參數(shù)資料
型號(hào)： R1154N038B
廠商： Ricoh Co., Ltd.
英文描述： 150mA Voltage Regulator (Wide Input Voltage Range)
中文描述： 150mA的穩(wěn)壓器（寬輸入電壓范圍）
文件頁(yè)數(shù)： 17/23頁(yè)
文件大小： 783K
代理商： R1154N038B
R1154x
The Output Voltage of Regulator in R1154xxxxC may be adjustable for any output voltage between its
2.5V reference and its V
DD
setting level. An external pair of resistors is required, as shown in Figure 1.
The complete equation for the output voltage is described step by step as follows;
I1
=
I
IC
+
I2.....................................................................................................................................(1)
I2
=
2.5/R2 ..................................................................................................................................(2)
Thus,
I1
=
I
IC
+2.5/R2.............................................................................................................................(3)
Therefore,
V
OUT
=
2.5+R1
×
I1........................................................................................................................(4)
Put Equation (3) into Equation (4),then
V
OUT
=
2.5+R1(I
IC
+2.5/R2)
=
2.5(1+R1/R2)+R1
×
I
IC
.......................................................................................................(5)
In 2nd term, or R1
×
I
IC
will produce an error in V
OUT
.
In Equation (5),
I
IC
=
2.5/R
IC
..................................................................................................................................(6)
R1
×
I
IC
=
R1
×
2.5/R
IC
=
2.5
×
R1/R
IC
....................................................................................................................(7)
For better accuracy, choosing R1 (<<R
IC
) reduces this error.
Adjustable Resister Dependence of Output Voltage (Topt
=
25
°
C)
R2=10k
17
0.0
24.0
22.0
20.0
16.0
14.0
8.0
6.0
2.0
4.0
12.0
10.0
18.0
0
20
60
80
40
100
R1Resistance (k
)
O
O
(
0.0
24.0
22.0
20.0
16.0
14.0
8.0
6.0
2.0
4.0
12.0
10.0
18.0
0
200
600
800
400
1000
R1 Resistance (k
)
O
O
(
R2=100k
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