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SI-3000C Datasheet(PDF) 6 Page - Sanken electric

Part No. SI-3000C
Description  5-Terminal, Multi-Function, Full-Mold, Low Dropout Voltage Dropper Type
Download  7 Pages
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Maker  SANKEN [Sanken electric]
Homepage  http://www.sanken-ele.co.jp/en
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SI-3000C Datasheet(HTML) 6 Page - Sanken electric

   
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44
1. Variable output voltage with a single external resistor
The output voltage may be increased by inserting resistor REX between
terminals No.4 (sensing terminal) and No.3 (output terminal). The cur-
rent IREX flowing into terminal No.4 is 1mA (typ.)(SI-3033C:0.43mA (typ.)),
therefore the adjusted output voltage VOUT is:
VO=V04+IREX•REX
*V04: output voltage of SI-3000C series
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
The output voltage may be increased by inserting resistors REX1 be-
tween terminals No.4 (sensing terminal) and No.3 (output terminal) and
REX2 between terminals No.4 and No.1 (ground terminal).
The current I4IN flowing into terminal No.4 is 1mA (typ.)(SI-3033C:
0.43mA(typ.)) so the thermal characteristics may be improved compared
to the method shown in 1 by setting the external current IREX1 at ap-
proximately 5 times the value of I4IN (stability coefficient S=5).
The adjusted output voltage VOUT in this case is:
VO=V04+REX1•IREX1
IREX1=S•I4IN
The value of the external resistors may be obtained as follows:
REX1=
VO-V04
REX2=
V04
S•I4IN
,
(S-1)•I4IN
*V04: Output voltage of SI-3000C series
S: Stability coefficient of I4IN (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 V04, 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
IREX
REX
47
µF47µF
VO
V04
VIN
++
GND
GND
OPEN
5
2
3
4
1
SI-3000C
IREX1
REX1
REX2
47
µF47µF
VO
I4IN
V04
VIN
++
35
20
25
30
15
10
5
0
2468
10
External Resistor REX (k
Ω)
VIN=VO+1V
SI-3240C
SI-3150C
SI-3120C
SI-3090C
SI-3050C
SI-3033C
External Resistor REX1 (k
Ω)
35
20
25
30
15
10
5
0
1.0
2.0
VIN=VO+1V
SI-3150C
REX2
=3.75k
SI-3033C
REX2=1.9k
SI-3050C
REX2
=1.25k
SI-3120C
REX2
=3k
SI-3090C
REX2
=2.25k
SI-3240C
REX2
=6k
qSI-3000C Series
External Variable Output Voltage Circuit


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