Shenzhen Tuofeng Semiconductor Technology Co., Ltd
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1 TF PROGRAMMABLE PRECISION REFERENCES The is three-terminal adjustable shunt regulator with specified termal stability. The output voltage may be set to any value between (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 TO-92 (TOP VIEW) SOT FEATURES 1. REF 2. ANODE 3. CATHODE 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 ma to 100 ma Low (0.2Ω Typ.) Dynamic Output Impedance Low Output Noise FUNCTION BLOCK DIAGRAM BLOCK DIAGRAM REFERENCE CATHODE CATHODE(K) REFERENCE(R) ANODE(A) ANODE Oct Rev 03 1
2 TF 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 KA I REF RATING 37 UNIT V -100~+150 ma 0.05~10 ma T J 150 T OPR T STG -65 ~ 150 P D -20 ~ mw -0.3% ELECTRICAL CHARACTERISTIC (T A=25, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. UNIT Reference Input Voltage 1 V KA =, I K =10mA Deviation of Reference V KA =, I K =10 ma 2.487V 2.495V 2.502V Input Voltage Over Δ /ΔT 1 T A =Full Range Full Temperature Range Ratio of Change in ΔV KA =10V- Reference Input Voltage Δ /ΔV KA 2 I K =10mA to the Change in Cathod ΔV KA =36V-10V Voltage Reference Input Current I REF 2 I KA =10mA, =10kΩ, = Deviation of Reference I K =10mA, =10kΩ, = Input Current Over Full ΔI REF /ΔT 2 T A =Full Range Temperature Range mvmv /V μaμa Minimum Cathode ΔV KA = I KA MIN 1 Current for Regulation Off-State Cathode V KA =36V, =0 I KA OFF 3 Current Dynamic Impedance V KA =, I K =1mA ~100mA, Z KA 1 f 1kHz ma μa Ω 2
3 TF -0.5%ELECTRICAL CHARACTERISTIC (T A=25, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. Reference Input Voltage 1 V KA =, I K =10mA 2.482V 2.495V 2.507V Deviation of Reference V KA =, I K =10mA Input Voltage Over Δ /ΔT 1 T A =Full Range 3 17 Full Temperature Range Ratio of Change in ΔV KA =10V Reference Input Voltage Δ /ΔV KA 2 I K =10mA to the Change in Cathod ΔV KA =36V-10V -1-2 Voltage Reference Input Current I REF 2 I KA =10mA, =10kΩ, = Deviation of Reference I K =10mA, =10kΩ, = Input Current Over Full ΔI REF /ΔT 2 T A =Full Range Temperature Range Minimum Cathode ΔV KA =V I REF KA MIN 1 Current for Regulation Off-State Cathode V KA =36V, =0 I KA OFF 3 Current Dynamic Impedance V KA =, I K =1mA ~100mA, Z KA 1 f 1kHz UNIT mvmv /V μaμamaμa Ω -1%ELECTRICAL CHARACTERISTIC (T A=25, unless otherwise specified) CHARACTERISTIC SYMBOL CIR-CUIT TEST CONDITION MIN. TYP. MAX. Reference Input Voltage 1 V KA =, I K =10mA 2.470V 2.495V 2.520V Deviation of Reference V KA =, I K =10mA Input Voltage Over Δ /ΔT 1 T A =Full Range 3 17 Full Temperature Range Ratio of Change in ΔV KA =10V Reference Input Voltage Δ /ΔV KA 2 I K =10mA to the Change in Cathod I ΔV KA =36V-10V -1-2 Voltage Reference Input Current I REF 2 I KA =10mA, =10kΩ, = Deviation of Reference I K =10mA, =10kΩ, = Input Current Over Full ΔI REF /ΔT 2 T A =Full Range Temperature Range Minimum Cathode ΔV KA =V I REF KA MIN 1 Current for Regulation Off-State Cathode V KA =36V, =0 I KA OFF 3 Current Dynamic Impedance V KA =, I K =1mA ~100mA, Z KA 1 f 1kHz UNIT mvmv /V μaμamaμa Ω 3
4 TF Fig. 1 Test Circuit for V KA = Fig. 2 Test Circuit for V KA INPUT I KA V KA INPUT I KA V KA DUT I REF DUT V KA = (1+/)+I REF Fig. 3 Test Circuit for I KA (off) INPUT I KA V KA DUT 4
