TL431G

UMW R UMW TL431 Adjustable Precision Shunt Regulator ‹ ‹ Description The TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vref and 36 volts with two external resistors. These device have a typical dynamic output impedance of 0.27Ω, Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. ‹ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ‹ Symbol ¾ ¾ ¾ ¾ ¾ ¾ ‹ Features Programmable Output Voltage to 36V. Low Dynamic Output Impedance : TL431xx: 0.27 Ω (Typical). Sink Current Capability of 0.1mA to 100mA. Equivalent Full-Range Temperature Coefficient of 50 ppm/oC Temperature Compensated for Operation over Full Rated Operating Temperature Range. Low Output Noise Voltage. Fast Turn on Responds. SOT-23, TO-92, SOT-89, SOP-8 packages Applications Precision Voltage Reference Linear Regulator Adjustable Power Supply Switching Power Supply Graphic Card Adapter Pin Description www.umw-ic.com 1 友台半导体有限公司 UMW ‹ R UMW TL431 Absolute Maximum Ratings Symbol VKA Parameter Cathode Voltage IK Cathode Current Range(Continuous) IREF Reference Input Current Range Toper. Operating Temperature Range TJ TL431xx Junction Temperature Range Tstg ‹ TL431xx Storage Temperature Range Value Unit 40 V -100~150 mA 0.05~10 mA -20~85 o 150 o -65~+150 o C C Thermal Characteristics Symbol Parameter Package Typical Value SOT-23 416 θJA Thermal Resistance From Junction to Ambient in Free Air. (Measured with the component mounted on a high effective thermal conductivity test board in free air.) TO-92 250 SOT-89 250 SOP-8 210 ‹ C Unit o C/W Recommended Operating Conditions Symbol Characteristic Min. Typ. Max. Unit VKA Cathode Voltage TL431xx VREF - 36 V IK Cathode Current TL431xx 0.5 - 100 mA www.umw-ic.com 2 友台半导体有限公司 UMW ‹ R UMW TL431 Electrical Characteristics (Ta=25 °C, VKA=VREF, IK=10mA unless otherwise noted .) Symbol Parameter Test Condition Min. VREF VREF(dev) Reference input Voltage VKA=VREF, IK=10mA Deviation of Reference Input Voltage Over Full Temperature Range Tmin≦Ta≦Tmax Typ. Max. 0.5% 2.483 2.495 2.508 1% 2.470 2.495 2.520 - 3 17 △VKA=10V-VREF -0.4 - 2.7 △VKA=36V-10V -0.4 - 2.0 Unit V mV △VREF /△VKA Ratio of change in Reference input Voltage to the Change in Cathode Voltage IREF Reference Input Current R1=10KΩ, R2=∞ - 1.8 4 uA IREF(dev) Deviation of Reference Input Current Over Full Temperature Range R1=10KΩ, R2=∞ - 0.4 1.2 uA IK(min) Minimum Cathode Current for Regulation - 0.25 0.5 mA IK(off) Off-State Cathode Current VKA=40V, VREF=0 - 0.17 0.9 uA Dynamic Impedance IK=1mA to 100mA f≦1.0KHz - 0.27 0.5 Ω ZKA www.umw-ic.com TL431xx 3 mV/ V 友台半导体有限公司 UMW ‹ R UMW TL431 Test Circuit ‹ Typical Application Circuits Notes for Typical Application Circuits: 1. For the series regulator applications, add a compensation capacitor C1 between CATHODE and REF is strongly recommended to improve the stability of output voltage. 2. Set Vo according to the following equation: Vo=VREF(1+R1/R2)+IREFxR1. 3. Choose the Value for RB as below: (1). The maximum limit for RB should be such that the cathode current (IK) is greater than the minimum operating current (0.5mA) at VIN(MIN). (2). The minimum limit for RB should be such that the cathode current (IK) does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IK does not exceed 120mA. B B B www.umw-ic.com 4 友台半导体有限公司 UMW ‹ R UMW TL431 Typical Characteristics www.umw-ic.com 5 友台半导体有限公司 UMW ‹ R Typical Characteristics www.umw-ic.com UMW TL431 (Continued) 6 友台半导体有限公司 UMW ‹ R Typical Characteristics www.umw-ic.com UMW TL431 (Continued) 7 友台半导体有限公司 UMW ‹ R UMW TL431 Package Information SOT-23 www.umw-ic.com 8 友台半导体有限公司 UMW ‹ R UMW TL431 Package Information TO-92 www.umw-ic.com 9 友台半导体有限公司 UMW ‹ R UMW TL431 Package Information SOT-89 www.umw-ic.com 10 友台半导体有限公司 UMW ‹ R UMW TL431 Package Information SOP-8 www.umw-ic.com 11 友台半导体有限公司 UMW ‹ R UMW TL431 Package Information TO-92L (TAPE & REEL) A1 P T P A H W2 W W1 W0 H0 I1 H L1 H1 d D0 F1 F2 P2 P0 Millimeters Inches Dim. Min AL A T d I1 P PO P2 F1/F2 ∆h ∆P W W0 W1 W2 H H0 H1 DO L1 www.umw-ic.com Typ. Max. Min. Typ. 5.0 5.0 4.0 0.45 2.5 11.7 12.4 5.95 2.4 -1 -1 17.5 5.7 8.5 12.7 12.7 6.35 2.5 0 0 18.0 6 9 15.5 16 3.8 4.0 Max. 0.197 0.197 0.157 0.018 13.7 13 6.75 2.8 1 1 19.0 6.3 9.75 0.5 20 16.5 25 4.2 11 12 0.098 0.461 0.488 0.234 0.094 -0.039 -0.039 0.689 0.224 0.335 0.500 0.500 0.250 0.098 0 0 0.709 0.236 0.354 0.610 0.630 0.150 0.157 0.539 0.512 0.266 0.110 0.039 0.039 0.748 0.248 0.384 0.020 0.787 0.650 0.984 0.165 0.433 友台半导体有限公司