TL431

SEMICONDUCTOR TECHNICAL DATA PROGRAMMABLE PRECISION REFERENCES TL431 Series BIPOLAR LINEAR INTEGRATED CIRCUIT The TL431 Series integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage reference operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic impedance of 0.22 .The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 volt reference makes it convenient to obtain a stable reference from 5.0 volt logic supplies, and since the TL431 Series operates as a shunt regulator, it can be used as either a positive or negative voltage reference. FEATURES Divice Code Name :TL431 + Vref Code + Package Code ITEM Code TL431 A B Vref Code Tolerance (%) 2.2 1.0 0.5 Code F Package Code Package TO-92 SOT-89 Low Dynamic Output Impedance : 0.22 (Typ.). Sink Current Capability of 1.0 to 100mA. Equivalent Full-Range Temperature Coefficient of 50ppm/ (Typ.). Temperature Compensated for Operation Over Full Rated Operating Temperature Range. Low Output Noise Voltage. LINE UP Type No. TL431 TL431A TL431B TL431F TL431AF TL431BF Operating Voltage(V) Package TO-92 2.5~36 SOT-89 3D 3E 3F Marking BLOCK DIAGRAM Cathode (K) Cathode (K) Reference (R) Reference (R) + - 2.5Vref Anode (A) Anode (A) 2008. 7. 3 Revision No : 0 1/6 TL431 Series MAXIMUM RATINGS (Ta=25 ) (Full operating ambient temperature range applies unless otherwise noted.) CHARACTERISTIC Cathode To Anode Voltage Cathode Current Range, Continuous Reference Input Current Range, Continuous Operating Junction Temperature Operating Temperature Storage Temperature TL431 Total Power Dissipation TL431F PD SYMBOL VKA IK Iref Tj Topr Tstg RATING 37 -100 150 UNIT V mA mA -0.05 10 150 -40 85 -65 150 700 mW 800 ELECTRICAL CHARACTERISTICS (Ta=25 CHARACTERISTICS TL431 Reference Input Voltage Reference Input Voltage Deviation Over Temperature Range Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage Ta=25 Ta=Topr TL431A TL431B Vref Vref ) TEST CIRCUIT TEST CONDITION MIN. 2.440 Figure 1 VKA=Vref , IK=10mA 2.470 2.4825 Figure 1 (Note 1) VKA=Vref , IK=10mA VKA= Figure 2 IK=10mA, R1=10k , R2= IK=10mA, R1=10k , R2= VKA=Vref VKA=36V, Vref=0V VKA=Vref, IK=1.0 100mA, f 1.0kHz TYP. 2.495 2.495 2.495 7.0 -1.4 -1.0 1.8 0.8 0.5 2.6 0.22 MAX. 2.550 2.520 2.5075 30 -2.7 mV/V -2.0 4.0 6.5 2.5 1.0 1000 A UNIT V V V mV SYMBOL Vref/ VKA Figure 2 IK=10mA 10V Vref VKA= 36V 10V Reference Input Current Reference Input Current Iref Deviation Over Temperature Range Minimum Cathode Current For Regulation Off-State Cathode Current Dynamic Impedance Iref Imin Ioff Zka Figure 2 Figure 1 Figure 3 Figure 1 (Note 2) A mA nA 2008. 7. 3 Revision No : 0 2/6 TL431 Series FIGURE 1-TEST CIRCUIT FOR VKA = Vref Input IK VKA FIGURE 3-TEST CIRCUIT FOR I off Input I off VKA Vref FIGURE 2-TEST CIRCUIT FOR VKA > Vref Input IK R1 Iref VKA = Vref ( 1+ R1 ) + Iref R2 Example : Vref = 8.0mV and slope is positive, Vref at 25 =2.495V, Ta=70 = 45.8 ppm/ VKA Vref = R1 0.008 70 106 (2.495) Note 2: The dynamic impedance Zka is defined as: |Zka| = VKA Ik R2 Vref When the device is programmed with two external Note 1: The deviation parameter Vref is defined as the differences between the maximum and minimum values obtained over the full operating ambient temperature range that applies. |Zka’| = |Zka| (1+ R1 R2 ) resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as: Vref Max. Vref = Vref (Max.) - Vref (Min.) Ta = T2 - T1 Vref Min. T1 T2 AMBIENT TEMPERATURE The average temperature coefficient of the Reference input voltage, Vref , is defined as: ( )= Vref Vref at 25 Ta Vref 106 ) 106 Vref ( ppm = Ta(Vref at 25 ) Vref can be positive or negative depending on whether Vref Min. or Vref Max. occurs at the lower ambient temperature. 