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參數(shù)資料
| 型號(hào)： | IRU431AL |
| 廠(chǎng)商： | International Rectifier |
| 英文描述： | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR |
| 中文描述： | 低電壓調(diào)節(jié)精密并聯(lián)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 47K |
| 代理商： | IRU431AL |
IRU431L / IRU431AL
4
Rev. 1.8
02/20/02
www.irf.com
APPLICATION INFORMATION
An example is given below on how to properly select the
biasing resistor.
Assuming:
V
MIN
= 4.5V
V
MAX
= 6V
V
KA
= 3.3V
I
L
= 10mA
The maximum value for the biasing resistor is calcu-
lated using the following equations:
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
Assuming R1 = 2K
as before,
The maximum power dissipation of the resistor is
calculated under the maximum supply voltage as
follows:
(V
MAX
- V
KA
)
R
B
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
external resistors according to the following formula:
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:
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
μ
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
and R1=2K
the
error due to the I
ADJ
is only 1mV which is about 0.03% of
the nominal set point.
Figure 3 - Typical application of the
IRU431L for programming the output voltage.
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:
V
MAX
= Maximum supply voltage
P
R
B
(MAX)
= Maximum R
B
power dissipation
P
R
B
(MAX)
= (6 - 3.3)
100
2
2
R
B(MAX)
=
I
B(MAX)
= I
K(MIN)
+ I
R
V
MIN
- V
KA
I
B(MAX)
+ I
L(MAX)
I
R
= 3.3 - 1.24
2
I
B(MAX)
= 0.08 + 1.03 = 1.11mA
R
B(MAX)
= 4.5 - 3.3
1.11 +10
Select R
B
= 100
V
IN
R2
Co
R1
R
B
IRU431L
I
K
R
L
I
L
V
KA
= V
OUT
o p
×
R1 + I
REF
×
R1
R2
Vo = V
KA
= V
REF
×
o
1 +
p
+ I
REF
×
R1
R1
R2
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| IRU431ALCL3 | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR |
| IRU431ALCL3TR | 功能描述:IC VREF SHUNT PREC ADJ SOT-23-3 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 基準(zhǔn)類(lèi)型:旁路，精度 輸出電壓:5V 容差:±0.5% 溫度系數(shù):100ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:80µA 電流 - 靜態(tài):- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商設(shè)備封裝:SOT-23-3 包裝:帶卷 (TR) 其它名稱(chēng):LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
| IRU431ALCL5 | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR |
| IRU431ALCL5TR | 制造商:International Rectifier 功能描述:IC, SHUNT REGULATOR, 1.24V, 1%, 5-SOT-23, Topology:Shunt, Reference Voltage:1.24 |
| IRU431ALCS | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:VOLT REGULATOR|ADJUSTABLE|+1.24 TO +15V|BIPOLAR|SOP|8PIN|PLASTIC |
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