50

1. Variable output voltage with a single external resistor

terminals No.4 (sensing terminal) and No.3 (output terminal). The cur-

However, the built-in 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

tween terminals No.4 (sensing terminal) and No.3 (output terminal) and

characteristics may be improved compared to the method shown in 1

The value of the external resistors may be obtained as follows:

,

Note: In the SI-3000J series, the output voltage increase can be ad-

justed as mentioned above. However, when the rise is set to ap-

output current may not be obtained due to the S.O.A. protection

circuit in the SI-3000J series.

GND

GND

OPEN

5

2

3

4

1

SI-3000J

47

µF47µF

++

GND

GND

OPEN

5

2

3

4

1

SI-3000J

47

µF47µF

++

25

20

15

10

5

02468

10

Ω)

SI-3150J

SI-3120J

SI-3090J

SI-3050J

Ω)

25

20

15

10

5

0

1.0

2.0

SI-3150J

=3.75k

Ω

SI-3120J

R

EX2

=3k

Ω

SI-3050J

R

EX2

=1.25k

Ω

SI-3090J

R

EX2

=2.25k

Ω

qSI-3000J Series

External Variable Output Voltage Circuit