5 TF TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE VOLTAGE vs FREE-AIR TEMPERATURE REFERENCE CURRENT vs FREE-AIR TEMPERATURE =2500 mv 5 4 =10 kω = I KA =10 ma VREF-REFERENCE VOLTAGE =25 mv =2440 mv VREF-REFERENCE VOLTAGE 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 at I KA =10 mv, T A =25 Figure 4. Figure 5. CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE V KA = T A =25 V KA =V ERF T A = IKA-CATHODE CURRENT IKA-CATHODE CURRENT I MIN V KA -CATHODE VOLTAGE-V V KA -CATHODE VOLTAGE-V Figure 6. Figure 7. 5
6 TF TYPICAL PERFORMANCE CHARACTERISTICS 2.5 V KA =36 V OFF-STATE CATHODE CURRENT vs FREE-AIR TEMPERATURE V KA =3V TO 36V RATIO DELTA REFERENCE VOLTAGE TO DELTA CATHODE VOLTAGE vs FREE-AIR TEMPERATURE IOFF-OFFSTATE CATHODE CURRENT 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 =10 ma T A =25 VIN-EQUIVALENT NOISE VOLTAGE- nv K 10K 100K f-frequency- Hz Figure 10. 6
7 TYPICAL PERFORMANCE CHARACTERISTICS TF 19.1V 1 kω 500 μf 910Ω (DUT) 820Ω 16Ω 0.1 μf 2000 μf 160 kω Ω V CC V EE TL2027 A V =10V/ mv 16 kω 16 kω 1 μf 1 μf V CC + - TL μF 33kΩ 33kΩ A V =2V/V V EE TO OSCILLOSCOPE Figure 11. Test Circuit for Equivalent Input Noise Voltage SMALL-SIGNAL VOLTAGE AMPLIFICATION VS FREQUENCY 60 AV-SMALL-SIGNAL VOLTAGE AMPLIFICATIO I KA =10 ma T A =25 ~ 9 μf 15 kω 8.25 kω I KA + - OUTPUT 232Ω GND 10 Test Circuit for Voltage Amplification 0 1K 10K 100K 1M 10M f-frequency- Hz Figure 12. Oct Rev 03 7
8 TF TYPICAL PERFORMANCE CHARACTERISTICS REFERENCE IMPEDANCE VS FREQUENCY ZKA -REFERENCE IMPEDANCE I KA =10 ma T A =25 ~ 1 kω 50Ω - + I KA OUTPUT GND Test Circuit for Reference Impedance 0.1 1K 10K 100K 1M 10M f-frequency- Hz Figure 13. REFERENCE IMPEDANCE VS FREQUENCY 6 T A =25 INPUT 5 220Ω OUTPUT ZKA -REFERENCE IMPEDANCE OUTPUT PULSE GENERATOR f=100 khz 50Ω GND Test Circuit for Pulse Response t-time- μs Figure 14. 8
9 APPLICATION INFORMATION TF R (SEE NOTE A) =(1+ ) RETURN NOTE A : R Should provide cathode current 1 ma to the at minimum Figure 15. Shunt Regulator INPUT V IT ~ 2.5V N ~ 2.5V FF ~ GND Figure 16. Single-Supply Comparator With Temperature-Compensated Threshold R (SEE NOTE A) 30Ω 0.01 μf 2N kω 2N222 =(1+ ) NOTE A : R Should provide cathode current 1 ma to the at minimum Figure 17. Precision High-Current Series Regulator 9
10 TF APPLICATION INFORMATION IN LM7805 OUT COMMON =(1+ ) MINIMUM = +5V Figure 18. Output Control of a 3-Terminal Fixed Regulator = (1+ ) RETURN Figure 19. High-Current Shunt Regulator C (SEE NOTE A) NOTE A : Refer to the stability boundary conditions in Figure 16 to determine allowable values for C. Figure 20. Crowbar Circuit 10
11 APPLICATION INFORMATION TF IN 8.2 kω LM317 Adjust OUT 243Ω ~ 5V, 1.5A 243Ω Figure 21. Precision 5-V 1.5A Regulator R B (SEE NOTE A) 27.4 MΩ ~ 5V 27.4 MΩ NOTE A : R B Should provide cathode current 1 ma to the. Figure 22. Efficient 5-V Precision Regulator 12V 6.8 MΩ 5V 10 MΩ - 10 MΩ 10 MΩ X NOT USED + TL598 FEED BACK Figure 23. PWM Converter With Reference 11
12 TF APPLICATION INFORMATION A R3 (SEE NOTE A) B OUT R4 (SEE NOTE A) LOW LIMIT= B (1+ ) B HIGH LIMIT= (1+ A ) A A B LED ON WHEN LOW LIMIT<<V I(BATT) <HIGH LIMIT NOTE A : R3 and R4 are selected to provide the desired LED intensity and cathode current 1 ma to the at the available V I(BATT). Figure 24. Voltage Monitor 12V R 650Ω 2 kω OFF ON C DELAY=RxCxI N 12V ( ) 12V- Figure 25. Delay Timer I O R CL I OUT = R CL + I KA = V I(BATT) I O H FE + I KA Figure 26. Precision Current Limiter 12
13 TF APPLICATION INFORMATION I O I O = R S R S Figure 27. Precision Constant-Current Sink 13
14 Symbol Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A A b c D D E e TYP TYP. e L Φ h
15
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