12
Ratings
Parameter
Symbol
STR20005
Unit
min
typ
max
V
IN
8
40
Condition
I
O
=1.0A
V
O
5.0
5.1
5.2
Condition
V
IN
=20V, I
O
=1.0A
72
Condition
V
IN
=20V, I
O
=1.0A
V
OLINE
50
Condition
V
IN
=15 to 25V, I
O
=1.0A
V
OLOAD
100
Condition
V
IN
=20V, I
O
=0.5 to 1.5A
R
REJ
45
Condition
f=100 to 120Hz
f
30
Condition
V
IN
=20V, I
O
=1.0A
s
Electrical Characteristics (Ta=25
C)
DC Input Voltage Range
V
Output Voltage
V
Efficiency
%
Line Regulation
mV
Load Regulation
mV
Ripple Rejection
dB
Switching Frequency
kHz
Switching Type
Chopper Self Oscillation Type
External View
s
Absolute Maximum Ratings (Ta=25
C)
Ratings
STR20005
DC Input Voltage
V
IN
45
V
DC Output Current
I
O
2.0 (pulse 3.0)
A
55 (T
C
=25
C)
13 (T
C
=100
C)
Operating Temperature
T
op
20 to +100
C
Storage Temperature
T
stg
20 to +125
C
Thermal Resistance (junction-to-case)
R
th(j-c)
1.8
C/W
Parameter
Symbol
Unit
Power Dissipation
P
D
W
STR20000
Series
Features
q
Requires only 4 external components
q
Small size and high efficiency
q
Low switching noise
q
Variable output voltage
q
Use of Sanken semiconductors components ensures
high reliability
Applications
q
For power supplies in office equipment such as
electronic typewriters, printers and copiers
q
For power supplies in VCRs, personal CB radios
(fixed stations), etc.
13
s
Outline Drawing/Terminal Connections (unit: mm)
s
Block Diagram
s
Standard External Circuit
s
Typical Operating Characteristics
Rise Characteristics
Efficiency Characteristics
Ta-PD Characteristics
Note: Dimensions marked with
are measured at the roots of the leads.
Plastic Mold Package Type
Flammability: UL94V-0
Terminal Connections
q
Output Voltage Adjustment
w
Output Voltage Detection
e
Switching Output (backside of case)
r
Input
t
Ground
Weight: Approx. 8.2 g
*
Use VR
1
and VR
2
only when adjusting the output voltages.
VR
1
: V
out
down
VR
2
: V
out
up
RU3M forward voltage : 0.7V
15.4
0.3
4.5
0.2
1.0
0.1
1.6
0.2
1.2
0.15
17.8
0.3
q w e r t
4.0
0.1
2.54
0.1
2.54
0.1
3.81
+0.2
0.1
0.1
3.81
0.1
0.6
+0.2
0
0.6
9.9
0.2
Type
STR
Lot number
3.2
0.2
(18)
5.0
0.2
23.0
0.3
28.0
0.3
3.2
0.1
2.0
0.1
3.4
max.
(38.0)
(15.0)
(12.7)
(7.62)
(43.0)
7.0
0.2
36
5
5
5
5
5
Start
Circuit
Reference
Voltage
4
3
2
1
5
R5
R3
R2
MIC1
R1
R4
C1
Tr
1
10
8
6
4
2
0
0 2 4 6
1A
8 10
Input Voltage V
IN
(V)
Output Voltage V
O
(V)
12 14 16 18 20
Ta=25
C
I
O
0A
2A
100
90
80
70
60
50
40
30
20
10
0
Output Current I
O
(A)
Efficiency
(%)
0
0.5
1
1.5
2
2.5
Ta=25
C
V
IN
8V
20V
30V
40V
25
20
15
10
5
0
Ambient Temperature Ta (
C)
Power Dissipation P
D
(W)
20
0
20
40
60
80 100
150
150
2 (3.3
C/w)
100
100
2 (5.2
C/w)
75
75
2 (7.6
C/w)
Without heatsink
Without Mica
With Silicone Grease
Heatsink: Aluminum
Unit: mm
+
+
4
5
3
2
1
Di
RU3M
1000
F
1000
F
L=200
H
GND
GND
DC Output
DC Input
V
OUT
V
IN
VR1
VR2
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