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PDF SI-8008TM Data sheet ( Hoja de datos )
| Número de pieza | SI-8008TM | |
| Descripción | DC-to-DC Step-Down Converter | |
| Fabricantes | Sanken | |
| Logotipo |  |
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SI-8008TM
DC-to-DC Step-Down Converter
Features and Benefits
▪ 1.5 A output current supplied in a small power surface
mount package
▪ High efficiency: 81% at VIN= 15 V, IO= 0.5 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 type overcurrent protection circuit and
an overheating protection circuit built in
▪ Soft start function built-in (can be implemented as an
ON/OFF function, output OFF state at low level)
▪ Low consumption current during output OFF state
Package: TO252-5 (SC-63)
Description
The SI-8008TM 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
TO252-5 (SC-63) package.
The switching regulator function realizes a high efficiency
switching regulator operation without adjustment, requiring
only six external support components, and an optional capacitor
for soft start operation and an optional transistor for on/off
control. The SI-8008TM includes overcurrent and overheating
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 with Typical Application
VIN 1 IN
SI -8008TM
SW 2
L
C1 PReg
5 SS ON/
OFF
Soft
C3 Start
Overcurrent
Protection
Reset
Oscillator
Latch
&
Driver
Di
R1
Comparator
Thermal ADJ
Protection
4
Error Amp
R2
GND
3
Reference
Voltage
VO
C2
Component
C1
C2
C3
Di
L1
Rating
220 μF
470 μF
1 μF (for soft start function)
SJPB-H6 (Sanken)
47 μH
Figure 1. Application implementing soft start, without implementation of on/off control.
27469.054
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
1 page  
SI-8008TM
DC-to-DC Step-Down Converter
SI-8008TM Thermal Performance Characteristics
Thermal Protection: Output Voltage
versus Junction Temperature
VIN = 8 V, IO = 0.01 A
Junction temperature, TJ, can be calculated as:
TJ = PD × RθJC + TC
where RθJC = 6°C/W, and TC is the temperature
taken by a thermocouple mounted adjacent
to the case on the tab at the location indicated:
Thermocouple mount
at tab center
Power Dissipation
versus Ambient Temperature
TJ(max) = 125°C
Mounted on glass-epoxy PCB (30 mm × 30 mm),
with varying exposed copper areas
PD
= VO
⋅
I
O
⎜⎜⎝⎛
100
Hx
−
1⎟⎟⎠⎞
−
VF
⋅
I
O
⎜⎜⎝⎛1
−
VO
VIN
⎟⎟⎠⎞
where:
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 curve for value), and
VF is forward voltage for the input diode, Di. In these tests,
the Sanken SJPB-H6 was used, at 0.5 V and IO = 1.5 A.
For application design, obtain thermal data from the
datasheet for the diode.
Device Thermal Resistance versus
Exposed Copper Area on PCB
Glass-epoxy PCB, 30 mm2
Device Power Dissipation versus
Exposed Copper Area on PCB
Glass-epoxy PCB, 30 mm2
6
TSD On
5
4
3
2
1
TSD Off
0
0 20 40 60 80 100 120 140 160 180
TJ (°C)
2.0
Cu Area: 625 mm2
1.8 RθJA = 58.9°C/W
Cu Area: 450 mm2
1.6 RθJA = 60.4°C/W
1.4
1.2
1.0
Cu Area: 90 mm2
0.8 RθJA = 80.3°C/W
Cu Area: 39 mm2
0.6 RθJA = 93.7°C/W
Cu Area: 270 mm2
RθJA = 65.1°C/W
Cu Area: 180 mm2
RθJA = 71.4°C/W
0.4
0.2
0
–25
100
90
80
70
60
50
40
10
1.5
1.0
0.5
0
10
0 25 50 75 100 125
TA (°C)
100
Copper Area (mm2)
TA
100
Copper Area (mm2)
1000
25°C
40°C
60°C
85°C
1000
27469.054
SANKEN ELECTRIC CO., LTD.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SI-8008TM.PDF ] | |
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