TL431/TL431A. Programmable Shunt Regulator. Description. Features

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1 Programmable Shunt Regulator Features Programmable output voltage to 36 volts Low dynamic output impedance 0.20 typical Sink current capability of 1.0 to 100mA Equivalent full-range temperature coefficient of 50ppm/ C typical Temperature compensated for operation over full rated operating temperature range Low output noise voltage Fast turn-on response Description The are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2W Active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement for zener diodes in many applications. TO Ref 2. Arode 3. Cathode 8-DIP 8-SOP 1 1. Cathode Arode 1 8. Ref NC

2 Internal Block Diagram Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Symbol Value Unit Cathode Voltage VKA 37 V Cathode current Range (Continuous) IKA -100~ ma Reference Input Current Range IREF 0.05~ + 10 ma Power Dissipation D, Z Suffix Package N Suffix Package Recommended Operating Conditions PD Operating Temperature Range TOPR -25 ~ + 85 o C Storage Temperature Range TSTG -65 ~ o C Parameter Symbol Min Typ Max Unit Cathode Voltage VKA VREF - 36 V Cathode Current IKA ma mw mw

3 Electrical Characteristics (TA = +25 C, unless otherwise specified) Parameter Symbol Conditions TMIN= -25 o C, TMAX= +85 o C TL431 TL431A Min. Typ. Max. Min. Typ. Max. Reference Input Voltage VREF VKA=VREF, IKA=10mA V Deviation of Reference Input Voltage Over- Temperature (Note 1) Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off - Stage Cathode Current Dynamic Impedance (Note 2) VREF/ T VREF/ VKA IREF IREF/ T VKA=VREF, IKA=10mA TMIN TA TMAX IKA =10mA IKA=10mA, R1=10KΩ,R2= IKA=10mA, R1=10KΩ,R2= TA =Full Range VKA=10V- VREF VKA=36V- 10V Unit mv mv/v µa µa IKA(MIN) VKA=VREF ma IKA(OFF) ZKA VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA f 1.0KHz µa Ω 上海毅钧商贸

4 Test Circuits Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKA VREF Figure 3. Test Circuit for lka(off)

5 Typical Perfomance Characteristics Figure 1. Cathode Current vs. Cathode Voltage Figure 2. Cathode Current vs. Cathode Voltage Figure 3. Change In Reference Input Voltage vs. Cathode Voltage Figure 4. Dynamic Impedance Frequency Figure 5. Small Signal Voltage Amplification vs. Frequency Figure 6. Pulse Response

6 Typical Application V O 1 R 1 = Vref R 2 V O V ref 1 R 1 = R 2 V O 1 R 1 = Vref R 2 MC7805/LM7805 Figure 10. Shunt Regulator Figure 11. Output Control for Three- Termianl Fixed Regulator Figure 12. High Current Shunt Regulator Figure 13. Current Limit or Current Source Figure 14. Constant-Current Sink

7 Mechanical Dimensions Package TO MAX 0.46 ± TYP [1.27 ±0.20] 1.02 ± TYP [1.27 ±0.20] 3.60 ±0.20 (R2.29) (0.25) ± ±

8 Mechanical Dimensions (Continued) Package 8-DIP # ± ±0.008 # ( ) ± ± ±0.10 #4 # ± ± MAX ± MAX 3.40 ± ± MIN 3.30 ± ± ~

9 Mechanical Dimensions (Continued) Package 8-SOP 1.55 ± ±0.008 MIN 0.1~ ~0.001 #1 # MAX 4.92 ± ± ( ) #4 # ± ± ± ± ± ± MAX MAX0.10 MAX ~ ± ±0.008

10 Ordering Information Product Number Output Voltage Tolerance Package Operating Temperature TL431ACLP TO-92 1% TL431ACD 8-SOP TL431CLP TO ~ + 85 o C TL431CP 2% 8-DIP TL431CD 8-SOP

KA431/KA431A/KA431L. Programmable Shunt Regulator. Features. Description. Internal Block Diagram.

KA431/KA431A/KA431L. Programmable Shunt Regulator. Features. Description. Internal Block Diagram. www.fairchildsemi.com KA431/KA431A/KA431L Programmable Shunt Regulator Features Programmable output voltage to 36 volts Low dynamic output impedance 0.20 typical Sink current capability of 1.0 to 100mA