TL431 PROGRAMMABLE PRECISION REFERENCES FEATURES FUNCTION BLOCK DIAGRAM.
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1 PROGRAMMABLE PRECISION REFERENCES The TL43 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.2ω. Active output circuitry provides a very sharp turn-on characteristic, making this device excellent replacement for zener diodes in many application. FEATURES Equivalent Full Range Temperature Coefficient 5PPM/ Temperature Compensated For Operation Over Full Rate Operating Temperature Range Adjustable Output Voltage Fast Turn-on Response Sink Current Capability ma to ma Low (.2Ω Typ.) Dynamic Output Impedance Low Output Noise TO-92 (TOP VIEW). SOT-23 SOT REF 2. ANODE 3. CATHODE FUNCTION BLOCK DIAGRAM BLOCK DIAGRAM REFERENCE CATHODE CATHODE(K) 2.5V REF REFERENCE(R) ANODE(A) ANODE
2 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 V KA I REF RATING 37 UNIT V -~+5 ma.5~ ma T J 5 T OPR T STG -65 ~ 5 P D -2 ~ 85 7 mw TL43-.3% ELECTRICAL CHARACTERISTIC (, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. UNIT V REF Reference Input Voltage V KA =V REF, I K =ma Deviation of Reference V KA =V REF, I K = ma 2.487V 2.495V 2.52V Input Voltage Over ΔV REF /ΔT T A =Full Range Full Temperature Range Ratio of Change in ΔV KA =V-V REF Reference Input Voltage ΔV REF /ΔV KA 2 I K =ma to the Change in Cathod ΔV KA =36V-V Voltage Reference Input Current I REF 2 =ma, =kω, R2= Deviation of Reference I K =ma, =kω, R2= Input Current Over Full ΔI REF /ΔT 2 T A =Full Range Temperature Range mvmv /V μaμa Minimum Cathode ΔV KA =V REF MIN Current for Regulation Off-State Cathode V KA =36V, V REF = OFF 3 Current Dynamic Impedance V KA =V REF, I K =ma ~ma, Z KA f khz.5 ma.2 μa.2.5 Ω
3 TL43-.5%ELECTRICAL CHARACTERISTIC (, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. Reference Input Voltage V REF V KA =V REF, I K =ma 2.482V 2.495V 2.57V Deviation of Reference V KA =V REF, I K =ma Input Voltage Over ΔV REF /ΔT T A =Full Range 3 7 Full Temperature Range Ratio of Change in ΔV KA =V-V REF Reference Input Voltage ΔV REF /ΔV KA 2 I K =ma to the Change in Cathod ΔV KA =36V-V - -2 Voltage Reference Input Current I REF 2 =ma, =kω, R2=.8 4 Deviation of Reference I K =ma, =kω, R2= Input Current Over Full ΔI REF /ΔT 2 T A =Full Range.4.2 Temperature Range Minimum Cathode ΔV KA =V I REF KA MIN Current for Regulation Off-State Cathode V KA =36V, V REF = OFF 3 Current Dynamic Impedance V KA =V REF, I K =ma ~ma, Z KA f khz UNIT mvmv /V μaμamaμa Ω TL43-%ELECTRICAL CHARACTERISTIC (, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. Reference Input Voltage V REF V KA =V REF, I K =ma 2.47V 2.495V 2.52V Deviation of Reference V KA =V REF, I K =ma Input Voltage Over ΔV REF /ΔT T A =Full Range 3 7 Full Temperature Range Ratio of Change in ΔV KA =V-V REF Reference Input Voltage ΔV REF /ΔV KA 2 I K =ma to the Change in Cathod I ΔV KA =36V-V - -2 Voltage Reference Input Current I REF 2 =ma, =kω, R2=.8 4 Deviation of Reference I K =ma, =kω, R2= Input Current Over Full ΔI REF /ΔT 2 T A =Full Range.4.2 Temperature Range Minimum Cathode ΔV KA =V I REF KA MIN Current for Regulation.5 Off-State Cathode V KA =36V, V REF = OFF 3 Current.2 Dynamic Impedance V KA =V REF, I K =ma ~ma, Z KA f khz.2.5 UNIT mvmv /V μaμamaμa Ω
4 Fig. Test Circuit for V KA =V REF Fig. 2 Test Circuit for V KA V REF INPUT V KA INPUT V KA DUT I REF DUT V REF R2 V REF V KA =V REF (+/R2)+I REF Fig. 3 Test Circuit for (off) INPUT V KA DUT
5 TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE REFERENCE CURRENT vs FREE-AIR TEMPERATURE = kω R2= = ma VREF-REFERENCE VOLTAGE-mV VREF-REFERENCE CURRENT-uA T A -FREE-AIR TEMPERATURE T A -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 V REF at =ma, Figure 4. Figure 5. CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE V KA =V REF V KA =V ERF IKA-CATHODE CURRENT-mA IKA-CATHODE CURRENT-uA I MIN V KA -CATHODE VOLTAGE-V V KA -CATHODE VOLTAGE-V Figure 6. Figure 7.
6 TYPICAL PERFORMANCE CHARACTERISTICS 2.5 V KA =36 V OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE -.85 V KA =3V TO 36V RATIO DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE IOFF-OFFSTATE CATHODE CURREN T ΔVREF/ΔVKA- mv /V T A -FREE-AIR TEMPERATURE T A -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 I O = ma VIN-EQUIVALENT NOISE VOLTAGE- nv K K K f-frequency- Hz Figure.
7 TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE IMPEDANCE VS FREQUENCY ZKA -REFERENCE IMPEDANCE = ma ~ kω 5Ω - + OUTPUT GND Test Circuit for Reference Impedance. K K K M M f-frequency- Hz Figure. REFERENCE IMPEDANCE VS FREQUENCY 6 INPUT 5 22Ω OUTPUT ZKA -REFERENCE IMPEDANCE OUTPUT PULSE GENERATOR f= khz 5Ω GND Test Circuit for Pulse Response t-time- μs Figure 2.
8 TL43 APPLICATION INFORMATION R (SEE NOTE A) VO VI(BATT).% VREF TL43 VO = + VREF R2 R2.% RETURN NOTE A : R Should provide cathode current to the TL43 at minimum VI(BATT) Figure 3. Shunt Regulator VI(BATT) IN LM785 OUT VO COMMON VO = + TL43 V R2 REF MINIMUM V O=VREF+5V R2 Figure 4. Output Control of a 3-Terminal Fixed Regulator VO VI(BATT) VO = + R2 RETURN R2 VREF TL43 Figure 5. High-Current Shunt Regulator 8 Date 2011 05
Shenzhen Tuofeng Semiconductor Technology Co., Ltd
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