PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ FEATURES TO-92 PKG z Programmable Output Voltage to 40V z Guaranteed 0.5% Reference Voltage Tolerance z Low (0.2Ω Typ.) Dynamic Output Impedance 3 T O P z Cathode Current Range(Continuous) – 100 ~ 150 mA z Equivalent Full Range Temperature Coefficient of 2 1 50PPM/℃ z Temperature Compensated For Operation Over Full Rate Operating Temperature Range z Low Output Noise Voltage z Fast Turn-on Response z TO-92, SOT-89 or SOT-23 3L Package SOT-23 PKG 2 TOP APPLICATION z z z z z z z 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 1 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 PIN 1. Reference 2 2. Anode 3 3. Cathode ORDERING INFORMATION Device (Marking) Package TL431Z TO-92 TL431-AZ TL431-CZ from -40℃ to +125℃. 431Z SOT-23 3L 431Z SOT-89 3L Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) CHARACTERISTIC SYMBOL MIN. MAX. UNIT VKA - 42 V IK -100 150 mA IREF 0.05 10 mA Junction Temperature Range TJ 0 150 ℃ Storage Temperature Range TSTG -60 150 ℃ Operating Temperature Range TOPR -40 125 ℃ Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range 2009 – Obsolete -1- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL MIN. MAX. UNIT Cathode Voltage VKA VREF 40 V Cathode Current IK 0.5 100 mA Ordering Information VREF Package Tolerance 0.5% TO-92 1% 2% 2.495V SOT-23 SOT-89 Order No. Package Marking TL431CZ TL431-CZ TL431CZTA TL431AZ TL431-AZ TL431AZTA TL431Z TL431Z TL431ZTA Status Obsolete Obsolete Obsolete Obsolete Obsolete Obsolete 0.5% TL431CZSF Obsolete 1% TL431AZSF 2% TL431ZSF Obsolete 0.5% TL431CZF Obsolete 1% TL431AZF 2% TL431ZF 431Z 431Z Obsolete Obsolete Obsolete TL 431 CZ SF Package Type Tolerance Blank TA SF F : Bulk : TO-92 : SOT-23 : SOT-89 CZ : 0.5% AZ : 1% Z : 2% Root Name Product Code 2009 – Obsolete -2- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ PIN CONFIGURATION 2 Marking Side TOP TOP 1 3 1 2 3 1 2 3 TO-92 PKG SOT-23 PKG SOT-89 PKG PIN DESCRIPTION Pin No. TO-92 / SOT-23 / SOT-89 Name Function 1 Reference Reference Voltage 2 Anode Ground 3 Cathode Input Supply Voltage TL431Z ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) CHARACTERISTIC Reference Input Voltage 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 SYMBOL VREF ΔVREF/ΔT ΔVREF/ΔVKA TEST CONDITION MIN. TYP. MAX. TL431CZ 2.483 2.495 2.507 TL431AZ 2.47 2.495 2.52 TL431Z 2.44 2.495 2.55 3 17 ΔVKA=10V -VREF -1.4 -2.7 ΔVKA=36V-10V -1.0 -2.0 VKA =VREF, IK =10mA VKA = VREF, IK =10mA TA =Full Range IK =10mA UNIT V mV mV/V IREF IKA=10mA, R1=10㏀, R2=∞ 1.8 4.0 uA ΔIREF/ΔT IK =10mA, R1=10㏀, R2=∞ TA =Full Range 0.4 1.2 uA 0.5 mA Minimum Cathode Current for Regulation IK(MIN) VKA= VREF Off-State Cathode Current IKOFF VKA=42V, VREF=0 0.17 0.9 uA VKA= VREF, IK =1mA~100mA f ≤ 1kHz 0.27 0.5 Ω Dynamic Impedance 2009 – Obsolete ZKA -3- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ TEST CIRCUITS [ 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 TL431Z/AZ/CZ TYPICAL OPERATING CHARACTERISTICS REFERENCE VOLTAGE vs JUNCTION TEMPERATUR PULSE RESPONS 2.501 Input & Output Voltage (V) VREF-Reference Voltage (V) 6 VKA=VREF IKA=10mA 2.500 2.499 2.498 VREF=2.495V ± 0.5% 2.497 2.496 2.495 2.494 4 3 Output 2 1 2.493 2.492 0 0 20 40 60 80 100 120 -1 0 1 2 TJ-Junction Temperature (℃) 3 4 5 6 7 8 t-Time (us) CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 0.15 800 VKA=VREF TA=25℃ 0.13 0.10 VKA=VREF TA=25℃ IKA-Cathode Current (uA) IKA-Cathode Current (mA) VKA=VREF IKA=10mA TA=25℃ Input 5 0.08 0.05 0.03 0.00 -0.03 -0.05 600 400 200 0 -0.08 -0.10 -2.0 -1.0 0.0 1.0 2.0 -200 3.0 -1.0 VKA-Cathode Voltage (V) 0.0 1.0 2.0 3.0 VKA-Cathode Voltage (V) T.B.D 2009 – Obsolete -6- HTC PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ/CZ APPICATION INFORMATION 1. Shunt Regulator 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 TL431Z/AZ/CZ 4. High-Current Shunt Regulator 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 TL431Z/AZ/CZ 7. PWM Converter With Reference 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 TL431Z/AZ/CZ 10. Precision Current Limiter TL431Z 11. Precision Constant-Current Sink TL431Z 2009 – Obsolete - 10 - HTC