TL431/A/L (KA431) PROGRAMMABLE SHUNT REGULATOR PROGRAMMABLE SHUNT REGULATOR The TL431/A/L are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vrer (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2 Active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement for zener diodes in many applications. FEATURES TO-92 1: Ret. 2: Anode 3: Cathode 8 DIP ; 4 Cathode 6: Anode 8: Ref. 1: 4 Programmable output voltage to 36 volts 23,4,7: N.C. Low dynamic output impedance 0.20 typical 8 SOP Sink currant capability of 1.0 to 100mA * Equivalent full-range temperature coefficient of 50ppm/C typical Temperature compensated for operation over full rated operating temperature range Low output noise voltage , Fast turn-on response 1: Cathode 2, 3, 6, 7: Anode & Ref. 4,5: NC, BLOCK DIAGRAM ORDERING INFORMATION posts cta 5 Device Operating Temperature Package REFERENCE | CATHODE TL431CLP -25 ~ + 85C TO-92 TL431N -25 ~ + 85C 8 DIP | TL431M -25 ~ + 85C 8 SOP L TL431ACLP -25 ~ + 85C TO-92 TL431AM 25 ~ + 85C 8 SOP CATHODE (K) TL431LCLP -25 ~ + 85C TO-92 REFERENCE (R) O- ANODE (A) sonprenapanapssanansannnpnanssnsasessecasanel Rev. B FAIRCHILD ree SEMICONDUCTOR -w 1999 Fairchild Semiconductor CorporationTL431/A/L (KA431) PROGRAMMABLE SHUNT REGULATOR ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified.) Characteristic Symbol Value Vv 37 -100~ + 150 Reference | 0.05~ + 10 Power Dissipation D, Z Suffix Package 770 N Suffix 1000 T -25~ +85 T -65 ~ + 150 RECOMMENDED OPERATING CONDITIONS Characteristic Symbol Min Typ Max Unit Cathode Voltage Via VRE 36 Vv Cathode Current lka 1.0 100 mA ELECTRICAL CHARACTERISTICS (Ta =+ 25C, unless otherwise specified) _ TL431 TL431A TL431L Characteristic Symbol Test Conditions 7 - - Unit Min | Typ | Max | Min] Typ | Max| Min | Typ | Max Reference Input Voltage Veer Vica=Vaer, lka=1OmA 2.440] 2.495] 2.550 | 2.470] 2.495] 2.520] 2.482] 2.495 | 2.508 Vv Deviation of Reference Input Voltage Over- DNeaee DT | Via=Vrer Ika=1OmA 45 17 45 17 4.5 17 mV Temperature (Note 1) Twins TaS Tuax Ratio of Change in DN az 0V-Vaee -10| -27 -1.0|-27 -1.0 | -27 Reference Input Voltage to the Change in Nr! hea Vga =10mA mV/W ang DN a=36V-10V 0.5 | -2.0 -0.5 | -2.0 0.5 | -2.0 Cathode Voltage Reference Input Current lReF Ika=10MA, Ry=10KQ, Ro=co 1.5 4 1.5 4 1.5 4 pA Deviation of Reference ka=tOmA, Ry=10KQ, Ro=co Input Current Over Dirperl/DT 17, =Full Range 0.4 1.2 04 | 1.2 0.4 1.2 HA Full Temperature Range Minimum Cathode Cur- rent for Regulation Ikaminy | Vka=VRer 0.45] 1.0 0.45 | 1.0 0.45 | 1.0 mA Off - Stage Cathode Current kacorr) | Vka=36V,Vrer=0 0.05] 1.0 0.05 | 1.0 0.05 | 1.0 pA Dynamic Impedance Via=Verer.lka=1 to 100mA Z 015] 0.5 0.15] 0.5 0.15 0.5 (Note 2) KA f 1.0KQ @ Tuin= -25 C, Tyax= +85 C sanseayeneneesrannnansannapeasanasasagsssnnanne a SEMICONDUCTOR -wTL431/A/L (KA431) PROGRAMMABLE SHUNT REGULATOR TEST CIRCUITS Fig. 1 Test Circuit for Vka=Vrer Fig. 2 Test Circuit for Vis>Vrer INPUT OAAA-7-O Via INPUT O 444-0 Via, { | he ay im 4 KA431 REF KAaa 3 VREF Re t VreFl VaasVner (1+RUR2) + Irer Bt Fig. 3 Test Circuit for Ikaorry INPUT OA O Via Ika torh KA431 sonprenapanapssanansannnpnanssnsasessecasanel FAIRCHILD a SEMICONDUCTOR =vTL431/A/L (KA431) PROGRAMMABLE SHUNT REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS Fig. 4 Cathode Current vs. Cathode Voltage Fig. 5 Cathode Current vs. Cathode Voltage 800 Vea = WREF x Vea = Veer Tas 25C 600 =z = q < lca gnanty = > 400 s = E g 6 6 4 3 3s 2 zg 70 / 3 s o 3 0 200 [ -2 -1 1 2 3 -1 1 2 3 Cathode Voltage (V) Fig. 6 Change In Reference Input Voltage vs. Cathode Voltage 100 tka = 10ma 70 Ta= 25C 40 20 Change in Reference Input Voltage (mV) A= 1mA Cathode Voltage {) Fig. 7 Dynamic Impedance Frequency S g 4 3 g 2 1 0.7 0.4 0.2 0.1 Qa 5 10 15 20 25 30 36 40 1K 10K 100K 1M 10M Cathode Voltage (Vv) Frequency (Hz) Fig. 8 Small Signal Voltage Amplification vs. Frequency Fig. 9 Pulse Response 70 6 T Tr = 25C 60 INPUT 5 50 g = : = + 4 e 8 z e S = 30 > 3 3 & 3 OUTPUT w 3 z 2 s = 10 2 ~ 1 0 -10 9 1 2 3 4 5 6 7 Frequency (H2) Time (25) sonprenapanapssanansannnpnanssnsasessecasanel a SEMICONDUCTOR =vTL431/A/L (KA431) PROGRAMMABLE SHUNT REGULATOR TYPICAL APPLICATIONS Fig. 10 Shunt Regulator VREF Fig.11 Output Control Fig-12 High Current for a Three-Terminal Shunt Regulator Fixed Regulator vi [4 KA7805 Vo = Re KA431 COMMON --O Vo=(L+ ) Veer y Vo=Vner(l+ ) Vo= (1+) Vac feb a Fig. 13 Current Limit or Fig. 14 Constant-Current Sink Current Source Mv Ret o vi O- ANY O | lo = KA431 FFs KAa31 x 4 \ _ VREF Ret > = VREF lio = Rs saanepsaseesapananapssansananssapssnsessrananel FAIRCHILD eee SEMICONDUCTOR =vTRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx ISOPLANAR CoolFET MICROWIRE CROSSVOLT POP E?CMOS PowerTrench FACT Qs FACT Quiet Series Quiet Series FAST SuperSOT-3 FASTr SuperSOT-6 GTO SuperSOT-8 HiSeC TinyLogic DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILDS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant into support device or system whose failure to perform can the body, or (b) support or sustain life, or (c) whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or This datasheet contains the design specifications for In Design product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.