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SI-8033SD 数据表(PDF) 2 Page - Sanken electric

部件名 SI-8033SD
功能描述  Surface Mount, Separate Excitation Step-down Switching Mode
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-8033SD 数据表(HTML) 2 Page - Sanken electric

  SI-8033SD Datasheet HTML 1Page - Sanken electric SI-8033SD Datasheet HTML 2Page - Sanken electric  
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25
ICs
SI-8000SD Series
■External Dimensions (TO263-5)
(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
9.9
±0.2
Case temperature
measurement point
(15°)
(0.5)
2-R0.3
10.0
±0.02
3-R0.3
(R0.3)
(R0.3)
0.88
±0.10
1.5 Dp:
±0.2
φ
(1.7
±0.25)
12345
(1.7
±0.25)
0.8
±0.1
4.5
±0.2
1.3
0.10
±0.15
2.4
±0.2
+0.10
–0.05
(3°)
(3°)
(3°)
(3°)
(3°)
0 to 6°
(2×R0.45)
(1.7
±0.25)
(1.7
±0.25)
0.8
±0.1
10.0
±0.2
(4.4)
(8.0)
■Block Diagram
4
3
5
GND
S.S
2
VIN
SWOUT
VOS
1
Reset
Latch & driver
Thermal
protection
Oscillator
Comparator
Error
amplifier
Internal power
supply
Overcurrent
protection
Reference voltage
■Reference Data
Copper Laminate Area on Glass Epoxy Board vs.
thermal resistance (junction to ambient air) (Typical Value)
55
50
45
40
35
30
0200
400
600
800
1000
Copper Laminate Area (mm
2)
1200
1400
1600
1800
With glass epoxy board of 40 × 40 mm
■Typical Connection Diagram
VIN
C1
C3
D1
L1
C2
VIN
GND
S.S
GND
SI-8000SD
SWOUT
VOS
12
4
3
5
+
+
VOUT
GND
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.
C1 : 50V/1000µF
C2 : 50V/1000µF
C3 :0.01µF
(only when soft start function is used)
L1 : 150µH
D1 : SPB-G56 (Sanken)


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