5V 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=(1+R1/R2)*VREF Vlimit=(1+R1/R2)*VREF CHARACTERISTIC CURVES Outline Drawing