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SI-8000FD Datasheet, PDF (1/2 Pages) Sanken electric – Surface Mount, Separate Excitation Step-down Switching Mode | |||
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1-1-3 DC/DC Converter ICs
SI-8000FD Series Surface Mount, Separate Excitation Step-down Switching Mode
â Features
⢠Surface-mount package (TO263-5)
⢠Output current: 3.5 A
⢠High efficiency: 83% (Vo = 5 V, VIN = 15 V, Io = 2 A)
⢠Requires only 6 discrete components
⢠Built-in reference oscillator (300 kHz)
⢠Built-in drooping-type overcurrent and thermal
protection circuits
⢠Built-in soft start circuit (Output ON/OFF
available)
- SI-8001FDE
⢠Built-in on/off function (active Low)
- SI-8001FDL
⢠Low current consumption during off
- SI-8001FDL
â Applications
⢠DVD recorder, FPD-TV
⢠OA equipment, such as printers
⢠Onboard local power supplies
â Lineup
Part Number
VO(V)
IO(A)
Function
SI-8001FDE
Soft start
Variable(0.8 to 24)
3.5
SI-8001FDL
ON/OFF
â Absolute Maximum Ratings
Parameter
Ratings
Symbol
Unit
SI-8001FDE SI-8001FDL
Conditions
Input Voltage
VIN
ON/OFF Control Voltage
Vc
Power Dissipation*1
PD
Junction Temperature*2
Tj
Storage Temperature
Tstg
Thermal Resistance (Junction to Case) θj-c
Thermal Resistance (Junction to Ambient Air) θj-a
43
â
VIN
3
+150
â40 to +150
3*1
33.3*1
V
V
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board measuring 40Ã40 mm (copper laminate area: 100%)
When mounted on glass-epoxy board measuring 40Ã40 mm (copper laminate area: 100%)
When mounted on glass-epoxy board measuring 40Ã40 mm (copper laminate area: 100%)
*1 : Limited by thermal protection circuit
*2 : This product has built-in thermal protection circuits that may activate when the junction temperature exceeds 130°C.
The recommended design for the junction temperature during IC operation is below 125°C.
â Recommended Operating Conditions
Ratings
Parameter
Symbol
Unit
SI-8001FDE
SI-8050FDL
Input Voltage Range
7*/
Vo+3*1 to 40
V
Output Voltage Range
70
0.8 to 24
V
Output Current Range
*0
0 to 3.5
A
Operating Junction Temperature Range
5KPQ
â30 to +100
°C
Operating Temperature Range
5PQ
â30 to +85
°C
*1: The minimum value of the input voltage range is 4.5 V or Vo + 3 V, whichever is higher.
â Electrical Characteristics
(R1=4.2kâ¦, R2=0.8k⦠when Ta = 25°C and Vo=5V)
Parameter
Symbol
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
SS Pin*1
ON/OFF Pin*2
Low Level Voltage
Outflow Cuurent
at Low Voltage
ON/OFF Control Voltage (Output on)
ON/OFF Control Voltage (Output off)
ON/OFF Controll Current (Output on)
Quiescent Circuit Current
VADJ
Conditions
âVADJ/âT
Conditions
η
Conditions
fO
Conditions
âVOLINE
Conditions
âVOLOAD
Conditions
IS
Conditions
VSSL
ISSL
Conditions
Vc, IH
Vc, IL
Ic, IH
Conditions
Iq
Conditions
Iq(OFF)
Conditions
SIâ8001FDE
min.
typ.
max.
0.784
0.800
0.816
VIN=15V, Io=0.2A
±0.1
VIN=15V, Io=0.2A, Tc=0 to 100°C
83
VIN=15V, Io=2A
270
300
330
VIN=15V, Io=2A
80
VIN=10 to 30V, Io=2A
50
VIN=15V, Io=0.2 to 3.5A
3.6
VIN=15V
0.5
6
30
VIN=15V, VSS=0V
â
â
â
â
â
â
â
â
â
â
6
VIN=15V, Io=0A
200
600
VIN=15V, Vss=0V
Ratings
min.
0.784
270
3.6
â
â
â
2.0
SIâ8001FDL
typ.
max.
0.800
0.816
VIN=15V, Io=0.2A
±0.1
VIN=15V, Io=0.2A, Tc=0 to 100°C
83
VIN=15V, Io=2A
300
330
VIN=15V, Io=2A
80
VIN=10 to 30V, Io=2A
50
VIN=15V, Io=0.2 to 3.5A
VIN=15V
â
â
â
â
â
â
0.8
6
100
Vc=2V
6
VIN=15V, Io=0A
30
200
VIN=15V, Vc=2V
Unit
V
mV/ °C
%
kHz
mV
mV
A
V
µA
V
V
µA
mA
µA
*1: Pin 5 is the SS 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. SS-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
SS pin is pulled up (3.7 V typ.) to the power supply in the IC, so applying the external
voltage is prohibited. If this pin is not used, leave it open.
*2: Output is OFF when the output control terminal VC is open. Each input level is equivalent to
LS-TTL. Therefore, the device can be driven directly by LS-TTLs.
SI-8001FDE
5 SS
SI-8001FDE
5 SS
C3
SI-8001FDE
5 SS
C3
32 ICs
VO.ON/OFF
Soft start
Soft start
+Vo. On/OFF
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