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| 型号： | TLV431AFTA |
| 厂商： | Diodes Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT ADJ SOT-23 |
| 标准包装： | 1 |
| 基准类型： | 分流器，可调式 |
| 输出电压： | 1.24 V ~ 18 V |
| 容差： | ±1% |
| 输入电压： | 最高 18V |
| 通道数： | 1 |
| 电流 - 阴极： | 100µA |
| 电流 - 输出： | 15mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 其它名称： | TLV431AFTADKR |
A Product Line of
Diodes Incorporated
TLV431
Application Notes (cont.)
Printed Circuit Board Layout Considerations
The TLV431 in the SOT25 package has the die attached to pin 2, which results in an electrical contact between pin 2 and pin 5. Therefore, pin 2
of the SOT25 package must be left floating or connected to pin 5.
TLV431 in the SC70-6 (SOT363) package has the die attached to pin 2 and 5, which results in an electrical contact between pins 2, 5 and pin 6.
Therefore, pins 2 and 5 must be left floating or connected to pin 6.
Other Applications of the TLV431
R3
V in
V out
V OUT = V REF ? 1 +
?
R4
R1
?
?
R1 ?
R 2 ?
V IN ? V OUT
R 4 =
I B
TLV431 ?
ZXTP2039F
Q1
V REF
R 3 =
I SH + I B
V BE
I B
?
? < I B ≤ 15 mA
?
C1
0.1μF
I SH
R2
? I SH
?
? h FE (min)
?
?
GND
Figure 3. High Current Shunt Regulator
It may at times be required to shunt-regulate more current than the 15mA that the TLV431 is capable of.
Figure 3 shows how this can be done using transistor Q1 to amplify the TLV431’s current. Care needs to be taken that the power dissipation
and/or SOA requirements of the transistor is not exceeded.
V OUT = V REF ? 1 +
?
?
?
R1 ?
R 2 ?
?
R 3 =
V IN ? ( V OUT + V BE )
I B
? I OUT (max)
? < I B ≤ 15 mA
?
?
?
? h FE (min)
?
?
Figure 4. Basic Series Regulator
A very effective and simple series regulator can be implemented as shown in Figure 4 above. This may be preferable if the load requires more
current than can be provided by the TLV431 alone and there is a need to conserve power when the load is not being powered. This circuit also
uses one component less than the shunt circuit shown in Figure 3 above.
TLV431
Document number: DS32088 Rev. 6 - 2
9 of 14
October 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLV431AH6TA | 功能描述:基准电压& 基准电流 1.24V 1% V-REF ADJ RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| TLV431AID | 功能描述:基准电压& 基准电流 LV Adj Prec Shunt RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| TLV431AID | 制造商:Texas Instruments 功能描述:IC SM SHUNT REGULATOR ADJ +2.5/36V |
| TLV431AID | 制造商:Texas Instruments 功能描述:SHUNT REG ADJ +2.5/36V SOIC8 431 |
| TLV431AIDBV | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS |
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