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SS6638G Datasheet(PDF) 17 Page - Silicon Standard Corp.

Part # SS6638G
Description  Simple 3-Pin Step-Up DC/DC Converter
PDF  19 Pages
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Manufacturer  SSC [Silicon Standard Corp.]
Direct Link  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6638G Datasheet(HTML) 17 Page - Silicon Standard Corp.

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2
I
L
2
1
EL
PK
×
=
 −
−
+
−
−
−
+
=
2
x
1
T
2L
V
V
I
2
x
V
V
V
V
V
I
ON
SW
IN
OUT
SW
IN
SW
D
OUT
PK
Power required from the inductor per cycle must
be equal or greater than
)
F
1
)(
)(I
VI
V
(V
/F
P
SW
OUT
N
D
OUT
SW
L
−
+
=
Valley current (Iv) is
 −
×
−
−
−
−
−
+
=
2
x
1
T
2L
V
V
I
2
x
V
V
V
V
V
Iv
ON
SW
IN
OUT
SW
IN
SW
D
OUT
in order for the converter to regulate the output.
When loading is over IOB, PFM converter
operates in continuous mode. Inductor peak
current can be derived from
Table 1 Indicates resistance and height for each coil.
Power Inductor Type
Inductance
(
µH )
Resistance
(
Ω )
Rated Current
(A)
Height
(mm)
22
0.10
0.7
47
0.18
0.5
DS1608
100
0.38
0.3
2.9
22
0.08
2.7
Coilcraft SMT Type
(www.coilcraft.com)
DO3316
47
0.14
1.8
5.2
47
0.25
0.7
Sumida SMT Type CD54
100
0.50
0.5
4.5
47
0.25
0.7
Hold
SMT Type PM54
100
0.50
0.5
4.5
Hold
SMT Type PM75
33
0.11
1.2
5.0
CAPACITOR SELECTION
A poor choice for an output capacitor can result in
poor efficiency and high output ripple. Ordinary
aluminum electrolytics, while inexpensive, may
have unacceptably poor ESR and ESL. There are
low ESR aluminum capacitors for switch mode
DC-DC converters which work much better than
general
proposetypes.
Tantalum
capacitors
provide still better performance but are more
expensive. OS-CON capacitors have extremely
low ESR in a small size. If capacitance is
reduced, output ripple will increase.
Most of the input supply is provided by the input
bypass capacitor; the capacitor voltage rating
should be at least 1.25 times greater than the
maximum input voltage.
DIODE SELECTION
Speed, forward drop, and leakage current are the
three main considerations in selecting a rectifier
diode.
Best
performance
is
obtained
with
a Schottky rectifier diode, such as the 1N5818,
or the SS13 and B0530W in surface mount packages.
For lower output power a 1N4148 can be used
although efficiency and start-up voltage will suffer
substantially.
SS6638G
8/21/2005 Rev.2.3



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