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| TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET DESCRIPTION KEY FEATURES INITIAL VOLTAGE REFERENCE ACCURACY OF 0.4% (TL431B) SINK CURRENT CAPABILITY 1mA to 100mA TYPICAL OUTPUT DYNAMIC IMPEDANCE LESS THAN 200m; TYPICAL OUTPUT IMPEDANCE OF THE TL431B LESS THAN 100m ADJUSTABLE OUTPUT VOLTAGE FROM 2.5V TO 36V AVAILABLE IN SURFACE-MOUNT PACKAGES LOW OUTPUT NOISE TYPICAL EQUIVALENT FULL RANGE TEMPERATURE COEFFICIENT OF 30ppm/C DIRECT PIN-TO-PIN REPLACEMENT FOR INDUSTRY STANDARD TL431 AND TL1431 WWW .Microsemi .C OM IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com PRODUCT HIGHLIGHT Precision Programmable References TL431/A & TL431B OB R EC S OM OL ME ET ND E ED VIN FO O R DU NE C WT DE VOUT R1 R2 VO = 1+ The TL431/TL431A/TL431B series precision adjustable three terminal shunt voltage regulators are pin-to-pin compatible with the industry standard TL431. The output voltage of this reference is programmable by using two external resistors from 2.5V to 36V. These devices offer low output impedance for improved load PR PACKAGE ORDER INFO NO TA (C) Initial Tolerance 2% 1% 0.4% 2% 1% 0.4% DM Plastic SOIC 8-Pin LP Plastic TO-92 3-Pin TL431CLP TL431ACLP TL431BCLP TL431ILP TL431AILP TL431BILP T RoHS Compliant / Pb-free Transition DC: 0440 RoHS Compliant / Pb-free Transition DC: 0509 SI GN S R1 R2 regulation. The typical output impedance of these devices is 200m. These devices find application in the feedback path of switching power supplies, OVP crowbar circuits, reference for A/D, D/A, and as zener diodes with improved turn-on characteristics. *VREF PK Plastic TO-89 3 - Pin RoHS Compliant / Pb-free Transition DC: 0518 TL431X TL431X 0 to 70 -40 to 85 TL431CDM TL431ACDM TL431BCDM TL431IDM TL431AIDM TL431BIDM TL431CPK TL431ACPK TL431BCPK TL431IPK TL431AIPK TL461BIPK Note: All surface mount packages are available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LTL431AIDM-TR). The TO-92 (LP) package is available in ammo-pack. Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT FO O R DU NE C WT DE Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. Note 2. Voltage values are with respect to the anode terminal unless otherwise noted. Cathode SI GN S Cathode to Anode Voltage (VKA)(Note 2) ....................................................... -0.3 to 37V Reference Input Current (IREF).................................................................. -50A to 10mA Continuous Cathode Current (IK) .......................................................... -100mA to 150mA Operating Junction Temperature................................................................................ 150C Storage Temperature Range.........................................................................-65C to 150C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260C (+0 -5) WWW .Microsemi .C OM 3. Cathode 2. Anode 1. Ref LP PACKAGE (Top View) 1 8 Ref Anode Anode N.C. N.C. 2 7 THERMAL DATA Anode N.C. 3 6 4 5 DM PK LP Plastic SOIC 8-Pin DM PACKAGE (Top View) THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 165C/W 3 Cathode Anode Ref Plastic TO-89 3-Pin PR 2 THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 71C/W 1 Plastic TO-92 3-Pin PK PACKAGE (Top View) THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA EC S OM OL ME ET ND E ED 156C/W RoHS / Pb-free 100% Matte Tin Lead Finish Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. BLOCK DIAGRAM Cathode (K) Ref (R) T OB R P D PACKAGE DATA NO VREF Copyright (c) 1999 Rev. 1.4, 2006-09-26 Anode (A) Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperature for the TL431C/TL431AC/TL431BC with 0C < TA < 70C, and TL431I/TL431AI/TL431BI with -40C < TA < 85C WWW .Microsemi .C OM VREF VKA FO O R DU NE C WT DE EC S OM OL ME ET ND E ED TL431 TL431A TL431B TL431C TL431I TL431AC Reference Drift TL431AI TL431BC TL431BI TL431, Voltage Ratio, Ref to TL431A Cathode (Note 4) TL431B TL431, Reference Input TL431A Current TL431B Minimum Operating Current TL431 TL431A