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参数资料
| 型号： | IRU431LCL3TR |
| 厂商： | International Rectifier |
| 文件页数： | 4/9页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT PREC ADJ SOT-23 |
| 标准包装： | 1 |
| 基准类型： | 旁路，可调节，精度 |
| 输出电压： | 1.24 V ~ 15 V |
| 容差： | ±1% |
| 输入电压： | 最高 15V |
| 通道数： | 1 |
| 电流 - 阴极： | 80µA |
| 电流 - 输出： | 10mA |
| 工作温度： | 0°C ~ 70°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： | Micro3?/SOT-23 |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IRU431LCL3TR IRU431LCL3CT |
IRU431L
APPLICATION INFORMATION
Output Voltage Setting
The IRU431L can be programmed to any voltages in the
range of 1.24 to 15V with the addition of R1 and R2
An example is given below on how to properly select the
biasing resistor.
external resistors according to the following formula:
Assuming:
(
) + I
Vo = V KA = V REF
3 1+
R1
R2
REF
3 R1
V MIN = 4.5V
V MAX = 6V
V KA = 3.3V
( 1.240 ) 3 R1 + I
I B(MAX) + I L(MAX)
The IRU431L keeps a constant voltage of 1.240V be-
tween the Ref pin and Ground pin. By placing a resistor
R2 across these two pins a constant current flows
through R2, adding to the I REF current and into the R1
resistor producing a voltage equal to:
REF 3 R1
R2
which will be added to the 1.240V to set the output volt-
age as shown in the above equation. Since the input
bias current of the Ref pin is 0.5 m A max, it adds a very
small error to the output voltage and for most applica-
tions can be ignored. For example, in a typical 5V to
3.3V application where R2=1.21K V and R1=2K V the
error due to the I ADJ is only 1mV which is about 0.03% of
the nominal set point.
I L = 10mA
The maximum value for the biasing resistor is calcu-
lated using the following equations:
V MIN - V KA
R B(MAX) =
I B(MAX) = I K(MIN) + I R
Where:
V MIN = Minimum supply voltage
I L(MAX) = Maximum load current
I B(MAX) = Maximum bias current
I K(MIN) = Maximum value for the minimum
cathode current spec
I R = Current through R1
V IN
R B
I K
R1
I L
V KA = V OUT
Assuming R1 = 2K V as before,
3.3 - 1.24
I R = = 1.03mA
2
IRU431L
Co
R L
I B(MAX) = 0.08 + 1.03 = 1.11mA
R2
R B(MAX) =
4.5 - 3.3
1.11 +10
= 108 V
Select R B = 100 V
Figure 3 - Typical application of the IRU431L
for programming the output voltage.
The maximum power dissipation of the resistor is calcu-
lated under the maximum supply voltage as follows:
(V MAX - V KA )
Biasing Resistor (R B ) Selection
The biasing resistor R B is selected such that it does not
limit the input current under the minimum input supply
and maximum load and biasing current.
P R B (MAX)
Where:
=
R B
2
V MAX = Maximum supply voltage
P R B (MAX) = Maximum R B power dissipation
(6 - 3.3)
P R B (MAX) =
100
2
= 73mW
4
www.irf.com
Rev. 2.0
08/05/03
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相关代理商/技术参数 |
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| IRU431LCL5 | 制造商:IRF 制造商全称:International Rectifier 功能描述:LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR |
| IRU431LCL5TR | 功能描述:IC VREF SHUNT PREC ADJ SOT-23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:1 系列:- 基准类型:串联，精度 输出电压:4.5V 容差:±800µV 温度系数:1ppm/°C 输入电压:13.5 V ~ 22 V 通道数:1 电流 - 阴极:- 电流 - 静态:7mA 电流 - 输出:10mA 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:20-LCC 供应商设备封装:20-CLCC 包装:管件 |
| IRU431LCS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:VOLT REGULATOR|ADJUSTABLE|+1.24 TO +15V|BIPOLAR|SOP|8PIN|PLASTIC |
| IRUD360CW40 | 功能描述:整流器 400 Volt 360 Amp Common Cathode RoHS:否 制造商:Vishay Semiconductors 产品:Standard Recovery Rectifiers 配置: 反向电压:100 V 正向电压下降: 恢复时间:1.2 us 正向连续电流:2 A 最大浪涌电流:35 A 反向电流 IR:5 uA 安装风格:SMD/SMT 封装 / 箱体:DO-221AC 封装:Reel |
| IRUD400CW60 | 功能描述:整流器 600 Volt 400 Amp Common Cathode RoHS:否 制造商:Vishay Semiconductors 产品:Standard Recovery Rectifiers 配置: 反向电压:100 V 正向电压下降: 恢复时间:1.2 us 正向连续电流:2 A 最大浪涌电流:35 A 反向电流 IR:5 uA 安装风格:SMD/SMT 封装 / 箱体:DO-221AC 封装:Reel |
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