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8001FFE View Datasheet(PDF) - Sanken Electric co.,ltd.

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Description
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8001FFE
SANKEN
Sanken Electric co.,ltd. SANKEN
8001FFE Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
SI-8001FFE
DC-to-DC Step-Down Converter
Component Selection
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, because those cause an abnormal oscillation.
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 pro-
vided inside the IC.
Resistor Bridge R1 and R2 comprise the resistor bridge for the
output voltage, VO, and are calculated as follows:
R1 =
(VOVADJ )
IADJ
=
(VO 0.8)
1×103
(Ω)
,
and
R2 =
VA D J
IA D J
=
0.8
1×103
= 0.8 (kΩ)
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%.
Typical Application Diagram
VIN
GND
1
IN
2
SW
SI-8001FFE
4
ADJ
SS GND
C1 5
3
C3
Soft Start Only
L1
R1
IADJ
Di
R2
VO
C2
GND
Component
C1
C2
C3
Di
L1
Rating
470 μF
680 μF
0.1 μF (For soft start function)
RK-46 (Sanken)
47 μH
Recommended PCB Layout
GND
GND
U1
C1
C2
C3 S1
Vin C1
C2
U1
R2 R1
S1
C3
D1
D1
Vadj/Vos
R1
Vout
Vin
R2
Vadj/Vos
Vout
Vsw
L1
L1
Vsw
All external components should be mounted as close as possible
to the SI-8001FFE. The ground of all components should be
connected at one point.
Sanken Electric Co., Ltd.
6
3-6-3 Kitano, Niiza-shi, Saitama-ken
352-8666, Japan
Phone:+81-48-472-1111
http://www.sanken-ele.co.jp
 

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