類(lèi)型 |
穩(wěn)壓IC |
品牌 |
ws |
型號(hào) |
tl431a |
封裝 |
to-92 |
批號(hào) |
12+ |
|
|
介紹: tl431是一個(gè)有良好的熱穩(wěn)定性能的三端可調(diào)分流基準(zhǔn)電壓源。它的輸出電壓用兩個(gè)
電阻就可以任意地設(shè)置到從vref(2.5v)到36v范圍內(nèi)的任何值。該器件的典型動(dòng)態(tài)阻抗為0.2ω,在很多應(yīng)用中可以用它代替齊納
二極管,例如,數(shù)字電壓表,運(yùn)放電路、可調(diào)壓電源,開(kāi)關(guān)電源等等。
特點(diǎn):
?可編程輸出電壓為36v
?電壓參考誤差:±0.4% ,典型值@25℃(tl431b)
?低動(dòng)態(tài)輸出阻抗,典型0.22ω
?負(fù)載電流能力1.0ma to 100ma
?等效全范圍溫度系數(shù)50 ppm/℃典型
?溫度補(bǔ)償操作全額定工作溫度范圍
?低輸出噪聲電壓
圖1 to92封裝引腳圖
圖2 8腳封裝引腳功能
圖3 sop-8貼片封裝引腳圖
圖4 tl431符號(hào)及內(nèi)部方框圖
圖5 tl431內(nèi)部電路圖
maximum ratings (full operating ambient temperature range applies, unless
otherwise noted.)最大額定值(環(huán)境溫度范圍適用,除非另有說(shuō)明。 )
rating 參數(shù)symbol 符號(hào)數(shù)值unit 單位
cathode to anode voltage陰極陽(yáng)極電壓vka37v
cathode current range, continuous 陰極電流范圍,連續(xù)ik–100 to +150ma
reference input current range, continuous 參考輸入電流范圍,連續(xù)iref–0.05 to +10ma
operatingjunctiontemperature工作結(jié)溫tj150℃
operating ambient temperature range 操作環(huán)境溫度范圍tl431i,tl431ai, tl431bita–40 to +85℃
tl431c, tl431ac, tl431bc 0 to +70
storagetemperature range儲(chǔ)存溫度范圍tstg–65 to +150℃
total power dissipation總耗散功率 常溫@ ta = 25℃ derate above 25℃ ambient temperatured, lp后綴塑封pd0.70w
p后綴塑封1.10
dm 后綴塑封0.52
total power dissipation @ tc = 25℃ derate above 25℃ case temperature 總耗散功率 外殼溫度d, lp后綴塑封pd1.5w
p后綴塑封3.0
recommended operating conditions建議操作條件
condition 條件symbol 符號(hào)min最大值max最小值unit 單位
cathode to anode voltage 陰極陽(yáng)極電壓vkavref36v
cathode current 陰極電流ik1.0100ma
thermal characteristics熱特性
characteristic 特性symbol 符號(hào)d, lp后綴封裝 p后綴封裝 dm 后綴封裝unit 單位
thermal resistance, junction–to–ambient 熱阻,結(jié)點(diǎn)到環(huán)境rqja178114240℃/w
thermal resistance, junction–to–case 熱阻,結(jié)到外殼rqjc8341–℃/w
electrical characteristics(ta=25℃, unless otherwise noted.)電氣特性(25℃ ,除非另有說(shuō)明。)
characteristic 特性symbol 符號(hào)tl431itl431cunit 單位
最小值典型值最大值最小值典型值最大值
reference input voltage (figure 1)參考輸入電壓 vka = vref, ik = 10 ma
ta = 25℃vref2.44 2.495 2.55 2.442.4952.55 v
ta = tlow to thigh (note 1)2.41–2.582.423–2.567
reference input voltage deviation over temperature range參考輸入電壓偏差溫度范圍 (figure 1, notes 1, 2) vka= vref, ik = 10 madvref–7.030–3.017mv
ratio of change in reference input voltage to change in cathode to anode voltage ik = 10 ma (figure 2),△vka = 10 v to vref △vref
△vka– –1.4–2.7 – –1.4 –2.7mv/v
△vka=36v to 10 v-–1.0–2.0––1.0–2.0
reference input current (figure 2) 參考輸入電流ik = 10 ma, r1 = 10k, r2 = ∞ ta = 25℃iref– 1.8 4.0 – 1.84.0μa
ta = tlow to thigh (note 1)––6.5– –5.2
