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SI-3033C View Datasheet(PDF) - Sanken Electric co.,ltd.

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SI-3033C Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
qSI-3000C Series
External Variable Output Voltage Circuit
1. Variable output voltage with a single external resistor
VIN
GND
5
+
OPEN
2
47µF
SI-3000C
1
3
IREX
4
VO
REX
V04
+
47µF
GND
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
VIN
GND
5
+
OPEN
2
47µF
SI-3000C
1
3
IREX1
4
I4IN
VO
REX1
V04
REX2
+
47µF
GND
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:
VO-V04
V04
REX1=
REX2=
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.
35
VIN=VO+1V
30
25
20
15
10
5
SI-3240C
SI-3150C
SI-3120C
SI-3090C
SI-3050C
SI-3033C
0
2
4
6
8
10
External Resistor REX (k)
35
VIN=VO+1V
30
25
20
15
10
5
SRI-E3X224=06Ck
SRSIE-RX3I2-E=13X3521.7=0253kC0kΩΩC
SRI-E3X20=920.2C5k
SRI-E3X20=510.2C5k
SRIE-X320=13.39Ck
0
1.0
2.0
External Resistor REX1 (k)
44
 

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