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| 型号： | TLV431AH6TA |
| 厂商： | Diodes Inc |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT ADJ SC-70-6 |
| 标准包装： | 3,000 |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 供应商设备封装： | SC-70-6 |
| 包装： | 带卷 (TR) |
A Product Line of
Diodes Incorporated
TLV431
Application Notes (cont.)
Printed Circuit Board Layout Considerations (cont.)
V OUT = V REF ? 1 +
?
?
?
R1 ?
R 2 ?
R 3 =
V IN ? ( V OUT + V BE )
I B
? I OUT (max) ?
? < I B ≤ 18 mA
?
?
? ?
? h FE (min) ?
R S =
V REF
I OUT (max)
Figure 5. Series Regulator with Current Limit
Figure 5 adds current limit to the series regulator in Figure 4 using a second TLV431. For currents below the limit, the circuit works normally
supplying the required load current at the design voltage. However should attempts be made to exceed the design current set by the second
TLV431, the device begins to shunt current away from the base of Q1. This begins to reduce the output voltage and thus ensuring that the output
current is clamped at the design value. Subject only to Q1’s ability to withstand the resulting power dissipation, the circuit can withstand either a
brief or indefinite short circuit.
V OUT = V REF ? 1 +
?
?
?
R1 ?
R 2 ?
V OUT ≥ ( V REG + V REF )
?
(All features of the regulator
such as short circuit protection,
thermal shutdown, etc, are
maintained.)
Figure 6. Increasing Output Voltage of a Fixed Linear Regulator
One of the useful applications of the TLV431 is in using it to improve the accuracy and/or extend the range and flexibility of fixed voltage
regulators. In the circuit in Figure 6 above both the output voltage and its accuracy are entirely determined by the TLV431, R1 and R2. However
the rest of the features of the regulator (up to 5A output current, output current limiting and thermal shutdown) are all still available.
TLV431
Document number: DS32088 Rev. 6 - 2
10 of 14
October 2012
? Diodes Incorporated
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相关代理商/技术参数 |
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|---|---|
| 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 |
| TLV431AIDBVR | 功能描述:基准电压& 基准电流 Lw V Adj 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 |
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