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SI-8033SD View Datasheet(PDF) - Sanken Electric co.,ltd.

Part Name
Description
Manufacturer
SI-8033SD Datasheet PDF : 2 Pages
1 2
SI-8000SD Series
External Dimensions (TO263-5)
(15°)
φ1.5 Dp:±0.2
Case temperature
measurement point
3-R0.3
4.5±0.2
1.3
+0.10
–0.05
(3°)
10.0±0.2
(8.0)
(4.4)
(2×R0.45)
0.88±0.10
(1.7±0.25)
12
(3°)
34
9.9±0.2
0.8±0.1
(1.7±0.25)
5
(3°)
2-R0.3
10.0±0.02
(3°)
(R0.3)
0.10±0.15
(3°)
2.4±0.2
(R0.3)
0 to 6°
(0.5)
(1.7±0.25)
0.8±0.1
(1.7±0.25)
(Unit : mm)
Pin Assignment
q VIN
w SWOUT
e GND
r VOS
t S.S
Plastic Mold Package Type
Flammability: 94V-0
Product Mass: Approx. 1.48g
Block Diagram
1 VIN
Internal power
supply
Oscillator
Overcurrent
protection
SWOUT 2
Reset
Latch & driver
S.S
5
Comparator
Thermal
protection
Error
amplifier
Reference voltage
GND
3
VOS 4
Reference Data
Copper Laminate Area on Glass Epoxy Board vs.
thermal resistance (junction to ambient air) (Typical Value)
55
50
With glass epoxy board of 40 × 40 mm
45
40
35
30
0
200 400 600 800 1000 1200 1400 1600 1800
Copper Laminate Area (mm2)
Typical Connection Diagram
VIN
C1
1
VIN
2
SWOUT
4
SI-8000SD VOS
+ S.S GND
5
3
L1
D1
C3
GND
VOUT
+
C2
GND
C1 : 50V/1000µF
C2 : 50V/1000µF
C3 : 0.01µF
(only when soft start function is used)
L1 : 150µH
D1 : SPB-G56 (Sanken)
Diode D1
• Be sure to use Schottky-barrier diode as D1.
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 L1
• 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 C1, C2, and C3
• As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use.
Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures.
For C2, 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.
• C3 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 25
 

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