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SI-3000J 数据表(PDF) 5 Page - Sanken electric

部件名 SI-3000J
功能描述  5-Terminal, Multi-Function, Full-Mold, Low Dropout Voltage Dropper Type
Download  6 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-3000J 数据表(HTML) 5 Page - Sanken electric

  SI-3000J Datasheet HTML 1Page - Sanken electric SI-3000J Datasheet HTML 2Page - Sanken electric SI-3000J Datasheet HTML 3Page - Sanken electric SI-3000J Datasheet HTML 4Page - Sanken electric SI-3000J Datasheet HTML 5Page - Sanken electric SI-3000J Datasheet HTML 6Page - Sanken electric  
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50
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.), therefore the adjusted
output voltage VOUT is:
VO=V04+IREX•REX
*V04: output voltage of SI-3000J 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.) so the thermal
characteristics may be improved compared to the method shown in 1
by setting the external current IREX1 at approximately 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=3000J series
S: Stability coefficient of I4IN (may be set to any value)
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-
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-3000J series.
GND
GND
OPEN
5
2
3
4
1
SI-3000J
IREX
REX
47
µF47µF
VO
V04
VIN
++
GND
GND
OPEN
5
2
3
4
1
SI-3000J
IREX1
REX1
REX2
47
µF47µF
VO
I4IN
V04
VIN
++
25
20
15
10
5
02468
10
External Resistor REX (k
Ω)
VIN=VO+1V
SI-3150J
SI-3120J
SI-3090J
SI-3050J
External Resistor REX1 (k
Ω)
25
20
15
10
5
0
1.0
2.0
VIN=VO+1V
SI-3150J
REX2
=3.75k
SI-3120J
R
EX2
=3k
SI-3050J
R
EX2
=1.25k
SI-3090J
R
EX2
=2.25k
qSI-3000J Series
External Variable Output Voltage Circuit


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