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PDF SI-8001FFE Data sheet ( Hoja de datos )
| Número de pieza | SI-8001FFE | |
| Descripción | DC-to-DC Step-Down Converter | |
| Fabricantes | Sanken | |
| Logotipo |  |
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SI-8001FFE
DC-to-DC Step-Down Converter
Features and Benefits
▪ 3.5 A output current supplied in a small, through-hole
mount power package
▪ High efficiency: 83% at VIN= 15 V, IO= 2.0 A,VO= 5 V
▪ Requires only six external components (optional soft
start requires an additional capacitor)
▪ Oscillation circuit built-in (frequency 300 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-8001FFE DC voltage regulator is a DC-to-DC buck
convertor that attains an oscillation frequency of 300 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-8001FFE 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
27469.057
Functional Block Diagram
VIN 1 IN
C1
PReg
Overcurrent
Protection
SW 2
L1
Di
RK-46
(Sanken)
VOUT
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
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
1 page  
SI-8001FFE
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 RK46 was used, at 0.5 V and IO = 3.5 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.
Power Dissipation versus Ambient Temperature
Shin Etsu G746 silicon grease
24
22
Infinite heat sink
TJ(max) = 150°C
20
Infinite heat sink
18 TJ(max) = 125°C
16 Al heat sink
200 mm × 200 mm × 2 mm
14
RθJA = 2.3°C/W
TJ(max) = 125°C
12 Al heat sink
100 mm × 200 mm × 2 mm
10 RTJθ(JmA =ax5).2=°C12/W5°C
8
Al heat sink
75 mm × 75 mm × 2 mm
6 RθJA = 7.6°C/W
TJ(max) = 125°C
4 No heat sink
TJ(max) = 150°C
2
No heat sink
0 TJ(max) = 125°C
–40 –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)
27469.057
SANKEN ELECTRIC CO., LTD.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SI-8001FFE.PDF ] | |
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