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SS6639 Datasheet(PDF) 11 Page - Silicon Standard Corp.

Part # SS6639
Description  1-Cell, 3-Pin, Step-Up DC/DC Controller
PDF  12 Pages
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Manufacturer  SSC [Silicon Standard Corp.]
Direct Link  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6639 Datasheet(HTML) 11 Page - Silicon Standard Corp.

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SS6639
diode such as the 1N5819. Motorola makes the
MBR0530 for surface mount. For lower output power a
1N4148 can be used although efficiency and start-up
voltage will suffer substantially.
COMPONENT POWER DISSIPATION
Operating in discontinuous mode, the power loss in
the winding resistance of the inductor is approximately
equal to
( )
(
)
OUT
OUT
D
OUT
S
ON
L
P
V
V
V
R
L
T
PD
*
*
*
*
3
2
+
=
where POUT=VOUT * IOUT ; RS=Inductor DC R;
VD = Diode drop.
The power dissipated in switching losses is
( ) (
)
)
(
*
*
*
*
3
2
OUT
OUT
ON
ON
P
I
R
L
T
PDsw
=
The power dissipated in the rectifier diode is
(
)
OUT
OUT
D
D
P
V
V
PD
*
=
Rev.2.01 6/26/2003



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