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| Precision Adjustable Shunt Reference CORPORATION TL431 FEATURES DESCRIPTION The TL431 is an adjustable shunt regulator designed to act as an open-loop error amplifier with a 2.5V temperature compensated reference. Its highly accurate 1% bandgap reference is perfect for applications requiring stability and accuracy over temperature and life. Sharp turn-on characteristics and a low temperature coefficient make the TL431 an excellent replacement for many zener diode applications, programmable to any value greater than 2.5V and up to 36V by using two external resistors. As a combination error amplifier and reference, it can be used to manage control loops such as switching power supplies. ORDERING INFORMATION Part TL431LP TL431D TL431S Package TO-92 8-Pin Plastc SOIC SOT-89 Temperature Range 0 to 105oC 0 to 105oC 0 to 105oC * * * * * * Trimmed 1% Bandgap Reference Nominal Temperature Range Extended to 105oC Temperature-Compensated: 30ppm/ oC Internal Amplifier with 150mA Capability Low Output Noise Low Frequency Dynamic Output Impedance PIN CONFIGURATION (Top View) TO-92 (LP) CATHODE 1 2 3 4 SOIC (D) 8 7 6 5 REFERENCE SOT-89 (S) CATHODE CATHODE ANODE ANODE ANODE N/C 1G-34 ANODE ANODE N/C ANODE REFERENCE 1G-33 REFERENCE 1G-35 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 TL431 CORPORATION ABSOLUTE MAXIMUM RATINGS SYMBOL VKA IAK IKA IREF PD PARAMETER Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power at 25 oC TO-92 8L SOIC SOT-89 Junction Temperature Storage Temperature Lead Temperature, Soldering 10 Seconds RATING 37 1 250 10 UNITS V A mA mA 775 750 1000 150 -65 to 150 300 mW mW mW o o o TJ TSTG TL C C C Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. RECOMMENDED CONDITIONS SYMBOL VKA IK PARAMETER Cathode Voltage Cathode Current RATING VREF to 20 10 UNIT V mA TYPICAL THERMAL RESISTANCE PACKAGE TO-92 SOIC SOT-89 JA 160 C/W 175 oC/W 110oC/W o JC 80 C/W 45 oC/W 8oC/W o TYPICAL DERATING 6.3mW/oC 5.7mW/oC 9.1mW/oC FUNCTIONAL BLOCK DIAGRAM CATHODE (K) REFERENCE (R) + - 2.5V ANODE (A) 1G-36 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 TL431 CORPORATION ELECTRICAL CHARACTERISTICS Electrical Characteristics are guaranteed over full junction temperature range (0 to 105oC). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: VKA = VREF and IK = 10mA unless otherwise stated. SYMBOL VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) ZKA PARAMETER Reference Voltage VREF with Temp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance -2.7 -2 MIN 2.470 2.449 0.07 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 0.3 4 1.2 1 250 0.5 A A mA nA 2 2 1 3 1 VREF = 0V, VKA = 36V f 1kHz, I K = 1 to 150mA Over Temp. TYP 2.495 MAX 2.520 2.541 0.20 UNIT V V mV/ C mV/V o TEST CIRCUIT 1 1 1 2 TEST CONDITION TA = 25oC Over Temp. VREF to 10V 10V to 36V *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) ppm mV 0 0 5000 0.5 TEST CIRCUITS V IN V KA = V REF I REF TEST CIRCUIT 1 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 % 0 -10 * TC in mV/oC = VREF T VREF (mV) TA * TC in %/oC = 0 15 30 45 60 75 90 105 VREF o VREF at 25 C TA x 100 TEMPERATURE (C) 0.07 mV/C 0.003 %/C 27 ppm/C 1G-37 * TC in ppm/ C = o VREF o VREF at 25 C TA x 106 V IN V KA V IN V KA IK IK R1 (V REF ) R2 I REF I K(OFF) 1G-38 1G-39 1G-40 TEST CIRCUIT 2 TEST CIRCUIT 3 TL431 CORPORATION TYPICAL PERFORMANCE CURVES 900 I K - CATHODE CURRENT (A) 800 700 600 500 400 300 200 100 0 -100 LOW CURRENT OPERATING CHARACTERISTICS VKA = VREF TEMPERATURE RANGE: -55 to 125C 150 I K - CATHODE CURRENT (mA) 125 100 75 50 25 0 -25 -50 -75 HIGH CURRENT OPERATING CHARACTERISTICS VKA = VREF TEMPERATURE RANGE: -55 to 125C 125C 25C -55C -200 -1.0 0 1.0 2.0 3.0 VKA - CATHODE VOLTAGE (V) 1G-41 -100 -2 -1 0 1 2 VKA - CATHODE VOLTAGE (V) 3 1G-42 100 I Z off - OFF STATE CATHODE CURRENT (nA) OFF STATE LEAKAGE VREF = 0V VREF - REFERENCE VOLTAGE (V) VKA = 36V 2.54 TEMPERATURE COEFFICIENT AS A FUNCTION OF TRIM VALUE VKA = VREF 2.53 I K = 10mA 2.52 2.51 10 1 2.50 2.49 2.48 2.47 2.46 -60 -30 0 30 60 90 120 TA - AMBIENT TEMPERATURE VREF = 2.503V AT 25C 0.1 0.01 0 30 60 90 120 -60 -30 TA - AMBIENT TEMPERATURE (C) 1G-43 1G-44 3.0 I REF - REFERENCE INPUT CURRENT (A) REFERENCE INPUT CURRENT VREF - CHANGE IN REFERENCE VOLTAGE (mV) R1 = 10k R2 = 2.5 I K = 10mA 2.0 1.5 1.0 0.5 0 0 30 60 90 120 -60 -30 TA - AMBIENT TEMPERATURE (C) 0 REFERENCE VOLTAGE LINE REGULATION -10 -55C 0C -20 25C 75C 125C -30 -40 I K = 10mA -50 TEMPERATURE RANGE: -55 to 125C 0 1G-45 3 6 9 12 15 18 21 24 27 30 VKA - CATHODE VOLTAGE (V) 1G-46 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 TL431 CORPORATION TYPICAL PERFORMANCE CURVES (continued) 70 NOISE VOLTAGE nV/ Hz 60 50 40 30 20 NOISE VOLTAGE Z KA - DYNAMIC IMPEDANCE () 0.150 0.125 0.100 0.075 0.050 0.025 LOW FREQUENCY DYNAMIC OUTPUT IMPEDANCE VKA = VREF I KA = 1 TO 100mA f 1kHz VKA = VREF 10 I K = 10mA TA = 25C 0 100 1k 10k 10 f - FREQUENCY (Hz) 100k 1G-47 0.0 -60 -30 0 30 60 90 120 TA - FREE AIR TEMPERATURE 1G-48 100 Z KA - DYNAMIC IMPEDANCE () DYNAMIC OUTPUT IMPEDANCE TA = 25C I K = 1 TO 100mA 10 1.0 0.1 0.01 1k 10k 100k 1M f - FREQUENCY (Hz) 10M 1G-49 70 A V - SMALL SIGNAL VOLTAGE GAIN (dB) 60 50 40 30 20 SMALL SIGNAL GAIN vs FREQUENCY OUT 15k 9F IK 230 TA = 25C I K = 10mA 8.25k GND 1H-01 10 0 1k 10k 100k 1M f - FREQUENCY (Hz) 10M 1G-50 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 TL431 CORPORATION TYPICAL PERFORMANCE CURVES (continued) INPUT AND OUTPUT VOLTAGES (V) 6 5 4 3 2 1 0 -1 PULSE RESPONSE INPUT INPUT MONITOR 220 OUT OUTPUT f P = 100kHz 50 GND 1H-03 0 1 2 3 4 5 6 7 8 9 10 11 12 t - TIME (s) 1H-02 100 I K - CATHODE CURRENT (mA) 90 80 70 60 50 40 30 20 10 STABILITY BOUNDARY CONDITIONS A: VKA = VREF B: VKA = 5V AT I K = 10mA C: VKA = 10V AT I K = 10mA D: VKA = 15V AT I K = 10mA 150 IK STABILITY REGION C 10k CL A B TA = 25C D 1H-05 0 100 101 102 103 104 105 106 107 C L - LOAD CAPACITANCE (pF) 1H-04 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 |
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