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SI-3000B Series
■External Dimensions
(Unit : mm)
φ3.2 ±0.2
4.2 ±0.2
10.0 ±0.2
4.0 ±0.2
7.9 ±0.2
(2.0)
(17.9)
2.8 ±0.2
a
b
2.6 ±0.1
0.95 ±0.15
0.85 +0.2
–0.1
0.45 +0.2
–0.1
P1.7 ±0.7 ×4=6.8 ±0.7 3.9 ±0.7 (4.3)
8.2 ±0.7
(4.6)
(8.0)
5.0 ±0.6 16.9 ±0.3 0.5
a. Part Number
b. Lot Number
Pin Assignment
SI-3157B
q GND
w VC
e VO
r Sense
t VIN
SI-3025B
q GND
w VC
e VO
r ADJ
t VIN
Plastic Mold Package Type
Flammability: UL94V-0
Product Mass: Approx. 2.3g
1 2 3 4 5
Forming No. 1101
■Block Diagram
SI-3157B
SI-3025B
5
Tr1
3
5
Tr1
3
MIC
4
MIC
Reg.
Reg.
4
2
ON/OFF
Protection
Drive
Amp.
VREF
2
ON/OFF
Protection
Drive
Amp.
VREF
Equivalent
to LS-TTL
Equivalent
to LS-TTL
1
1
■Typical Connection Diagram
SI-3157B
D1
*2
VIN
VO
5
3
OPEN SI-3157B
+
*1
2 4 +
DC Input
1
C0 DC Output
C1
C2
GND
GND
SI-3025B
D1 *2
VIN
VO
5
3
OPEN SI-3025B R1
+ *1
2 4
*3 +
DC Input C2
1
C0 DC Output
C1
R2
*3
GND
GND
C0 : Output capacitor (47 to 100µF)
*1 C1 : Oscillation prevention capacitor
C2 (Approx. C1: 47µF, C2: 0.33µF)
These capacitors are required if the input line contains inductance or
the wiring is long. Especially at low temperatures, tantalum capacitors
are recommended for C1 and C0.
*2 D1 : Protection diode
This diode is required for protection against reverse biasing of the
input and output. Sanken EU2Z is recommended.
*3 R1 : External resistor for setting output voltage
R2 The relation between output voltage VO and external resistors R1 and
R2 is as follows.
VO=VADJ • 1+ R1
(VADJ=2.55V(typ.))
R2
R2 must be 2.55kΩ for stable operation.
■Ta-PD Characteristics
15
Infinite heatsink
With Silicone Grease
Heatsink: Aluminum
Power Dissipation PD (W)
10
5
Without heatsink
200×200×2mm (2.3°C/W)
100×100×2mm (5.2°C/W)
75×75×2mm (7.6°C/W)
0
–30 0 25 50 75 100
Ambient Temperature Ta (°C)
PD=IO•[VIN(mean)–VO]
IC
33