TL431 PROGRAMMABLE PRECISION REFERENCES The TL431 is three-terminal adjustable shunt regulator with specified termal stability. The output voltage may be set to any value between V REF (Approx. 2.5V) and 36V with two external resistors. This device has a typical output inpedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making this device excellent replacement for zener diodes in many application. TO-92 (TOP VIEW) 1. SOT-89 SOT-23 FEATURES ● Equivalent Full Range Temperature Coefficient 50PPM/℃ ● Temperature Compensated For Operation Over Full Rate Operating Temperature Range ● Adjustable Output Voltage ● Fast Turn-on Response ● Sink Current Capability 1㎃ to 100㎃ ● Low (0.2Ω Typ.) Dynamic Output Impedance ● Low Output Noise 1 3. 1. 1. REF 2. ANODE 3. CATHODE FUNCTION BLOCK DIAGRAM BLOCK DIAGRAM CATHODE(K) CATHODE REFERENCE 2.5V REF REFERENCE(R) ANODE(A) ANODE １ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES ABSOLUTE MAXIMUM RATINGS (Full Operating Ambient Temperature Range Applies Unless Otherwise Noted) SYMBOL RATING UNIT Cathode Voltage VKA 37 V Continuous Cathode Current Range IKA -100~+150 ㎃ Reference Input Current Range IREF 0.05~10 ㎃ TJ 150 ℃ Operating Temperature TOPR -20 ~ 85 ℃ Storage Temperature TSTG -65 ~ 150 ℃ PD 700 ㎽ CHARACTERISTIC Junction Temperature Total Power Dissipation TL431-0.3% ELECTRICAL CHARACTERISTIC (TA=25℃, unless otherwise specified) CHARACTERISTIC Reference Input Voltage SYMBOL CIR-CUIT VREF 1 VKA=VREF, IK=10㎃ MIN. TYP. MAX. UNIT 2.487V 2.495V 2.502V VKA=VREF, IK=10㎃ Deviation of Reference Input Voltage Over TEST CONDITION ΔVREF/ΔT 1 TA=Full Range 3 17 -1.4 -2.7 ㎷ Full Temperature Range Ratio of Change in Reference Input Voltage ΔVKA=10V-V REF ΔVREF/ΔVKA 2 to the Change in Cathod IK=10㎃ ΔVKA=36V-10V Voltage Reference Input Current IREF 2 IKA=10㎃, R1=10㏀, R2=∞ -1 -2 1.8 4 ㎂ 0.4 1.2 ㎂ 0.5 1 ㎃ 0.2 1 ㎂ 0.2 0.5 Ω IK=10㎃, R1=10㏀, R2=∞ Deviation of Reference Input Current Over Full ㎷/V ΔIREF/ΔT 2 IKAMIN 1 IKAOFF 3 ZKA 1 TA=Full Range Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance ΔVKA=VREF VKA=36V, V REF=0 VKA=VREF, IK=1㎃~100㎃, f≤1㎑ ２ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TL431-0.5% ELECTRICAL CHARACTERISTIC CHARACTERISTIC Reference Input Voltage Deviation of Reference Input Voltage Over Full Temperature Range Ratio of Change in Reference Input Voltage to the Change in Cathod Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance SYMBOL CIR-CUIT VREF 1 ΔVREF/ΔT ΔVREF/ΔVKA 1 2 IREF 2 ΔIREF/ΔT 2 IKAMIN 1 IKAOFF 3 ZKA 1 TEST CONDITION VKA=VREF, IK=10㎃ VKA=VREF, IK=10㎃ TA=Full Range SYMBOL CIR-CUIT VREF 1 ΔVREF/ΔT 1 ΔVREF/ΔVKA I 2 IREF 2 ΔIREF/ΔT 2 IKAMIN 1 IKAOFF 3 ZKA 1 MIN. TYP. MAX. UNIT 2.48 2 V 2 .495V 2.507V ㎷ 3 17 ΔVKA=10V-V REF -1.4 -2.7 ΔVKA=36V-10V -1 -2 1.8 4 ㎂ 0.4 1.2 ㎂ 0.5 1 ㎃ 0.2 1 ㎂ 0.2 0.5 Ω IK=10㎃ ㎷/V IKA=10㎃, R1=10㏀, R2=∞ IK=10㎃, R1=10㏀, R2=∞ TA=Full Range ΔVKA=VREF VKA=36V, V REF=0 VKA=VREF, IK=1㎃~100㎃, f≤1㎑ TL431-1% ELECTRICAL CHARACTERISTIC CHARACTERISTIC Reference Input Voltage Deviation of Reference Input Voltage Over Full Temperature Range Ratio of Change in Reference Input Voltage to the Change in Cathod Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance (TA=25℃, unless otherwise specified) (TA=25℃, unless otherwise