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PDF SI-8008HFE Data sheet ( Hoja de datos )
| Número de pieza | SI-8008HFE | |
| Descripción | DC-to-DC Step-Down Converter | |
| Fabricantes | Sanken | |
| Logotipo |  |
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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
1 page  
SI-8008HFE
DC-to-DC Step-Down Converter
Thermal Performance Characteristics
The application must be designed to ensure that the TJ(max)
of the device is not exceeded during operation. To do so, it is
necessary to determine values for maximum power dissipation,
PD(max), and ambient temperature, TA(max).
PD can be calculated from input values:
where:
PD
= VO
⋅
I
O
⎜⎜⎝⎛
100
Hx
−
1⎟⎟⎠⎞
−
VF
⋅
I
O
⎜⎜⎝⎛1
−
VO
VIN
⎟⎟⎠⎞
VO is output voltage in V,
VIN is input supply voltage in V,
IO is output current in A,
ηx is IC efficiency in percent (varies with VIN and IO; refer to
efficiency performance curves for value), and
VF is forward voltage for the input diode, Di. In these tests,
the Sanken FMB G16L was used, at 0.55 V and IO = 5.5 A. For
application design, obtain thermal data from the datasheet for
the diode.
PD is substantially affected by the heat conductance properties of
the application, in particular any heatsink connected to the device
radiation fin. The relationships of PD, TA, and heatsink type is
represented in the Power Dissipation chart.
Because the heat dissipation capacity of the heatsink depends
substantively on how it is used in the actual application, thermal
characteristics of the application must be confirmed by testing.
The internal overtemperature protection circuit may enable when
TJ ≥ 130°C.
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
–40
Power Dissipation versus Ambient Temperature
Shin Etsu G746 silicon grease
Infinite heat sink
TJ(max) = 150°C
Infinite heat sink
TJ(max) = 125°C
Al heat sink
200 mm × 200 mm × 2 mm
RθJA = 2.3°C/W
TJ(max) = 125°C
Al heat sink
100 mm × 100 mm × 2 mm
RθJA = 5.2°C/W
TJ(max) = 125°C
Al heat sink
75 mm × 75 mm × 2 mm
RθJA = 7.6°C/W
TJ(max) = 125°C
No heat sink
TJ(max) = 150°C
No heat sink
TJ(max) = 125°C
–20 0
20 40 60 80
TA (°C)
6
Overtemperature
Protection:
Output Voltage versus
Junction Temperature
VIN = 15 V, IO = 10 mA
5
4
3
2
OTP On
1
OTP Off
0
0 20 40 60 80 100 120 140 160 180
TJ (°C)
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
5
5 Page 
DC-to-DC Step-Down Converter
SI-8008HFE
June, 2007
<Worldwide Contacts>
Asia Pacific
China
Sanken Electric Hong Kong Co., Ltd.
Suite 1026 Ocean Centre, Canton Road, Tsimshatsui, Kowloon, Hong Kong
Tel: 852-2735-5262
Fax: 852-2735-5494
Sanken Electric (Shanghai) Co., Ltd.
Room3202, Maxdo Centre, Xingyi Road 8, Changning district, Shanghai, China
Tel: 86-21-5208-1177
Fax: 86-21-5208-1757
India
Saket Devices Pvt. Ltd.
Office No.13, First Floor, Bandal - Dhankude Plaza, Near PMT Depot, Paud Road, Kothrud, Pune - 411 038, India
Tel: 91-20-5621-2340
91-20-2528-5449
Fax: 91-20-2528-5459
Japan
Sanken Electric Co., Ltd. Overseas Sales Headquaters
Metropolitan Plaza Bldg. 1-11-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-0021, Japan
Tel: 81-3-3986-6164
Fax: 81-3-3986-8637
Korea
Sanken Electric Korea Co., Ltd.
Mirae Asset Life Bldg. 6F, 168 Kongduk-dong, Mapo-ku, Seoul, 121-705, Korea
Tel: 82-2-714-3700
Fax: 82-2-3272-2145
Singapore
Sanken Electric Singapore Pte. Ltd.
150 Beach Road, #14-03 The Gateway West, Singapore 189720
Tel: 65-6291-4755
Fax: 65-6297-1744
Taiwan
Taiwan Sanken Electric Co., Ltd.
Room 1801, 18th Floor, 88 Jung Shiau East Road, Sec. 2, Taipei 100, Taiwan R.O.C.
Tel: 886-2-2356-8161
Fax: 886-2-2356-8261
Sanken Electric Co., Ltd.
I02-008EA-070703
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SI-8008HFE.PDF ] | |
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