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ILC6391 Datasheet(PDF) 6 Page - Fairchild Semiconductor

No. de pieza ILC6391
Descripción Electrónicos  SOT-89 Step-Up PFM Switcher with Auto-Load Sense
Download  10 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ILC6391 Datasheet(HTML) 6 Page - Fairchild Semiconductor

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ILC6390/91
6
©2001 Fairchild Semiconductor Corporation
External Components and
Layout Consideration
The ILC6390 is designed to provide a complete DC-DC con-
verter solution with a minimum of external components. Ide-
ally, only three externals are required: the inductor, a pass
diode, and an output capacitor.
The inductor needs to be of low DC Resistance type, typi-
cally 1
Ω value. Toroidal wound inductors have better field
containment (less high frequency noise radiated out) but tend
to be more expensive. Some manufacturers like Coilcraft
have new bobbin-wound inductors with shielding included,
which may be an ideal fit for these applications. Contact the
manufacturer for more information.
The inductor size needs to be in the range of 47mH to 1mH.
In general, larger inductor sizes deliver less current, so the
load current will determine the inductor size used.
For load currents higher than 10mA, use an inductor from
47mH to 100mH. [The 100mH inductor shown in the
datasheet is the most typical used for this application.]
For load currents of around 5mA, such as pagers, use an
inductor in the range of 100mH to 330mH. 220mH is the
most typical value used here.
For lighter loads, an inductor of up to 1mH can be used. The
use of a larger inductor will increase overall conversion effi-
ciency, due to the reduction in switching currents through the
device.
For the ILC6391, using an external transistor, the use of a
47mH inductor is recommended based on our experience
with the part.
The capacitor should, in general, always be tantalum type, as
tantalum has much better ESR and temperature stability than
other capacitor types. NEVER use electrolytics or chemical
caps, as the C-value changes below 0×C so much as to make
the overall design unstable.
Different C-values will directly impact the ripple seen on the
output at a given load current, due to the direct charge-to-
voltage relationship of this element. Different C-values will
also indirectly affect system reliability, as the lifetime of the
capacitor can be degraded by constant high current influx
and outflux. Running a capacitor near its maximum rated
voltage can deteriorate lifetime as well; this is especially true
for tantalum caps which are particularly sensitive to over-
voltage conditions.
In general, then, this capacitor should always be 47mF, Tan-
talum, 16V rating.
The diode must be of shottkey type for fast recovery and
minimal loss. A diode rated at greater than 200mA and max-
imum voltage greater than 30V is recommended for the fast-
est switching time and best reliability over time. Different
diodes may introduce different levels of high frequency
switching noise into the output waveform, so trying out sev-
eral sources may make the most sense for your system.
For the IL6391, much of the component selection is as
described above, with the addition of the external NPN tran-
sistor and the base drive network. The transistor needs to be
of NPN type, and should be rated for currents of 2A or more.
[This translates to lower effective on resistance and, there-
fore, higher overall efficiencies.] The base components
should remain at 1k
Ω and 3300pF; any changes need to be
verified prior to implementation.
As for actual physical component layout, in general, the
more compact the layout is, the better the overall perfor-
mance will be. It is important to remember that everything in
the circuit depends on a common and solid ground reference.
Ground bounce can directly affect the output regulation and
presents difficult behavior to predict. Keeping all ground
traces wide will eliminate ground bounce problems.
It is also critical that the ground pin of CL and the VSS pin of
the device be the same point on the board, as this capacitor
serves two functions: that of the output load capacitor, and
that of the input supply bypass capacitor.
Layouts for DC-DC converter designs are critical for overall
performance, but following these simple guidelines can sim-
plify the task by avoiding some of the more common mis-
takes made in these cases. Once actual performance is
completed, though, be sure to double-check the design on
actual manufacturing prototype product to verify that noth-
ing has changed which can affect the performance.


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