类型 |
稳压IC |
品牌 |
ws |
型号 |
tl431a |
封装 |
to-92 |
批号 |
12+ |
|
|
介绍: tl431是一个有良好的热稳定性能的三端可调分流基准电压源。它的输出电压用两个
电阻就可以任意地设置到从vref(2.5v)到36v范围内的任何值。该器件的典型动态阻抗为0.2ω,在很多应用中可以用它代替齐纳
二极管,例如,数字电压表,运放电路、可调压电源,开关电源等等。
特点:
?可编程输出电压为36v
?电压参考误差:±0.4% ,典型值@25℃(tl431b)
?低动态输出阻抗,典型0.22ω
?负载电流能力1.0ma to 100ma
?等效全范围温度系数50 ppm/℃典型
?温度补偿操作全额定工作温度范围
?低输出噪声电压
图1 to92封装引脚图
图2 8脚封装引脚功能
图3 sop-8贴片封装引脚图
图4 tl431符号及内部方框图
图5 tl431内部电路图
maximum ratings (full operating ambient temperature range applies, unless
otherwise noted.)最大额定值(环境温度范围适用,除非另有说明。 )
rating 参数symbol 符号数值unit 单位
cathode to anode voltage阴极阳极电压vka37v
cathode current range, continuous 阴极电流范围,连续ik–100 to +150ma
reference input current range, continuous 参考输入电流范围,连续iref–0.05 to +10ma
operatingjunctiontemperature工作结温tj150℃
operating ambient temperature range 操作环境温度范围tl431i,tl431ai, tl431bita–40 to +85℃
tl431c, tl431ac, tl431bc 0 to +70
storagetemperature range储存温度范围tstg–65 to +150℃
total power dissipation总耗散功率 常温@ ta = 25℃ derate above 25℃ ambient temperatured, lp后缀塑封pd0.70w
p后缀塑封1.10
dm 后缀塑封0.52
total power dissipation @ tc = 25℃ derate above 25℃ case temperature 总耗散功率 外壳温度d, lp后缀塑封pd1.5w
p后缀塑封3.0
recommended operating conditions建议操作条件
condition 条件symbol 符号min最大值max最小值unit 单位
cathode to anode voltage 阴极阳极电压vkavref36v
cathode current 阴极电流ik1.0100ma
thermal characteristics热特性
characteristic 特性symbol 符号d, lp后缀封装 p后缀封装 dm 后缀封装unit 单位
thermal resistance, junction–to–ambient 热阻,结点到环境rqja178114240℃/w
thermal resistance, junction–to–case 热阻,结到外壳rqjc8341–℃/w
electrical characteristics(ta=25℃, unless otherwise noted.)电气特性(25℃ ,除非另有说明。)
characteristic 特性symbol 符号tl431itl431cunit 单位
最小值典型值最大值最小值典型值最大值
reference input voltage (figure 1)参考输入电压 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参考输入电压偏差温度范围 (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) 参考输入电流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参考输入电流偏差温度范围 (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) 最小阴极电流调节imin–0.51.0–0.51.0ma
off–state cathode current (figure 3) vka = 36 v, vref = 0 v 断态阴极电流ioff–2601000–2601000na
dynamic impedance (figure 1, note 3)动态阻抗 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.)电气特性(25℃,除非另有说明。)
characteristic 特性 symbol 符号tl431aitl431actl431biunit 单位
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)参考输入电压 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) 参考输入电压偏差温度范围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)参考输入电流 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 = ∞ 参考输入电流偏差温度范围diref–0.82.5–0.41.2–0.82.5μa
minimum cathode current for regulation 最小阴极电流调节vka = vref (figure 1)imin–0.51.0–0.51.0–0.51.0ma
off–state cathode current(figure 3) 断态阴极电流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 动态阻抗|zka|–0.220.5–0.220.5–0.140.3ω
图6 测试电路vka = vref
图7 测试电路vka > vref
图8
测试电路for ioff
曲线图:
图9 阴极电流与阴极电压
图10 阴极电流与阴极电压
图11
参考输入电压与常温
图12
参考输入电流与常温
图13 变化的参考输入电压与阴极电压
图14 断态阴极电流随环境温度
图15 动态阻抗与频率
图16 动态阻抗随环境温度
图17
开环电压增益与频率
图18
谱噪声密度
图19
脉冲响应
图20
稳定的边界条件
应用法:
图21测试电路曲线a 边界条件的稳定性 图22曲线测试电路的b,c和d边界条件的稳定性
图23并联
稳压器电路图
图24 大电流并联稳压器电路
图25 控制三端固定稳压输出电路
图26 串联稳压调节电路
图27 过压保护电路
图28
恒流源电路
图29 恒定流入电流源电路
图30 双向
可控硅过压保护电路
图31
电压监视器电路
图32 单电源比较温度补偿电路
图33 线性欧姆表电路图
图34
简单的400毫瓦唱机
放大器电路
图35 高效率降压型开关转换器电路图
图36 简体tl431器件模型
图37
封装图
图38
sop-8贴片封装图