TL431

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. SOT-23 TO-92 (TOP VIEW) 1. SOT-89 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 REFERENCE CATHODE CATHODE(K) 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) CHARACTERISTIC Cathode Voltage Continuous Cathode Current Range Reference Input Current Range Junction Temperature Operating Temperature Storage Temperature Total Power Dissipation SYMBOL VKA IKA IREF TJ TOPR TSTG PD RATING 37 -100~+150 0.05~10 150 -20 ~ 85 -65 ~ 150 700 UNIT V ㎃ ㎃ ℃ ℃ ℃ ㎽ TL431-0.3% ELECTRICAL CHARACTERISTIC (TA=25℃, unless otherwise specified) 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 IKAMIN 1 ΔVKA=VREF 0.5 1 ㎃ ΔIREF/ΔT 2 IREF 2 ΔVREF/ΔVKA SYMBOL CIR-CUIT VREF 1 TEST CONDITION VKA=VREF, IK=10㎃ VKA=VREF, IK=10㎃ MIN. TYP. MAX. UNIT 2.487V 2.495V 2.502V ΔVREF/ΔT 1 TA=Full Range 3 17 ㎷ ΔVKA=10V-V REF 2 IK=10㎃ ΔVKA=36V-10V IKA=10㎃, R1=10㏀, R2=∞ IK=10㎃, R1=10㏀, R2=∞ TA=Full Range -1.4 -2.7 ㎷/V -1 1.8 -2 4 ㎂ 0.4 1.2 ㎂ IKAOFF 3 VKA=36V, V REF=0 0.2 1 ㎂ ZKA 1 VKA=VREF, IK=1㎃~100㎃, f≤1㎑ 0.2 0.5 Ω 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 (TA=25℃, unless otherwise specified) MIN. TYP. MAX. UNIT 2.48 2 V 2 .495V 2.507V 3 17 ㎷ 1 TEST CONDITION VKA=VREF, IK=10㎃ VKA=VREF, IK=10㎃ TA=Full Range ΔVKA=10V-V REF -1.4 -1 1.8 0.4 -2.7 ㎷/V -2 4 1.2 ㎂ ㎂ ΔVREF/ΔVKA 2 IK=10㎃ ΔVKA=36V-10V 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㎑ IREF ΔIREF/ΔT 2 2 IKAMIN IKAOFF ZKA 1 3 1 0.5 0.2 0.2 1 1 0.5 ㎃ ㎂ Ω 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 SYMBOL CIR-CUIT VREF 1 ΔVREF/ΔT (TA=25℃, unless otherwise specified) MIN. TYP. MAX. 2.47V 2 .495V 2.52V 3 17 UNIT 1 TEST CONDITION VKA=VREF, IK=10㎃ VKA=VREF, IK=10㎃ TA=Full Range ΔVKA=10V-V REF ㎷ -1.4 -1 1.8 0.4 -2.7 ㎷/V -2 4 1.2 ㎂ ㎂ ΔVREF/ΔVKA I IREF ΔIREF/ΔT 2 IK=10㎃ ΔVKA=36V-10V 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㎑ 2 2 IKAMIN IKAOFF ZKA 1 3 1 0.5 0.2 0.2 1 1 0.5 ㎃ ㎂ Ω ３ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES Fig. 1 Test Circuit for V KA =V REF Fig. 2 Test Circuit for V KA ≥V REF INPUT IKA VKA INPUT IKA VKA R1 DUT ＩREF DUT VREF R2 VREF VKA=VREF(1+R1/R2)+IREF R1 Fig. ３ Test Circuit for IKA （off) INPUT IKA VKA DUT ４ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE† 2600 2580 2560 2540 VREF-REFERENCE VOLTAGE2520 VREF=25㎷‡ 2500 2480 2460 VREF=2440㎷‡ 2440 2420 2400 -75 -50 -25 0 25 50 75 100 125 0 -75 -50 -25 0 25 50 75 100 125 VREF=2500㎷‡ 4 VREF-REFERENCE VOLTAGE5 R1=10㏀ R2=∞ IKA=10㎃ REFERENCE CURRENT vs FREE-AIR TEMPERATURE † 3 2 1 TA-FREE-AIR TEMPERATURE-℃ TA-FREE-AIR TEMPERATURE-℃ † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. ‡ Data is for devices having the indicated value of REF at IKA=10㎷, V TA=25℃ † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. Figure 4. CATHODE CURRENT vs CATHODE VOLTAGE 150 125 100 IKA-CATHODE CURRENT75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 3 -200 -1 0 0 IKA-CATHODE CURRENTVKA=VREF TA=25℃ 600 800 VKA=VERF TA=25℃ Figure 5. CATHODE CURRENT vs CATHODE VOLTAGE IMIN 400 200 1 2 3 VKA-CATHODE VOLTAGE-V VKA-CATHODE VOLTAGE-V Figure 6. Figure 7. ５ JinYu semiconductor www.htsemi.com Ｄａｔｅ：２０１１／０５ TL431 PROGRAMMABLE PRECISION REFERENCES TYPICAL PERFORMANCE CHARACTERISTICS OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE† 2.5 VKA=36 V 2 IOFF-OFFSTATE CATHODE CURRENT -0.95 -0.85 VKA=3V TO 36V RATIO DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE † 1.5 ΔVREF/ΔV -㎷/V KA -75 -25 0 25 50 75 100 125 -1.05 -1.15 1 -1.25 0.5 -1.35 0 -50 -1.45 -75 -50 -25 0 25 50 75 100 125 TA-FREE-AIR TEMPERATURE-℃ TA-FREE-AIR TEMPERATURE-℃ † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. † Data is applicable only within the recommended operating free-air temperature ranges of the various devices. Figure 8. EQUIVALENT INPUT NOISE VOLTAGE VS FREQUENCY 260 240 VIN-EQUIVALENT NOISE VOLTAGE-㎵ 220 IO=10㎃ TA=25℃ Figure 9. 200 180 160 140 120 100 10 100 1K f-FREQUENCY-㎐ 10K 100K 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℃ 1㏀ ｜ZKA｜-REFERENCE IMPEDANCE OUTPUT 10 ~ 50Ω + IKA 1 GND Test Circuit for Reference Impedance 0.1 1K 10K 100K f-FREQUENCY-㎐ 1M 10M Figure 11. REFERENCE IMPEDANCE VS FREQUENCY 6 TA=25℃ 5 INPUT 220Ω OUTPUT PULSE GENERATOR f=100㎑ OUTPUT ｜ZKA｜-REFERENCE IMPEDANCE 4 50Ω 3 2 GND 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) VI(BATT) R1 0.1% VREF R2 0.1% RETURN TL431 VO =（1+ VO R1 V ） REF R2 NOTE A : R Should provide cathode current≥1㎃ to the TL431 at minimum VI(BATT) Figure 13. Shunt Regulator VI(BATT) TL431 INPUT VIT ~ 2.5V ~ VO VON ~ 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