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SI-8033T 数据表(PDF) 9 Page - Sanken electric

部件名 SI-8033T
功能描述  DC/DC Step-Down Converter IC
Download  15 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-8033T 数据表(HTML) 9 Page - Sanken electric

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DC/DC Step-Down Converter IC
SI-8000TM Series
September 2005
Sanken Electric Co.,Ltd.
I02-001EA-050910
6-1 Standard circuit diagram
VIN
1
GND
GN
D
2
4
5
3
GND
SS
IN
SW
ADJ
C1
220uF
C2
470uF
L 47uH
Di
VO
SI-8008TM
R1
R2
IADJ
C3
Diode Di
The shottky-barrier diode must be used for Di. If other diodes like fast recovery diodes are used, 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 go down to the extent that
it is out of the rating.
As the overcurrent protection start current is approx. 2.5A, attention must be paid to the heating of
the choke coil by the magnetic saturation due to overload or short-circulated load.
Capacitor C1,C2,C3
As large ripple currents flow across C1 and C2, capacitors with high frequency and low impedance
for SMPS must be used. Especially when the impedance of C2 is high, the switching waveform may
not be normal at low temperature. Please use neither OS capacitor nor tantalum capacitor which
causes an abnormal oscillation for the C2.
C3 is a capacitor for soft start. In case soft start function is not used, please keep No.5 terminal open.
A pull-up resistor is provided inside the IC.
Resister R1,R2
R1,R2 is resistor to the Output Voltage. IADJ set to become 1mA. Moreover, R1,R2 is calculated
by the following expression.
In order to have optimum operating condition, each component must be laid out with the minimum
distance.
C1:220μF
C2:470μF
C3:1μF
(If soft start function is used)
L1:47μH
Di:SFPB66
(Made by Sanken)
(
) ()()
()
Ω
×
=
=
Ω
×
=
=
k
I
V
R
V
I
V
V
R
ADJ
ADJ
OUT
ADJ
ADJ
OUT
8
.
0
10
1
8
.
0
2
10
1
8
.
0
1
3
3
9/15


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