參數(shù)資料
型號： R1130HXXXX
英文描述： Power Management ICs
中文描述： 電源管理IC
文件頁數(shù)： 19/20頁
文件大小： 261K
代理商： R1130HXXXX
Rev. 1.11 -19-
R1130X501B
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
0
20
40
60
80
100
120
140
160
180
200
Time (us)
O
O
(
-250
-200
-150
-100
-50
0
50
100
150
O
O
V
IN
=6.0V
C
IN
=1.0uF
C
OUT
=0.1uF
Output Voltage
Output Current
I
APPENDIX
* Technical Notes on Output Voltage Setting of C type
Figure 1. Adjustable Regulator (C type)
The Output Voltage of Regulator in R1130XXXXC may be adjustable for any output voltage between its 1.8V
reference and its V
DD
setting level. An external pair of resistors is required, as shown in Figure 1.
R3
ADJ
GND
R
IC
I
IC
R2
I2
I3
V
OUT
1.8V
V
OUT
The complete equation for the output voltage is described step by step as follows;
I
2
=I
IC
+I
3
(1)
I
3
=1.8/R
3
(2)
Thus,
I
2
= I
IC
+1.8/R
3
(3)
Therefore,
V
OUT
=1.8+R
2
×
I
2
(4)
Put Equation (3) into Equation (4), then
V
OUT
=1.8+R
2
×
(I
IC
+2.0/R3)
In 2
nd
term, or R2
×
IIC will produce an error in V
OUT.
In Equation (5),
I
IC
=1.8/R
IC
=1.8
×
(1+R
2
/R
3
)+R
2
×
I
IC
(5)
(6)
R
2
×
I
IC
=R
2
×
2.0/R
IC
For better accuracy, choosing R
2
(<<R
IC
) reduces this error.
=1.8
×
R
2
/R
IC
(7)
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