si-3150j Sanken Electric Co., Ltd., si-3150j Datasheet - Page 3

• Manufacturer Part Number: si-3150j
• Description: 5-terminal, Full-mold, Low Dropout Voltage Linear Regulator Ics
• Manufacturer: Sanken Electric Co., Ltd.

GSI-3000J Series
1. Variable output voltage with a single external resistor
The output voltage may be increased by inserting resistor R
terminals No.4 (sensing terminal) and No.3 (output terminal). The cur-
rent I
output voltage V
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
tween terminals No.4 (sensing terminal) and No.3 (output terminal) and
R
The current I
characteristics may be improved compared to the method shown in 1
by setting the external current I
of I
The adjusted output voltage V
The value of the external resistors may be obtained as follows:
*V
Note: In the SI-3000J series, the output voltage increase can be ad-
46
EX2
External Variable Output Voltage Circuit
04
S: Stability coefficient of I
GND
GND
4IN
V
V
: Output voltage of SI=3000J series
IN
IN
REX
between terminals No.4 and No.1 (ground terminal).
justed as mentioned above. However, when the rise is set to ap-
proximately 10V compared to output voltage V
output current may not be obtained due to the S.O.A. protection
circuit in the SI-3000J series.
(stability coefficient S=5).
flowing into terminal No.4 is 1mA (typ.), therefore the adjusted
V
V
I
R
REX1
+
+
O
O
EX1
=V
4IN
=V
47µF
47µF
=
=S•I
04
04
OUT
flowing into terminal No.4 is 1mA (typ.) so the thermal
OPEN
OPEN
+I
+R
V
S•I
4IN
REX
is:
O
EX1
-V
4IN
•R
•I
04
5
2
5
2
4IN
REX1
EX
(may be set to any value)
,
SI-3000J
SI-3000J
OUT
R
*V
REX1
EX2
1
04
1
in this case is:
: output voltage of SI-3000J series
=
at approximately 5 times the value
(S-1)•I
V
04
3
4
3
4
4IN
I
I
REX
REX1
I
4IN
V
V
R
R
R
04
04
04
EX
EX1
EX2
, the necessary
+
47µF
+
EX
47µF
between
EX1
V
V
GND
GND
O
O
be-
25
20
15
10
25
20
15
10
5
5
0
0
V
V
IN
IN
=V
=V
O
2
O
+1V
External Resistor R
+1V
External Resistor R
4
1.0
6
EX
EX1
(kΩ)
(kΩ)
8
2.0
10