Off-State Cathode Current TL431B Reference Input Voltage VREF IK = 10mA, VKA = VREF, TA = 25C IK = 10mA, VKA = VREF, TA = 25C IK = 10mA, VKA = VREF, TA = 25C IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF IK = 10mA, VKA = VREF SI GN S Min 2440 2470 2490 Parameter Symbol Test Conditions TL431/A/B Typ Max 2495 2495 2500 4 5 4 5 4 5 2550 2520 2510 17 30 17 30 15 20 Units mV mV IK = 10mA, VKA = 2.5V to 36V IK = 10mA, VKA = 2.5V to 36V -1.4 -1.1 2 1.5 0.4 0.1 0.1 0.18 0.2 0.1 -2.7 -2.0 4 1.9 1 1 1 2 0.5 0.5 mV/V IMIN IOFF TL431 Dynamic Impedance TL431B I ZKA I VKA = VREF, TA = 25C VKA = VREF to 36V VKA = VREF to 36V, TA= 25C VKA = VREF to 36V, TA= 25C VKA = VREF to 36V, TA= Operating Range VKA = 36V, VREF = 0V, TA= 25C VKA = VREF, IK = 1mA to 100mA, f < 1kHz, TA = 25C VKA = VREF, IK = 1mA to 100mA, f < 1kHz, TA = 25C PR IREF VKA = VREF, TA = 25C A mA A 0.2 Note 3: These parameters are guaranteed by design. Note 4: VREF VKA Ratio of change in reference input voltage to the change in cathode voltage. NO T OB R ELECTRICALS ELECTRICALS Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET GRAPH / CURVE INDEX Characteristic Curves Figure # 1. Reference Input Voltage vs. Free-Air Temperature 2. Reference INput Current vs. Free-Air Temperature 3. Cathode Current vs. Cathode Voltage 4. Cathode Current vs. Cathode Voltage 5. Off-State Cathode Current vs. Free-Air Temperature 6. Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Free-Air Temperature 7. Equivalent Input Noise Voltage vs. Frequency FIGURE INDEX Parameter Measurement Information Figure # 8. Test Circuit For VKA = VREF 9. Test Circuit For VKA > VREF 10. Test Circuit for IOFF Typical Characteristics Figure # 11. Equivalent Input Noise Voltage Over a 10-Second Period 12. Small-Signal Voltage Amplification vs. Frequency 13. Reference Impedance vs. Frequency 14. Pulse Response 15. Stability Boundary Conditions Application Information Figure # 16. Shunt Regulator 17. Single-Supply Comparator with TemperatureCompensated Threshold 18. High Current Shunt Regulator 19. Crowbar Circuit 20. Voltage Monitor 21. Precision Constant-Current Sink WWW .Microsemi .C OM NO T OB R EC S OM OL ME ET ND E ED FO O R DU NE C WT DE PR SI GN S CHARTS CHARTS Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET CHARACTERISTIC CURVES 2.60 2.58 5 WWW .Microsemi .C OM (VREF) Reference Input Voltage - (V) 2.54 2.52 TL431/A 2.50 2.48 2.46 2.44 2.42 2.4 -50 TL431/A VREF= 2495mV TL431/A VREF= 2440mV -25 0 25 50 75 100 125 FO O R DU NE C WT DE 2 TL431B 3 TL431/A TL431B 1 PR 0 -50 -25 0 SI GN S 25 50 75 100 2.56 VREF= 2550mV (IREF) Reference Input Current - (A) VREF= V KA IK = 10mA 4 IK = 10mA R1 = IK = 10mA 125 (TA ) Ambient Temperature - (C) Figure 1 - Reference Voltage vs. Free-Air Temperature (TA ) Ambient Temperature - (C) 150 125 EC S OM OL ME ET ND E ED (IK) Cathode Current - (A) Figure 2 - Reference Current vs. Free-Air Temperature 800 VKA = V REF TA = 25 C VKA = V REF TA = 25 C 600 (IK) Cathode Current - (A) 100 75 50 25 0 -25 -50 -75 -100 -2 -1 400 IMIN OB R TL431/A 200 TL431B 0 NO T 0 1 23 -200 -1 0 1 23 CHARTS CHARTS (VKA ) Cathode Voltage - (V) Figure 3 - Cathode Current vs. Cathode Voltage (VKA ) Cathode Voltage - (V) Figure 4 - Cathode Current vs. Cathode Voltage Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET CHARACTERISTIC CURVES 2.5 -0.85 WWW .Microsemi .C OM (IOFF) Off-State Cathode Current - (A) VKA = 36V VREF= 0 2 TL431/A & TL431B VKA = 3V to 36V -0.95 -1.05 1.5 1 0.5 FO O R DU NE C WT DE -1.15 -1.25 -1.35 -1.45 -25 0 PR VREF / 0 -50 SI GN S 25 50 75 100 VKA - (mV/V) -50 125 -25 0 25 50 75 100 125 260 240 (VN) Noise Voltage - (nV/ Hz) 220 200 180 160 140 120 100 10 100 NO 1k T 10k OB R EC S OM OL ME ET ND E ED IO = 10mA TA = 25 C 100k (TA ) Ambient Temperature - (C) Figure 6 - Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Free-Air Temperature Figure 5 - Off-State Cathode Current vs Free-Air Temperature (TA ) Ambient Temperature - (C) CHARTS CHARTS (f) Frequency - (Hz) Figure 7 - Equivalent