TL431-AZ

PROGRAMMABLE PRECISION SHUNT REGULATOR 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 TL431Z/AZ/CZ TO-92 PKG 3 T O P 2 1 SOT-23 PKG 2 TOP APPLICATION Shunt Regulator Precision High-Current Series Regulator High-Current Shunt Regulator Crowbar Circuit PWM Converter With Reference Voltage Monitor Precision Current Limiter 1 3 SOT-89 PKG TOP DESCRIPSION The TL431Z is a three-terminal adjustable shunt regulator with specified thermal stability over applicable temperature VREF (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 TL431Z is characterized for operation from -40℃ to +125℃. PIN 1. Reference ORDERING INFORMATION Device (Marking) TL431Z TL431-AZ TL431-CZ 431Z 431Z 1 2 3 2. Anode 3. Cathode Package TO-92 SOT-23 3L SOT-89 3L Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) CHARACTERISTIC Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range Junction Temperature Range Storage Temperature Range Operating Temperature Range 2009 – Obsolete SYMBOL VKA IK IREF TJ TSTG TOPR MIN. -100 0.05 0 -60 -40 MAX. 42 150 10 150 150 125 UNIT V mA mA ℃ ℃ ℃ -1- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC Cathode Voltage Cathode Current TL431Z/AZ/CZ MAX. 40 100 SYMBOL VKA IK MIN. VREF 0.5 UNIT V mA Ordering Information VREF Package Tolerance 0.5% Order No. TL431CZ TL431CZTA TL431AZ TL431AZTA TL431Z TL431ZTA TL431CZSF TL431AZSF TL431ZSF TL431CZF TL431AZF TL431ZF Package Marking TL431-CZ Status Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete TO-92 1% TL431-AZ 2% 2.495V SOT-23 0.5% 1% 2% 0.5% SOT-89 1% 2% TL431Z 431Z Obsolete Obsolete Obsolete 431Z Obsolete Obsolete TL 431 CZ SF Package Type Blank TA SF F CZ : 0.5% AZ : 1% Z : 2% : Bulk : TO-92 : SOT-23 : SOT-89 Tolerance Root Name Product Code 2009 – Obsolete -2- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR PIN CONFIGURATION Marking Side 2 TL431Z/AZ/CZ TOP TOP 1 123 3 1 2 3 TO-92 PKG SOT-23 PKG SOT-89 PKG PIN DESCRIPTION Pin No. 1 2 3 TO-92 / SOT-23 / SOT-89 Name Reference Anode Cathode Function Reference Voltage Ground Input Supply Voltage TL431Z ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) CHARACTERISTIC SYMBOL TEST CONDITION TL431CZ MIN. 2.483 2.47 2.44 TYP. 2.495 2.495 2.495 3 -1.4 -1.0 1.8 0.4 MAX. 2.507 2.52 2.55 17 -2.7 -2.0 4.0 1.2 UNIT Reference Input Voltage VREF VKA =VREF, IK =10mA TL431AZ TL431Z V Deviation of Reference Input Voltage Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance ΔVREF/ΔT VKA = VREF, IK =10mA TA =Full Range ΔVKA=10V -VREF mV ΔVREF/ΔVKA IREF ΔIREF/ΔT IK =10mA ΔVKA=36V-10V IKA=10mA, R1=10㏀, R2=∞ IK =10mA, R1=10㏀, R2=∞ TA =Full Range VKA= VREF VKA=42V, VREF=0 VKA= VREF, IK =1mA~100mA f ≤ 1kHz 0.17 0.27 mV/V uA uA IK(MIN) IKOFF ZKA 0.5 0.9 0.5 mA uA Ω 2009 – Obsolete -3- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TEST CIRCUITS TL431Z/AZ/CZ [ Fig 1. Test circuit for VKA = VREF ] [ Fig 2. Test circuit for VKA ≥ VREF ] [ Fig 3. Test circuit for IKA (OFF) ] 2009 – Obsolete -4- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ The deviation parameters ΔVREF/ΔT and ΔIREF/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, αVREF, is defined as : Where : ΔTA is the recommended operating free-air temperature range of the device. αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature. Example : Maximum VREF=2496mV at 30℃, maximum VREF=2492mV at 0℃, VREF=2495mV at 25℃, ΔTA=70℃ for TL431CZ. aVREF ⎛ 4mV ⎞ 6 ⎜ ⎟ × 10 23 ppm 2495mV ⎠ =⎝ ≈ 70°C °C Because minimum VREF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance The dynamic impedance is defined as : Z KA = ΔVKA ΔI KA When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by : Z' = R1 ⎞ ΔV ⎛ ≈ Z KA ⎜1 + ⎟ R2 ⎠ ΔI ⎝ 2009 – Obsolete -5- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TYPICAL OPERATING CHARACTERISTICS REFERENCE VOLTAGE vs JUNCTION TEMPERATUR TL431Z/AZ/CZ PULSE RESPONS 2.501 2.500 VREF-Reference Voltage (V) Input & Output Voltage (V) VKA=VREF IKA=10mA 6 5 4 3 2 1 0 Output Input 2.499 2.498 2.497 2.496 2.495 2.494 2.493 2.492 0 20 40 60 80 100 120 VKA=VREF IKA=10mA TA=25℃ VREF=2.495V ± 0.5% -1 0 1 2 3 4 5 6 7 8 TJ-Junction Temperature (℃) t-Time (us) CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 0.15 0.13 IKA-Cathode Current (mA) VKA=VREF TA=25℃ IKA-Cathode Current (uA) 800 VKA=VREF TA=25℃ 0.10 0.08 0.05 0.03 0.00 -0.03 -0.05 -0.08 -0.10 600 400 200 0 -2.0 -1.0 0.0 1.0 2.0 3.0 -200 -1.0 0.0 1.0 2.0 3.0 VKA-Cathode Voltage (V) VKA-Cathode Voltage (V) T.B.D 2009 – Obsolete -6- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR APPICATION INFORMATION 1. Shunt Regulator TL431Z/AZ/CZ TL431Z Note A : R Should provide cathode current 1mA to the TL431Z at minimum VI(BATT) 2. Precision High-Current Series Regulator TL431Z Note A : R Should provide cathode current≥1mA to the TL431Z at minimum VI(BATT) 3. Output Control of a Three-Terminal Fixed Regulator TL431Z 2009 – Obsolete -7- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR 4. High-Current Shunt Regulator TL431Z/AZ/CZ TL431Z 5. Precision 5-V 1.5A Regulator TL431Z 6. Efficient 5-V Precision Regulator TL431Z NOTE A : RB Should provide cathode current≥1mA to the TL431Z. 2009 – Obsolete -8- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR 7. PWM Converter With Reference TL431Z/AZ/CZ TL431Z 8. Voltage Monitor TL431Z NOTE A : R3 and R4 are selected to provide the desired LED intensity and cathode current ≥1mA to the TL431Z at the available VI(BATT). 9. Delay Timer TL431Z 2009 – Obsolete -9- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR 10. Precision Current Limiter TL431Z/AZ/CZ TL431Z 11. Precision Constant-Current Sink TL431Z 2009 – Obsolete - 10 - HTC