reference input current deviation over temperature range參考輸入電流偏差溫度范圍 (figure 2, note 1, 4) ik = 10 ma, r1 = 10 k, r2 = ∞diref–0.82.5–0.41.2μa
minimum cathode current for regulation vka = vref (figure 1) 最小陰極電流調(diào)節(jié)imin–0.51.0–0.51.0ma
off–state cathode current (figure 3) vka = 36 v, vref = 0 v 斷態(tài)陰極電流ioff–2601000–2601000na
dynamic impedance (figure 1, note 3)動(dòng)態(tài)阻抗 vka = vref, dik=1.0ma to 100ma f 3 1.0khz|zka|–0.220.5–0.220.5ω
electrical characteristics (ta = 25℃, unless otherwise noted.)電氣特性(25℃,除非另有說(shuō)明。)
characteristic 特性 symbol 符號(hào)tl431aitl431actl431biunit 單位
最小值典型值最大值最小值典型值最大值最小值典型值最大值
reference input voltage (figure 1)參考輸入電壓 vka = vref, ik = 10 mata = 25℃vref2.472.495 2.52 2.47 2.495 2.52 2.483 2.495 2.507v
ta = tlow to thigh2.44–2.552.453–2.5372.4752.4952.515
reference input voltage deviation over temperature range (figure 1, notes 1, 2) 參考輸入電壓偏差溫度范圍vka= vref, ik = 10 madvref–7.030–3.017–3.017mv
ratio of change in reference input voltage to change in cathode to anode voltage ik = 10 ma (figure 2), △vka = 10 v to vref△vref
△vka– –1.4 –2.7 – –1.4 –2.7 – –1.4 –2.7mv/v
△vka = 36 v to 10 v––1.0–2.0––1.0–2.0––1.0–2.0
reference input current (figure 2)參考輸入電流 ik = 10 ma, r1 = 10 k, r2 = ∞ ta = 25℃iref–
–1.8 4.0– 1.8 4.0 – 1.1 2.0μa
ta = tlow to thigh (note 1)
–6.5––5.2––4.0
reference input current deviation over temperature range (figure 2, note 1) ik = 10 ma, r1 = 10k, r2 = ∞ 參考輸入電流偏差溫度范圍diref–0.82.5–0.41.2–0.82.5μa
minimum cathode current for regulation 最小陰極電流調(diào)節(jié)vka = vref (figure 1)imin–0.51.0–0.51.0–0.51.0ma
off–state cathode current(figure 3) 斷態(tài)陰極電流vka = 36v, vref =0vioff–2601000–2601000–230500na
dynamic impedance (figure 1, note 3) vka = vref, dik = 1.0 ma to 100 ma f 3 1.0 khz 動(dòng)態(tài)阻抗|zka|–0.220.5–0.220.5–0.140.3ω
圖6 測(cè)試電路vka = vref
圖7 測(cè)試電路vka > vref
圖8
測(cè)試電路for ioff
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
參考輸入電壓與常溫
圖12
參考輸入電流與常溫
圖13 變化的參考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(dòng)態(tài)阻抗與頻率
圖16 動(dòng)態(tài)阻抗隨環(huán)境溫度
圖17
開(kāi)環(huán)電壓增益與頻率
圖18
譜噪聲密度
圖19
脈沖響應(yīng)
圖20
穩(wěn)定的邊界條件
應(yīng)用法:
圖21測(cè)試電路曲線a 邊界條件的穩(wěn)定性 圖22曲線測(cè)試電路的b,c和d邊界條件的穩(wěn)定性
圖23并聯(lián)
穩(wěn)壓器電路圖
圖24 大電流并聯(lián)穩(wěn)壓器電路
圖25 控制三端固定穩(wěn)壓輸出電路
圖26 串聯(lián)穩(wěn)壓調(diào)節(jié)電路
圖27 過(guò)壓保護(hù)電路
圖28
恒流源電路
圖29 恒定流入電流源電路
圖30 雙向
可控硅過(guò)壓保護(hù)電路
圖31
電壓監(jiān)視器電路
圖32 單電源比較溫度補(bǔ)償電路
圖33 線性歐姆表電路圖
圖34
簡(jiǎn)單的400毫瓦唱機(jī)
放大器電路
圖35 高效率降壓型開(kāi)關(guān)轉(zhuǎn)換器電路圖
圖36 簡(jiǎn)體tl431器件模型
圖37
封裝圖
圖38
sop-8貼片封裝圖