PROGRAMMABLE PRECISION SHUNT REGULATOR
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1 /AZ/CZ FEATURES Programmable Output Voltage to 40V Guaranteed 0.5% Reference Voltage Tolerance Low (0.2Ω Typ.) Dynamic Output Impedance Cathode Current Range(Continuous) 100 ~ 150 ma Equivalent Full Range Temperature Coefficient of 50PPM/ Temperature Compensated For Operation Over Full Rate Operating Temperature Range Low Output Noise Voltage Fast Turn-on Response TO-92, SOT-89 or SOT-23 3L Package APPLICATION Shunt Regulator Precision High-Current Series Regulator High-Current Shunt Regulator Crowbar Circuit PWM Converter With Reference Voltage Monitor Precision Current Limiter TO-92 PKG SOT-23 PKG SOT-89 PKG T O P 2 TOP TOP DESCRIPSION The is a three-terminal adjustable shunt regulator with specified thermal stability over applicable temperature V REF (Approx. 2.5V) and 40V with two external resistors. This device has a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making this device excellent replacement for zener diodes in many applications. The is characterized for operation from -40 to PIN 1. Reference 2. Anode 3. Cathode ORDERING INFORMATION Device (Marking) Package TL431-AZ TO-92 TL431-CZ 431Z SOT-23 3L 431Z SOT-89 3L Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) CHARACTERISTIC SYMBOL MIN. MAX. UNIT Cathode Voltage V KA - 42 V Cathode Current Range(Continuous) I K ma Reference Input Current Range I REF ma Junction Temperature Range T J Storage Temperature Range T STG Operating Temperature Range T OPR HTC
2 /AZ/CZ RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL MIN. MAX. UNIT Cathode Voltage V KA V REF 40 V Cathode Current I K ma Ordering Information V REF Package Tolerance Order No. Package Marking Status 0.5% TL431CZ TL431CZTA TL431-CZ TO-92 1% TL431AZ TL431AZTA TL431-AZ 2.495V 2% TA 0.5% TL431CZSF SOT-23 1% TL431AZSF 431Z 2% SF 0.5% TL431CZF SOT-89 1% TL431AZF 431Z 2% F TL 431 CZ SF Package Type Blank TA SF F : Bulk : TO-92 : SOT-23 : SOT-89 Tolerance CZ : 0.5% AZ : 1% Z : 2% Root Name Product Code HTC
3 /AZ/CZ PIN CONFIGURATION Marking Side 2 TOP TOP TO-92 PKG SOT-23 PKG SOT-89 PKG PIN DESCRIPTION Pin No. Name TO-92 / SOT-23 / SOT-89 Function 1 Reference Reference Voltage 2 Anode Ground 3 Cathode Input Supply Voltage ELECTRICAL CHARACTERISTICS (T A =25, unless otherwise specified) CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT TL431CZ Reference Input Voltage V REF V KA =V REF, I K =10mA TL431AZ V Deviation of Reference Input Voltage ΔV REF /ΔT V KA = V REF, I K =10mA T A =Full Range 3 17 mv Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage ΔV REF /ΔV KA I K =10mA ΔV KA =10V -V REF ΔV KA =36V-10V mv/v Reference Input Current I REF I KA =10mA, R 1 =10 kω, R 2 = ua Deviation of Reference Input Current ΔI REF /ΔT I K =10mA, R 1 =10 kω, R 2 = T A =Full Range ua Minimum Cathode Current for Regulation I K(MIN) V KA = V REF 0.5 ma Off-State Cathode Current I K OFF V KA =42V, V REF = ua Dynamic Impedance Z KA V KA = V REF, I K =1mA~100mA f 1kHz Ω HTC
4 /AZ/CZ TEST CIRCUITS [ Fig 1. Test circuit for V KA = V REF ] [ Fig 2. Test circuit for V KA V REF ] [ Fig 3. Test circuit for I KA (OFF) ] HTC
5 /AZ/CZ The deviation parameters ΔV REF /ΔT and ΔI REF /ΔT are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, αv REF, is defined as : Where : ΔT A is the recommended operating free-air temperature range of the device. αv REF can be positive or negative, depending on whether minimum V REF or maximum V REF, respectively, occurs at the lower temperature. Example : Maximum V REF =2496mV at 30, maximum V REF =2492mV at 0, V REF =2495mV at 25, ΔT A =70 for TL431CZ. av REF 4 6 mv mV = 70 C 23ppm C Because minimum V REF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : Z KA ΔV = ΔI KA KA When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by : ΔV R1 Z' = Z 1 + KA ΔI R HTC
6 /AZ/CZ TYPICAL OPERATING CHARACTERISTICS REFERENCE VOLTAGE vs JUNCTION TEMPERATUR PULSE RESPONS VREF-Reference Voltage (V) V KA =V REF I KA =10mA V REF =2.495V ± 0.5% Input & Output Voltage (V) Input Output V KA =V REF I KA =10mA T A = T J -Junction Temperature ( ) t-time (us) CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE IKA-Cathode Current (ma) V KA =V REF T A =25 IKA-Cathode Current (ua) V KA =V REF T A = V KA -Cathode Voltage (V) V KA -Cathode Voltage (V) T.B.D HTC
7 /AZ/CZ APPICATION INFORMATION 1. Shunt Regulator Note A : R Should provide cathode current 1mA to the at minimum V I(BATT) 2. Precision High-Current Series Regulator Note A : R Should provide cathode current 1mA to the at minimum V I(BATT) 3. Output Control of a Three-Terminal Fixed Regulator HTC
8 /AZ/CZ 4. High-Current Shunt Regulator 5. Precision 5-V 1.5A Regulator 6. Efficient 5-V Precision Regulator NOTE A : R B Should provide cathode current 1mA to the HTC
9 /AZ/CZ 7. PWM Converter With Reference 8. Voltage Monitor NOTE A : R3 and R4 are selected to provide the desired LED intensity and cathode current 1mA to the at the available V I(BATT). 9. Delay Timer HTC
10 /AZ/CZ 10. Precision Current Limiter 11. Precision Constant-Current Sink HTC
Shenzhen Tuofeng Semiconductor Technology Co., Ltd
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