TL431中文資料簡介介紹:TL431是一個有優(yōu)秀的熱穩(wěn)固性能的三端可調分流基準電壓源。它的輸出電壓用兩個電阻就能夠隨意地設置到從Vref〔2.5V〕到36V范圍內的任何值。該器件的典型動向阻抗為

0.2Ω，在好多應用中能夠用它取代齊納二極管，比如，數(shù)字電壓表，運放電路、可調壓電源，開關電源等等。特色：?可編程輸出電壓為

36V?電壓參照偏差：±

0.4％

，典型值@25℃〔

TL431B〕?低動向輸出阻抗，典型

0.22Ω?負載電流才能

1.0mAto100mA?等效全范圍溫度系數(shù)50ppm/℃典型溫度賠償操作全額定工作溫度范圍?低輸出噪聲電壓圖1TO92封裝引腳圖圖28腳封裝引腳功能圖3SOP-8貼片封裝引腳圖圖4TL431符號及內部方框圖圖

5TL431

內部電路圖MAXIMUMRATINGS(Fulloperatingambienttemperaturerangeapplies,unless最大額定值〔環(huán)境溫度范圍合用，除非還有說明。otherwisenoted.)

〕Rating

參數(shù)

Symbol

數(shù)值

Unit符號單位CathodetoAnodeVoltage陰極陽極電壓VKA37VCathodeCurrentRange,Continuous陰極電流范圍，連續(xù)IK–100to+150mAReferenceInputCurrentRange,Continuous參照輸入電流范圍，連續(xù)Iref–0.05to+10mAOperatingJunctionTemperature工作結溫TJ150℃OperatingAmbientTL431I,TL431AI,TL431BI–40to+85TemperatureRange操作環(huán)境TA℃溫度范圍TL431C,TL431AC,TL431BC0to+70StorageTemperatureRange儲藏溫度范圍Tstg–65to+150℃TotalPowerDissipation總D,LP后綴塑封耗散功率常溫@TA=25℃P后綴塑封PD1.10WDerateabove25℃AmbientTemperatureDM后綴塑封TotalPowerDissipation@TCD,LP后綴塑封1.5=25℃Derateabove25℃PDWCaseTemperature總耗散功P后綴塑封率外殼溫度RECOMMENDEDOPERATINGCONDITIONS建議操作條件Condition條件SymbolMin最大值Max最小值Unit符號單位CathodetoAnodeVoltage陰極陽極電壓VKAVref36VCathodeCurrent陰極電流IK1.0100mATHERMALCHARACTERISTICS熱特征SymbolD,LP后綴封DM后綴封裝UnitCharacteristic特征裝P后綴封裝單位符號ThermalResistance,Junction–to–Ambient熱阻，結點到環(huán)RqJA178114240℃/W境ThermalResistance,8341–℃/WRqJCJunction–to–Case熱阻，結到外殼ELECTRICALCHARACTERISTICS(TA=25℃,unlessotherwisenoted.)電氣特征〔25℃，除非另有說明?！矯haracteristicReferenceInputVoltage(Figure參照輸入電壓VKA=Vref,IK=10mA

SymbolTL431ITL431C特征最小符號最小值典型值最大值典型值最大值值TA=25℃2.442.4952.552.442.4952.55TA=TlowtoVref–2.423–Thigh(Note1)

Unit單位VReferenceInputVoltageDeviationOverTemperatureRange參照輸入電–7.030–3.017壓傾向溫度范圍(Figure1,NotesDVref1,2)VKA=Vref,IK=10mARatioofChange△VKA=10Vto––1.4–2.7––1.4–2.7inReferenceVrefInputVoltageto△VrefChangeinCathode△VKAtoAnodeVoltage-–1.0–2.0△VKA=36Vto10V–IK=10mA(Figure2),ReferenceInputTA=25℃–1.84.0–1.84.0Current(Figure2)參照輸入電流TA=TlowtoIref––––5.2IK=10mA,R1=Thigh(Note1)10k,R2=∞ReferenceInputCurrentDeviationOverTemperatureRange參照輸入電–0.82.5–0.41.2流傾向溫度范圍(Figure2,Note1,DIref4)IK=10mA,R1=10k,R2=∞MinimumCathodeCurrentForRegulationVKA=Vref(Figure1)最Imin–0.51.0–0.51.0小陰極電流調理Off–StateCathodeCurrent(Figure3)VKA=36V,Vref=0V斷態(tài)陰Ioff–2601000–2601000極電流DynamicImpedance(Figure1,Note3)動向阻抗VKA=Vref,DIK=1.0mA|ZKA|–0.220.5–0.220.5to100mAf31.0kHzELECTRICALCHARACTERISTICS(TA=℃25,unlessotherwisenoted.)電氣特征〔25℃，除非還有說明。〕

mVmV/VAAmAnAΩTA=TlowtoThigh(Note1)VKA=Vref,△VKA=10VtoVref△VKA=36Vto10VTA=25℃參照輸入電Characteristic特征ReferenceTA=25℃InputVoltage(Figure1)參TA=Tlowto考輸入電壓ThighVKA=Vref,IK=10mAReferenceInputVoltageDeviationOverTemperatureRange(Figure1,Notes1,2)壓傾向溫度范圍IK=10mARatioofChangeinReferenceInputVoltagetoChangeinCathodetoAnodeVoltageIK=mA(Figure2),ReferenceInputCurrent(Figure2)參照輸入電流IK=10mA,R1=10k,R2=∞ReferenceInputCurrentDeviationOverTemperatureRange(Figure2,Note1)IK=10mA,R110k,R2=∞參照輸入電流傾向溫度范圍MinimumCathodeCurrentForRegulation最小陰極電流調理VKA=Vref(Figure1)

SymbolTL431AITL431ACTL431BIU最大符號最小值典型值最大值最小值典型值最大值最小值典型值值位2.472.4952.522.472.4952.522.4832.4952.507VrefV2.44––2.515DVref–7.030–3.017–3.017m––1.4–2.7––1.4–2.7––1.4–2.7VrefmVKA––––2.0Iref––1.84.0–1.84.0–1.12.0μ–6.5––––4.0DIref–0.82.5–0.41.2–0.82.5μImin–0.51.0–0.51.0–0.51.0mOff–StateCathodeCurrent(Figure3)斷態(tài)陰Ioff–2601000–2601000–230500nA極電流VKA=36V,Vref=0VDynamicImpedance(Figure1,Note3)VKA=Vref,DIK–0.220.5–0.220.5–0.140.3Ω|ZKA|1.0mAto100mAf31.0kHz動向阻抗圖

6

測試電路VKA=Vref

圖7

測試電路

VKA>Vref

圖8

測試電路

forIoff曲線圖：圖9陰極電流與陰極電壓圖10陰極電流與陰極電壓圖11參照輸入電壓與常溫圖12參照輸入電流與常溫圖13變化的參照輸入電壓與陰極電壓圖14斷態(tài)陰極電流隨環(huán)境溫度圖15動向阻抗與頻率圖16動向阻抗隨環(huán)境溫度圖17開環(huán)電壓增益與頻率圖18譜噪聲密度圖19脈沖響應圖20穩(wěn)固的界限條件應用法：圖21測試電路曲線a界限條件的穩(wěn)固性圖22曲線測試電路的B，C和D界限條件的穩(wěn)固性圖23并聯(lián)穩(wěn)壓器電路圖圖24大電流并聯(lián)穩(wěn)壓