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SI-8008HFE Schematic ( Datenblatt PDF ) - Sanken

Teilenummer SI-8008HFE
Beschreibung DC-to-DC Step-Down Converter
Hersteller Sanken
Logo Sanken Logo 

Gesamt 12 Seiten
		
SI-8008HFE Datasheet, Funktion
SI-8008HFE
DC-to-DC Step-Down Converter
Features and Benefits
5.5 A output current supplied in a small, through-hole
mount power package
High efficiency: 83% at VIN= 15 V, IO= 3.0 A,VO= 5 V
Requires only seven external components (optional soft
start requires an additional capacitor)
Oscillation circuit built-in (frequency 150 kHz typical)
Constant-current mode overcurrent protection circuit and
overtemperature protection circuit built-in
Soft start function built-in (can be implemented as an
on/off function; output-off state at low level)
Low current consumption during output-off state
Package: TO220F-5
Description
The SI-8008HFE DC voltage regulator is a DC-to-DC buck
convertor that attains an oscillation frequency of 150 kHz,
and has an integrated miniaturized choke coil, allowing it to
serve as a small, high efficiency power supply in a compact
TO220F package.
The internal switching regulator function provides high
efficiency switching regulation without any need for adjustment.
The device requires only six external support components. The
optional soft start function requires an additional capacitor.
Optional on/off control can be performed using a transistor.
The SI-8008HFE includes overcurrent and overtemperature
protection circuits.
Applications include:
DVD recorder
FPD TV
Telecommunications equipment
Office automation equipment, such as printers
On-board local power supply
Output voltage regulator for second stage of SMPS
(switched mode power supply)
Not to scale
Functional Block Diagram
VIN 1 IN
C1 C4
PReg
Overcurrent
Protection
SW 2
L1
Di
FMB-G16L
(Sanken)
VOU
C2
5 SS
On/Off
Soft Start
C3
Reset
Osc
Comparator
Error
Amplifier
Latch and
Driver
Overtemperature
Protection
ADJ 4
R1
R2
GND
3
Reference
Voltage
27469.060-I






SI-8008HFE Datasheet, Funktion
SI-8008HFE
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 6.5 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, C3, and C4 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
temperatures. Do not use either OS or tantalum types of capaci-
tors for C2, because those cause an abnormal oscillation.
The device is stabilized, and for proper operation, C1 and C4
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 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-8008HFE
4
ADJ
SS GND
C1 C4 5 3
C3
Soft Start Only
L1
R1
IADJ
Di R2
VO
C2
GND
Component
C1
C2
C3
C4
Di
L1
Rating
1500 μF
1000 μF
0.1 μF (For soft start function)
4.7 μF (RPER11H475K5)
FMB-G16L (Sanken)
100 μH
Recommended PCB Layout
U1
C1
C4
GND
GND
C2 C3 S1
C1
Vin
C4
U1
C2
R1
S1
C3
D1
D1
R2
R1
Vadj/Vos
Vout
Vin
R2
Vadj/Vos
Vout
Vsw L1
L1
Vsw
All external components should be mounted as close as possible
to the SI-8008HFE. The ground of all components should be
connected at one point.
Sanken Electric Co., Ltd.
3-6-3 Kitano, Niiza-shi, Saitama-ken
352-8666, Japan
Phone:+81-48-472-1111
http://www.sanken-ele.co.jp
6

6 Page







SI-8008HFE pdf, datenblatt
DC-to-DC Step-Down Converter
SI-8008HFE
Europe
United Kingdom
Sanken Power Systems (UK) Limited
Pencoed Technology Park Pencoed, Bridgend CF35 5HY. UK
Tel: 44-1656-869-100
Fax: 44-1656-869-162
North America
United States
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Worcester, Massachusetts 01606, U.S.A.
Tel: 1-508-853-5000
Fax: 1-508-853-3353
Allegro MicroSystems, Inc. (Southern California)
14 Hughes Street, Suite B105, Irvine, CA 92618
Tel: 1-949-460-2003
Fax: 1-949-460-7837
June, 2007
Sanken Electric Co., Ltd.
I02-008EA-070703

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