SI-3000B Series
sExternal
Dimensions (TO220F-5)
φ
3.2
±0.2
0.5
(Unit : mm)
10.0
±0.2
4.2
2.8
±0.2
4.0
±0.2
7.9
±0.2
±0.2
a. Part Number
b. Lot Number
Pin Assignment
SI-3157B
q
GND
w
V
C
e
V
O
r
Sense
t
V
IN
16.9
±0.3
b
2.6
±0.1
(2.0)
0.95
±0.15
0.85
–0.1
(4.6)
+0.2
0.45
–0.1
P1.7
±0.7
×4=6.8
±0.7
+0.2
(8.0)
5.0
±0.6
(17.9)
a
SI-3025B
q
GND
w
V
C
e
V
O
r
A
DJ
t
V
IN
3.9
±0.7
(4.3)
8.2
±0.7
Plastic Mold Package Type
Flammability: UL94V-0
Product Mass: Approx. 2.3g
1 2 3 4 5
Forming No. 1101
sBlock
Diagram
SI-3157B
5
T
r1
3
MIC
5
SI-3025B
T
r1
3
MIC
4
Reg.
Reg.
4
Amp.
ON/OFF
ON/OFF
Protection
Protection
V
REF
Amp.
Drive
Drive
2
Equivalent
to LS-TTL
2
Equivalent
to LS-TTL
1
1
sTypical
Connection Diagram
SI-3157B
D
1
*
2
V
O
3
V
IN
5
+
DC Input
GND
*
1
C
1
C
2
OPEN
SI-3157B
2
1
4
+
C
0
DC Output
GND
SI-3025B
D
1
*
2
V
IN
5
+
DC Input
C
1
GND
3
SI-3025B
1
4
R
1
*
3
R
2
*
3
+
C
0
DC Output
GND
V
O
*
1
OPEN 2
C
2
C
0
: Output capacitor (47 to 100
µ
F)
*1 C
1
: Oscillation prevention capacitor
C
2
(Approx. C
1
: 47
µ
F, C
2
: 0.33
µ
F)
These capacitors are required if the input line contains inductance or
the wiring is long. Especially at low temperatures, tantalum capaci-
tors are recommended for C
1
and C
0
.
*2 D
1
: Protection diode
This diode is required for protection against reverse biasing of the
input and output. Sanken EU2Z is recommended.
*3 R
1
: External resistor for setting output voltage
The relation between output voltage V
O
and external resistors R
1
and
R
2
R
2
is as follows.
R
1
(V
ADJ
=2.55V(typ.))
V
O
=V
ADJ
• 1+
R
2
R
2
must be 2.55kΩ for stable operation.
sT
a
-P
D
Characteristics
15
Infinite heatsink
With Silicone Grease
Heatsink: Aluminum
20
0
×
20
0
×
2m
10
0
×
m
10
(2
0
×
.3
2m
°
C
m
75
/W
(5.
×
7
)
2
°
5
×
C/
2m
W
m
)
(7.
6
°
C
/W
)
Power Dissipation P
D
(W)
10
5
Without heatsink
0
–30
0
25
50
75
100
P
D
=I
O
•[V
IN
(mean)–V
O
]
Ambient Temperature T
a
(°C)
V
REF
ICs
27