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SI-8050S View Datasheet(PDF) - Sanken Electric co.,ltd.

Part Name
Description
Manufacturer
SI-8050S Datasheet PDF : 2 Pages
1 2
1-1-3 DC/DC Converter ICs
SI-8000S Series Full-Mold, Separate Excitation Step-down Switching Mode
Features
• Compact full-mold package (equivalent to
TO220)
• Output current: 3.0A
• High efficiency: 79 to 91%
• Requires only 4 discrete components
• Internally-adjusted phase correction and output
voltage
• Built-in reference oscillator (60kHz)
• Built-in overcurrent and thermal protection
circuits
• Built-in soft start circuit (Output ON/OFF
available)
Lineup
Part Number
VO(V)
IO(A)
SI-8033S
3.3
SI-8050S
5.0
SI-8090S
9.0
3.0
SI-8120S
12.0
Absolute Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
SW Terminal Applied Reverse Voltage
Thermal Resistance(junction to case)
Symbol
VIN
PD1
PD2
Tj
Tstg
VSW
θ j-c
*35V for SI-8033S
Ratings
43*
18(With infinite heatsink)
1.5(Without heatsink, stand-alone operation)
+125
–40 to +125
–1
5.5
Applications
• Power supplies for telecommunication equip-
ment
• Onboard local power supplies
Recommended Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range
Operating Junction Temperature Range
Symbol
VIN
IO
Tjop
SI-8033S
5.5 to 28
SI-8050S
7 to 40
Ratings
SI-8090S
12 to 40
0 to 3.0
–30 to +125
SI-8120S
15 to 40
SI-8150S
18 to 40
SI-8150S
15.0
Unit
V
W
W
°C
°C
V
°C/W
Unit
V
A
°C
Electrical Characteristics
Parameter
Output Voltage
SI-8000S*1
SI-8000SS
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of
Output Voltage
Symbol
VO
Conditions
η
Conditions
f
Conditions
VOLINE
Conditions
VOLOAD
Conditions
SI-8033S
min. typ. max.
3.17 3.30 3.43
3.234 3.30 3.366
VIN=15V, IO=1.0A
79
VIN=15V, IO=1.0A
60
VIN=15V, IO=1.0A
25
80
VIN=8 to 28V, IO=1.0A
10
30
VIN=15V, IO=0.5 to 1.5A
VO/Ta
±0.5
SI-8050S
min. typ. max.
4.80 5.00 5.20
4.90 5.00 5.10
VIN=20V, IO=1.0A
84
VIN=20V, IO=1.0A
60
VIN=20V, IO=1.0A
40
100
VIN=10 to 30V, IO=1.0A
10
40
VIN=20V, IO=0.5 to 1.5A
±0.5
Ratings
SI-8090S
min. typ. max.
8.55 9.00 9.45
VIN=21V, IO=1.0A
88
VIN=21V, IO=1.0A
60
VIN=21V, IO=1.0A
50
120
VIN=15 to 30V, IO=1.0A
10
40
VIN=21V, IO=0.5 to 1.5A
±1.0
SI-8120S
min. typ. max.
11.50 12.00 12.50
VIN=24V, IO=1.0A
90
VIN=24V, IO=1.0A
60
VIN=24V, IO=1.0A
60
130
VIN=18 to 30V, IO=1.0A
10
40
VIN=24V, IO=0.5 to 1.5A
±1.0
SI-8150S
min. typ. max.
14.25 15.00 15.75
VIN=25V, IO=1.0A
91
VIN=25V, IO=1.0A
60
VIN=25V, IO=1.0A
60
130
VIN=21 to 30V, IO=1.0A
10
40
VIN=25V, IO=0.5 to 1.5A
±1.0
(Ta=25°C)
Unit
V
%
kHZ
mV
mV
mV/ °C
Overcurrent Protection
Starting Current
IS1
3.1
3.1
3.1
3.1
3.1
Conditions
VIN=15V
VIN=20V
VIN=21V
VIN=24V
VIN=25V
A
Soft
Low-Level Voltage
VSSL
0.2
0.2
0.2
0.2
0.2
V
Start Pin*2
Outflow Current at
Low Voltage
ISSL
15
25
35
15
25
35
15
25
35
15
25
35 15
Conditions
VSSL=0.2V
25
35
µA
*1:“S” may be printed to the right of the marking (except SI-8090S, SI-8120S, SI-8150S).
*2:Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to
this pin.
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.
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.
SI-8000S
5 ON/OFF
VOUT. ON/OFF
SI-8000S
5 ON/OFF
C3
SI-8000S
5 ON/OFF
C3
Soft start
Soft start
+VOUT. ON/OFF
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