SI-8050SD-TL [SANKEN]
Switching Regulator/Controller;
| 型号： | SI-8050SD-TL |
| 厂家： | 
SANKEN ELECTRIC |
| 描述： | Switching Regulator/Controller |
| 文件： | 总2页 (文件大小：49K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
1-1-3 DC/DC Converter ICs
SI-8000SD Series Surface Mount, Separate Excitation Step-down Switching Mode
■Features
■Lineup
• Surface-mount package (TO263-5)
Part Number
SI-8033SD
3.3
SI-8050SD
5.0
VO (V)
• Output current: 3.0A
IO (A)
3
• High efficiency: 79% typ. (SI-8033SD), 84%
typ. (SI-8050SD)
■Absolute Maximum Ratings
• Requires only 4 discrete external components
Parameter
Symbol
Ratings
43*1
Unit
V
Conditions
• Internally-adjusted phase correction and
output voltage
DC Input Voltage
VIN
When mounted on glass-epoxy board 40 × 40 mm
Power Dissipation*2
PD
3
W
• Built-in reference oscillator (60kHz)
(copper area: 100%)
Junction Temperature
Tj
+125
–40 to +125
3
°C
°C
• Built-in overcurrent and thermal protection
circuits
Storage Temperature
Tstg
θj-c
Thermal Resistance (Junction to Case)
°C/W
• Output ON/OFF available
Thermal Resistance
(Junction to Ambient Air)
When mounted on glass-epoxy board 40 × 40 mm
(copper area: 100%)
θj-a
33.3
°C/W
• Soft start available by S.S pin
*1: 35V for SI-8033SD
*2: Limited by thermal protection circuit.
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
Parameter
Symbol
Unit
SI-8033SD
5.5 to 28
SI-8050SD
7 to 40
DC Input Voltage Range
VIN1
IO
V
A
Output Current Range*
0 to 3.0
Operating Junction Temperature Range
Operating Temperature Range*
Tjop
Top
–30 to +125
–30 to +125
°C
°C
*: Limited by Ta-PD characteristics.
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8033SD
SI-8050SD
Unit
min.
3.17
typ.
max.
3.43
min.
typ.
max.
5.2
VO
3.3
4.8
5.0
Output Voltage
V
Conditions
η
VIN=15V, IO=1A
VIN=20V, IO=1A
79
VIN=15V, IO=1A
60
84
Efficiency
%
Conditions
f
VIN=20V, IO=1A
60
Oscillation Frequency
Line Regulation
kHZ
mV
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
IS1
VIN=15V, IO=1A
25
VIN=20V, IO=1A
80
30
40
VIN=10 to 30V, IO=1A
10
100
40
VIN=8 to 28V, IO=1A
10
VIN=15V, IO=0.5 to 1.5A
±0.5
Load Regulation
mV
VIN=20V, IO=0.5 to 1.5A
Temperature Coefficient of Output Voltage
±0.5
mV/°C
Overcurrent Protection
Starting Current
3.1
20
3.1
20
A
V
Conditions
VSSL
VIN=15V
0.2
VIN=20V
0.2
Low-Level Voltage
Soft
Start Pin*
Outflow Current at
Low Voltage
ISSL
30
40
30
40
µA
Conditions
VSSL=0.2V
* Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to
this pin.
SI-8000SD
SI-8000SD
SI-8000SD
The output can also be turned ON/OFF with this pin.
The output is stopped by setting the voltage of this pin to VSSL or lower.
Soft-start pin voltage can be changed with an open-collector drive circuit of a transistor.
When using both the soft-start and ON/OFF functions together, the discharge current from C3
flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the
transistor if C3 capacitance is large.
5
ON/OFF
5
ON/OFF
C3
5
ON/OFF
C3
The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is
prohibited.
If this pin is not used, leave it open.
V
OUT. ON/OFF
Soft start
Soft start
+VOUT. ON/OFF
ICs
24
SI-8000SD Series
■External Dimensions (TO263-5)
(Unit : mm)
Case temperature
measurement point
10.0±0.2
(8.0)
Pin Assignment
(4.4)
q
w
e
r
t
VIN
(15°)
4.5±0.2
+0.10
–0.05
1.3
SWOUT
GND
VOS
3-R0.3
(2×R0.45)
(3°)
φ
1.5 Dp:±0.2
S.S
0.10±0.15
(3°)
(3°)
Plastic Mold Package Type
Flammability: 94V-0
2.4±0.2
(R0.3)
Product Mass: Approx. 1.48g
0.88±0.10
(R0.3)
0 to 6°
(0.5)
0.8±0.1
(1.7±0.25
)
0.8±0.1
(1.7±0.25
)
(1.7±0.25
)
(1.7±0.25
)
1
2
3
4
5
9.9±0.2
(3°)
(3°)
2-R0.3
10.0±0.02
■Block Diagram
■Reference Data
Copper Laminate Area on Glass Epoxy Board vs.
thermal resistance (junction to ambient air) (Typical Value)
1
VIN
SWOUT
2
Internal power
supply
Overcurrent
protection
55
50
Oscillator
Reset
With glass epoxy board of 40 × 40 mm
Latch & driver
45
Thermal
protection
Comparator
40
θ
VOS
4
35
Error
amplifier
30
0
200
400
600
800
1000 1200 1400 1600 1800
Reference voltage
Copper Laminate Area (mm2)
S.S
GND
5
3
■Typical Connection Diagram
L1
1
2
4
C1 : 50V/1000µF
C2 : 50V/1000µF
C3 : 0.01µF
VOUT
SWOUT
OS
VIN
VIN
V
SI-8000SD
(only when soft start function is used)
L1 : 150µH
D1 : SPB-G56 (Sanken)
+
+
S.S
GND
3
C1
C2
D1
5
C3
GND
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.
ICs
25
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