specified) TEST CONDITION VKA=VREF, IK=10㎃ VKA=VREF, IK=10㎃ TA=Full Range MIN. TYP. MAX. 2.47V 2 .495V 2.52V UNIT 3 17 ㎷ ΔVKA=10V-V REF -1.4 -2.7 ΔVKA=36V-10V -1 -2 1.8 4 ㎂ 0.4 1.2 ㎂ 0.5 1 ㎃ 0.2 1 ㎂ 0.2 0.5 Ω IK=10㎃ ㎷/V IKA=10㎃, R1=10㏀, R2=∞ IK=10㎃, R1=10㏀, R2=∞ TA=Full Range ΔVKA=VREF VKA=36V, V REF=0 VKA=VREF, IK=1㎃~100㎃, f≤1㎑ ３ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES Fig. 1 Test Circuit for V INPUT KA =V REF VKA IKA Fig. 2 Test Circuit for V INPUT R1 DUT R2 VREF KA ≥V REF VKA IKA ＩREF DUT VREF VKA=VREF(1+R1/R2)+IREF R1 Fig. ３ Test Circuit for IKA （off) VKA INPUT IKA DUT ４ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE† REFERENCE CURRENT vs FREE-AIR TEMPERATURE † 2600 5 R1=10㏀ R2=∞ IKA=10㎃ 2580 VREF=2500㎷‡ 2560 4 VREF-REFERENCE VOLTAGE- VREF-REFERENCE VOLTAGE- 2540 2520 VREF=25㎷‡ 2500 2480 2460 VREF=2440㎷‡ 3 2 2440 1 2420 2400 0 -75 -50 -25 0 25 50 75 100 125 -75 -50 TA-FREE-AIR TEMPERATURE-℃ -25 0 25 50 75 100 125 TA-FREE-AIR TEMPERATURE-℃ † Data is applicable only within the recommended operating free-air † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. temperature ranges of the various devices. ‡ Data is for devices having the indicated value of RVEF at IKA=10㎷, TA=25℃ Figure 4. Figure 5. CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 150 800 VKA=VERF TA=25℃ VKA=VREF TA=25℃ 125 600 IKA-CATHODE CURRENT- IKA-CATHODE CURRENT- 100 75 50 25 0 IMIN 400 200 -25 -50 0 -75 -100 -200 -2 -1 0 1 2 3 -1 0 1 VKA-CATHODE VOLTAGE-V VKA-CATHODE VOLTAGE-V Figure 6. Figure 7. 2 3 ５ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TYPICAL PERFORMANCE CHARACTERISTICS OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE† RATIO DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE † 2.5 -0.85 VKA=36 V VKA=3V TO 36V -0.95 -1.05 ΔVREF/ΔVKA-㎷/V IOFF-OFFSTATE CATHODE CURRENT 2 1.5 -1.15 1 -1.25 0.5 -1.35 0 -1.45 -75 -50 -25 0 25 50 75 100 125 -75 TA-FREE-AIR TEMPERATURE-℃ -50 -25 0 25 50 75 100 125 TA-FREE-AIR TEMPERATURE-℃ † Data is applicable only within the recommended operating free-air † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. temperature ranges of the various devices. Figure 8. Figure 9. EQUIVALENT INPUT NOISE VOLTAGE VS FREQUENCY 260 IO=10㎃ TA=25℃ VIN-EQUIVALENT NOISE VOLTAGE-㎵ 240 220 200 180 160 140 120 100 10 100 1K 10K 100K f-FREQUENCY-㎐ Figure 10. ６ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE IMPEDANCE VS FREQUENCY 100 IKA=10㎃ TA=25℃ ｜ZKA｜-REFERENCE IMPEDANCE 1㏀ OUTPUT 10 ~ IKA 50Ω + GND 1 Test Circuit for Reference Impedance 0.1 1K 10K 100K 1M 10M f-FREQUENCY-㎐ Figure 11. REFERENCE IMPEDANCE VS FREQUENCY 6 TA=25℃ INPUT 220Ω ｜ZKA｜-REFERENCE IMPEDANCE 5 OUTPUT 4 PULSE GENERATOR f=100㎑ 3 50Ω OUTPUT GND 2 1 Test Circuit for Pulse Response 0 -1 0 1 2 3 4 5 6 7 t-TIME-㎲ Figure 12. ７ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES APPLICATION INFORMATION R (SEE NOTE A) VO VI(BATT) R1 0.1% VREF TL431 VO =（1+ R1 ）VREF R2 R2 0.1% RETURN NOTE A : R Should provide cathode current≥1㎃ to the TL431 at minimum VI(BATT) Figure 13. Shunt Regulator VI(BATT) VO TL431 VON ~ ~ 2.5V INPUT VIT ~ ~ 2.5V VOFF ~ ~ VI(BATT) GND Figure 16. Single-Supply Comparator With Temperature-Compensated Threshold Figure 14. ８ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５