2008. 7. 3 Revision No : 0 3/6 TL431 Series I K - VKA CATHODE CURRENT IK (mA) 150 CATHODE CURRENT I K (µA) VKA =V ref Ta=25 C I K - VKA 800 600 400 200 0 -200 -1.0 V KA =V ref Ta=25 C 100 50 0 -50 -100 -2.0 -1.0 0 1.0 2.0 3.0 0 1.0 2.0 3.0 CATHODE VOLTAGE VKA (V) DYNAMIC IMPEDANCE Zka (Ω) CATHODE VOLTAGE VKA (V) Zka Vref - VKA CHANGE IN REFERENCE INPUT VOLTAGE V (mV) ref 0 IK =10mA Ta=25 C -f 100 I K=1.0mA~100mA Ta=25 C 10 -8.0 -16 1.0 -24 0.1 1.0k 10k 100k 1.0M 10M -32 0 10 20 30 40 FREQUENCY f (Hz) CATHODE VOLTAGE VKA (V) 3.0 PULSE RESPONSE Ta=25 C OPEN LOOP VOLTAGE GAIN GVO (dB) VOLTAGE SWING (V) GVO - f 60 50 40 30 20 10 I K=10mA Ta=25 C 2.0 1.0 0 5.0 0 0 4.0 OUTPUT INPUT 8.0 12 16 20 0 -10 1.0k 10k 100k 1.0M 10M 1000 900 TIME t (µs) PD - Ta ALLOWABLE POWER DISSIPATION PD (mW) FREQUENCY f (Hz) 800 700 600 500 400 300 200 100 0 0 25 50 75 100 125 150 175 TL431 TL431F AMBIENT TEMPERATURE Ta ( C) 2008. 7. 3 Revision No : 0 4/6 TL431 Series B C A H C A G N K D E G H F F L 1 2 3 M DIM A B C D E F G H J K L M N MILLIMETERS 4.70 MAX 4.80 MAX 3.70 MAX 0.45 1.00 1.27 0.85 0.45 _ 14.00 + 0.50 0.55 MAX 2.30 0.45 MAX 1.00 J B E D K D F F 1 2 3 DIM A B C D E F G H J K MILLIMETERS 4.70 MAX _ 2.50 + 0.20 1.70 MAX 0.45+0.15/-0.10 4.25 MAX _ 1.50 + 0.10 0.40 TYP 1.75 MAX 0.75 MIN 0.5+0.10/-0.05 C J 1. REFERENCE 2. ANODE 1. REFERENCE 2. ANODE 3. CATHODE 3. CATHODE Heat Sink is common to 2 (ANODE) TO-92 SOT-89 2008. 7. 3 Revision No : 0 5/6 TL431 Series PRECAUTION FOR USE Lead-Free Soldering Condition. Elements mounting styles of electronic devices are gaining in further diversification over recent years, and needs for components are all the more expanding in varieties. Especially, surface mounting is steadily penetrating into industrial segments as a world-wide popular technical trend. Although exposure to high temperature is inevitable during soldering we recommend limiting the soldering temperature to low levels as shown in figure for the sake of retaining inherent excellent reliability. _ 10 + 1sec _ Peak : 260 + 3 C 250 C Temperature ( C) 230 C 180 C 150 C _ 90 + 30sec Preheating Zone _ 35 + 5sec Reflow Zone Time (sec) [Lead-Free Soldering Temperature Profile] 1. When employing solder reflow method 1) Soldering Condition Standard Condition : 250 Peak Condition : 260 3 2) Recommend temperature profile 3) Precautions on heating method When resin in kept exposed to high temperature for a long time, device reliability may be marred. Therefore, it is essential to complete soldering in the shortest time possible to prevent temperature of resin from rising. 2. When employing halogen lamps or infrared-ray heaters When halogen lamps or infrared-ray heaters are used, avoid direct irradiation onto resin surfaces; such devices cause extensive localized temperature rise. Please keep a reflow solder operating when Surface Mount Package s Soldering. (Temperature), 10 1sec. (Time) 2008. 7. 3 Revision No : 0 6/6