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SI-3050F Datasheet PDF - Sanken electric

Part Number SI-3050F
Description 5-Terminal/ Multi-Function/ Full-Mold/ Low Dropout Voltage Dropper Type
Manufacturers Sanken electric 
Logo Sanken electric Logo 



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SI-3050F datasheet, circuit
qSI-3000F Series
SI-3000F Series
5-Terminal, Multi-Function, Full-Mold, Low Dropout Voltage Dropper Type
sFeatures
• Compact full-mold package (equivalent to TO220)
• Output current: 1.0A
• Low dropout voltage: VDIF1V (at IO=1.0A)
• Variable output voltage (rise only)
May be used for remote sensing (excluding SI-3025F)
• Output ON/OFF control terminal is compatible with LS-TTL. (It may be directly
driven by LS-TTL or standard CMOS logic.)
• Built-in foldback overcurrent, overvoltage, thermal protection circuits
• Variable output voltage type (SI-3025F) also available
sApplications
• For stabilization of the secondary stage of switching power supplies
• Electronic equipment
sAbsolute Maximum Ratings
Parameter
Symbol
DC Input Voltage
Voltage of Output Control Terminal
DC Output Current
Power Dissipation
Junction Temperature
Ambient Operating Temperature
Storage Temperature
Thermal Resistance (junction to case)
Thermal Resistance (junction to ambient air)
VIN
VC
IO
PD1
PD2
Tj
Top
Tstg
Rth(j-c)
Rth(j-a)
Ratings
SI-3050F SI-3090F/3120F SI-3150F/3157F SI-3240F SI-3025F
25 30 35 45 30
VIN
1.0*2
14(With infinite heatsink)
1.5(Without heatsink, stand-alone operation)
–40 to +125
–30 to +100
–40 to +125
7.0
66.7(Without heatsink, stand-alone operation)
(Ta=25°C)
Unit
V
V
A
W
W
°C
°C
°C
°C/W
°C/W
33

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SI-3050F equivalent
qSI-3000F Series
External Variable Output Voltage Circuit (Excluding SI-3025F)
1. Variable output voltage with a single external resistor
VIN
GND
5
+
OPEN
2
47µF
SI-3000F
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.), therefore the adjusted
output voltage VOUT is:
VO=V04+IREX•REX *V04: output voltage of SI-3000F 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-3000F
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.) 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:
VO-V04
V04
REX1=
REX2=
S•I4IN ,
(S-1)•I4IN
*V04: Output voltage of SI-3000F series
S: Stability coefficient of I4IN (may be set to any value)
Note: In the SI-3000F 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-3000F series.
35
VIN=VO+1V
30
25
20
15
10
5
SI-3240F
SI-3150F
SI-3120F
SI-3090F
SI-3050F
0 2 4 6 8 10
External Resistor REX (k)
35
VIN=VO+1V
30
25
20
15
10
5
SRI-E3X224=06Fk
SSRSIRE-IRX-3EI23-EX=13X230=521.79=202530.kF20kF5Fk
SRI-E3X20=510.2F5k
0 1.0 2.0
External Resistor REX1 (k)
37

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Information Total 6 Pages
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