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參數(shù)資料
| 型號： | SI-3240C |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 5-Terminal, Multi-Function, Full-Mold, Low Dropout Voltage Dropper Type |
| 中文描述： | 5，終端，多功能，全模，低壓差滴管類型 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 94K |
| 代理商： | SI-3240C |
40
1. Variable output voltage with a single external resistor
The output voltage may be increased by inserting resistor R
EX
between
terminals No.4 (sensing terminal) and No.3 (output terminal). The cur-
rent I
REX
flowing into terminal No.4 is 1mA (typ.)(SI-3033C:0.43mA (typ.)),
therefore the adjusted output voltage V
OUT
is:
V
O
=V
04
+I
REX
R
EX
*V
04
: output voltage of SI-3000C series
However, the internal resistor (between terminals No. 4 and No.1) is a
semiconductor resistor, which has approximately thermal characteris-
tics of +0.2%/
°
C.
It is important to keep the thermal characteristics in mind when adjust-
ing the output voltage.
2. Variable output voltage with two external resistors
The output voltage may be increased by inserting resistors R
EX1
be-
tween terminals No.4 (sensing terminal) and No.3 (output terminal) and
R
EX2
between terminals No.4 and No.1 (ground terminal).
The current I
4IN
flowing into terminal No.4 is 1mA (typ.)(SI-3033C:
0.43mA (typ.)) so the thermal characteristics may be improved com-
pared to the method shown in 1 by setting the external current I
REX1
at
approximately 5 times the value of I
4IN
(stability coefficient S=5).
The adjusted output voltage V
OUT
in this case is:
V
O
=V
04
+R
EX1
I
REX1
I
REX1
=S
I
4IN
The value of the external resistors may be obtained as follows:
R
= V
O
-V
04
R
= V
04
S
I
4IN
, (S-1)
I
4IN
*V
04
: Output voltage of SI-3000C series
S: Stability coefficient of I
4IN
(may be set to any value)
Note: In the SI-3000C series, the output voltage increase can be ad-
justed as mentioned above. However, when the rise is set to ap-
proximately 10V compared to output voltage V
04
, the necessary
output current may not be obtained due to the S.O.A. protection
circuit in the SI-3000C series.
GND
GND
OPEN
5
2
3
4
1
SI-3000C
I
REX
R
EX
47
μ
F
47
μ
F
V
O
V
04
V
IN
+
+
GND
GND
OPEN
5
2
3
4
1
SI-3000C
I
REX1
R
EX1
R
EX2
47
μ
F
47
μ
F
V
O
I
4IN
V
04
V
IN
+
+
35
20
25
30
15
10
5
0
2
4
6
8
10
O
O
(
External Resistor R
EX
(k
)
V
IN
=V
O
+1V
SI-3240C
SI-3150C
SI-3120C
SI-3090C
SI-3050C
SI-3033C
External Resistor R
EX1
(k
)
35
20
25
30
15
10
5
0
1.0
2.0
O
O
(
V
IN
=V
O
+1V
SI-3150C
SI-3120C
SI-3090C
R
SI-3033C
SI-3050C
SI-3=6k
R
EX2
G
SI-3000C Series
External Variable Output Voltage Circuit
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