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