SI-8000SD Series
sExternal
Dimensions (TO263-5)
Case temperature
measurement point
(0.40)
1.2
(Unit : mm)
10.0
±0.2
9.90
(15°)
±0.2
±0.2
(8.0)
4.5
3-R0.3
±0.2
(4.4)
1.3
+0.10
–0.05
(1.75)
(6.8)
±0.2
9.2±
±0.3
15.3
(3°)
±0.1
0.10
(3°)
15.30
±0.15
±0.3
9.2
±0.2
φ
1.5 Dp:
±0.2
(3°)
(2×R0.45)
Pin Assignment
q
V
IN
w
SW
OUT
e
GND
r
V
OS
t
S.S
Plastic Mold Package Type
Flammability: 94V-0
Product Mass: Approx. 1.48g
(4.6)
2.4
(R0.3)
±0.3
±0.2
±0.2
2.0
(0.75)
4.9
0.88
±0.10
(R0.3)
2.54
0~6
°
±0.1
(0.5)
(1.7
±0.25
)
1
2
3
4
5
0.8
±0.25
(1.7
)
±0.1
(1.7
±0.25
)
0.8
±0.25
(1.7
)
(3°)
2-R0.3
10.0
±0.02
(3°)
sBlock
Diagram
sReference
Data
Copper Laminate Area on Glass Epoxy Board vs.
thermal resistance (junction to ambient air) (Typical Value)
1
V
IN
Internal power
supply
SW
OUT
Overcurrent
protection
2
Thermal resistance (junction to ambient air)
θ
j-a (°C/W)
55
50
With glass epoxy board of 40
×
40 mm
45
40
35
30
0
Oscillator
Reset
Latch & driver
Comparator
Thermal
protection
V
OS
Error
amplifier
4
4.9
±0.2
Reference voltage
200
400
600
800
1000
1200
1400
1600
1800
Copper Laminate Area (mm
2
)
S.S
5
3
GND
sTypical
Connection Diagram
L1
V
IN
1
V
IN
SW
OUT
2
4
+
D1
V
OUT
SI-8000SD
C
1
+
S.S
5
C
3
GND
GND
3
V
OS
C
2
C
1
: 50V/1000
µ
F
C
2
: 50V/1000
µ
F
C
3
: 0.01
µ
F
(only when soft start function is used)
L
1
: 150
µ
H
D
1
: SPB-G56 (Sanken)
GND
Diode D
1
• Be sure to use Schottky-barrier diode as D
1
.
If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage generated by the recovery voltage or ON
voltage.
Choke coil L
1
• If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.
• As the overcurrent protection starting current is about 3.5 A, take care concerning heat radiation from the choke coil caused by magnetic saturation
due to overload or short-circuited load.
Capacitors C
1
, C
2
, and C
3
• As large ripple currents flow through C
1
and C
2
, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use.
Especially when the impedance of C
2
is high, the switching waveform may become abnormal at low temperatures.
For C
2
, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may
cause an abnormal oscillation.
• C
3
is a capacitor for soft start. Leave pin 5 open if the soft start function is not used.
This pin is pulled up with a pull-up resistor inside the ICs.
To create the optimum operating conditions, place the components as close as possible to each other.
ICs
55
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