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SI-8001FDE データシート(PDF) 6 Page - Sanken electric

部品番号 SI-8001FDE
部品情報  DC-to-DC Step-Down Converter
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メーカー  SANKEN [Sanken electric]
ホームページ  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SI-8001FDE データシート(HTML) 6 Page - Sanken electric

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6
SANKEN ELECTRIC CO., LTD.
DC-to-DC Step-Down Converter
SI-8001FDE
27469.056
Component Selection
VIN
1
GND
GND
2
4
3
GND
SS
IN
SW
ADJ
C1
C2
L1
Di
VO
R1
R2
IADJ
5
C3
Soft Start Only
SI-8001FDE
Component
Rating
C1
470 μF
C2
680 μF
C3
0.1 μF (For soft start function)
Di
SPB-G56S (Sanken)
L1
47 μH
All external components should be mounted as close as possible
to the SI-8001FDE. The ground of all components should be
connected at one point near GND pin (pin 3).
Recommended PCB Layout
Recommended Solder Pad Layout
Typical Application Diagram
Diode Di
A Schottky-barrier diode must be used for Di. If other
diode types are used, such as fast recovery diodes, the IC may be
destroyed because of the reverse voltage applied by the recovery
voltage or ON voltage.
Choke Coil L1
If the winding resistance of the choke coil is too
high, the efficiency may be reduced below rating. Because the
overcurrent protection start current is approximately 4.2 A, atten-
tion must be paid to the heating of the choke coil by magnetic
saturation due to overload or short-circuited load.
Capacitors C1, C2, and C3
Because for SMPS, large ripple
currents flow across C1 and C2, capacitors with high frequency
and low impedance must be used. If the impedance of C2 is too
high, the switching waveform may not be normal at low tempera-
tures. Do not use either OS or tantalum types of capacitors for
C2 or C3, because the extremely low ESR causes an abnormal
oscillation.
The device is stabilized, and for proper operation, C1 must be
located close to the device (see layout diagram, below). C3 is
required only if the soft start function is used. If not using soft-
start, leave the SS terminal open. A pull-up resistor is provided
inside the IC.
Resistor Bridge
R1 and R2 comprise the resistor bridge for the
output voltage, VO, and are calculated as follows:
() () ) , and
(
()
Ω
×
==
=
Ω
×
=
=
k
I
V
R2
V
I
V
V
R1
ADJ
ADJ
O
ADJ
ADJ
O
8
.
0
10
1
8
.
0
10
1
8
.
0
3
3
IADJ should always be set to 1 mA. Note that R2 should always be
present to ensure stable operation, even if VO, is set to 0.8 V (that
is, even if there is no R1). VO should be at least VIN + 8%.
6.8±0.1
11±0.2
9±0.2
9±0.1
3.7±0.05
4±0.1
1.7±0.1
1±0.05
(mm)


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