Input Noise Voltage vs. Frequency Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET PARAMETER MEASUREMENT INFORMATION Input IK VKA Input VKA R1 IREF WWW .Microsemi .C OM VREF Figure 8 - Test Circuit for VKA = VREF Input IOFF T OB R Figure 10 - Test Circuit for IOFF EC S OM OL ME ET ND E ED PR VKA FO O R DU NE C WT DE R2 VREF Figure 9 - Test Circuit for VKA > VREF SI GN S IK APPLICATIONS APPLICATIONS Copyright (c) 1999 Rev. 1.4, 2006-09-26 NO Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET TYPICAL CHARACTERISTICS WWW .Microsemi .C OM 6 5 (VN) Input Noise Voltage - (V) 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 2 4 Figure 11 - Equivalent Input Noise Voltage over a 10 - Second Period 19.1V 1k OB R 500F 910 2000 F EC S OM OL ME ET ND E ED (t) Time - (s) VCC TL431/A & TL431B (DUT) 820 16 TLE2027 A V = 10V/mV FO O R DU NE C WT DE 68 1F 16k PR SI GN S 10 VCC TLE2027 2.2F f = 0.1 to 10Hz IK = 10mA TA = 25 C T 16k APPLICATIONS APPLICATIONS NO 1F 160K 33k A V = 2V/V 33k VEE 1M CRO 0.1F VEE Test Circuit for 0.1Hz to 10Hz Equivalent Input Noise Voltage Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET TYPICAL CHARACTERISTICS 70 60 50 40 30 20 10 0 -10 1k 10k 100k 1M WWW .Microsemi .C OM (AY) Voltage Amplification - (dB) IK = 10mA TA = 25 C Output SI GN S IK 15k 9F 230 FO O R DU NE C WT DE 8.25k PR GND 10M Test Circuit for Voltage Amplification (f) Fre quency - (Hz) Figure 12 - Reference Impedance vs. Frequency 100 (IzKAI) Reference Impedance IK = 1mA to 100mA TA = 25 C EC S OM OL ME ET ND E ED Output 1k 10 IK 50 1 T OB R 0.1 1k 10k NO GND 1M 10M 100k CHARTS CHARTS Test Circuit for Reference Impedance (f) Frequency - (Hz) Figure 13 - Reference Impedance vs. Frequency Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET TYPICAL CHARACTERISTICS 6 5 WWW .Microsemi .C OM VIN - (V) 4 3 2 1 Pulse Generator f = 100kHz 50 220 (VKA) Output Voltage - (V) 0 3 2 1 0 05 13 2 4 FO O R DU NE C WT DE SI GN S IK 150 VBATT Ou tput GND PR 6 Test Circuit for Pulse Response (t) Time - (s) Figure 14 - Pulse Response 100 90 (IK) Cathode Current - mA 80 70 60 50 40 30 20 10 0 0.001 A V KA = V REF B V KA = 5V C V KA = 10V D V KA = 15V Stable A* EC S OM OL ME ET ND E ED IK = 10mA TA = 25 C Stable C* R1=10k B* CL R2 OB R D* Test Circuit for Curve A 150 IK 0.01 NO 0.1 T 1 10 CHARTS CHARTS CL VBATT (CL) Load Capacitance - (F) Figure 15 - Stability Boundary Conditions *The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VKA and IK conditions with CL = 0. VBATT and CL were then adjusted to determine the ranges of stability. Test Circuit for Curve B, C, D Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10 TL431 / TL431A / TL431B TM (R) Precision programmable References PRODUCTION DATA SHEET APPLICATION INFORMATION R (see Note) VBATT R1 0.1% IK VO VBATT WWW .Microsemi .C OM VREF TL431/A & TL431 B R2 0.1% Input * VREF R2 Figure 16 - Shunt Regulator Note: R should provide > 1mA cathode current to the TL431/A & TL1431 at minimum VBATT VBATT R1 VO VO = 1 + R1 FO O R DU NE C WT DE VBATT Figure 17 - Single-Supply Comparator with TemperatureCompensated Threshold VO PR R1 TL431/A & TL431B R2 TL431/A & TL431B EC S OM OL ME ET ND E ED R2 * VREF R2 Figure 18 - High Current Shunt Regulator 12V R1A R3 (see Note) VO = 1 + R1 Figure 19 - Crowbar Circuit Note: Refer to the stability boundary conditions in Figure 15 to determine allowable values for C. TL431/A & TL431B OB R R4 (Note) VBATT IO R2A R2B T TL431/A & TL431B SI GN S TL431/A & TL431B VO VON 2V VOFF VBAT T GND C (see Note) APPLICATIONS APPLICATIONS NO R1B Low Limit = 1 + * VREF R2B * VREF R2B LED on when Low Limit < VBATT < High Limit Figure 20 - Voltage Monitor Note: R3 and R4 are selected to provide the desired LED intensity and > 1mA cathode current to the TL431/A & TL431B at the available V+ RS 0.1% High Limit = 1 + R1B Figure 21 - Precision Contact - Current Sink Copyright (c) 1999 Rev. 1.4, 2006-09-26 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 11 |
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