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ML0308AMRG bảng dữ liệu(PDF) 6 Page - Minilogic Device Corporation Limited

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nhà sản xuất  MINILOGIC [Minilogic Device Corporation Limited]
Trang chủ  http://www.minilogic.com.hk
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ML0308 Preliminary
______________________________________________________________________________________________________
6/9
Rev. B, July 2005
Best results will be obtained when IPEAK is kept
below 300mA.
Capacitor Selection
Low
ESR
(Equivalent
Series
Resistance)
capacitors should be used at the output to
minimize the output ripple voltage. Multilayer
ceramic capacitors are the best choice, as they
have a very low ESR and are available in very
small packages. Their small size makes them a
good companion to the ML0308 SOT23 package.
Solid tantalum capacitors can be used, but they
will occupy more board area than a ceramic and
will have a higher ESR. Always use a capacitor
with
a
sufficient
voltage
rating.
Ceramic
capacitors also make a good choice for the input
decoupling capacitor, which should be placed as
close as possible to the ML0308. A 4.7uF input
capacitor is sufficient for most applications.
Diode Selection
For most ML0308 applications, the Motorola
MBR0520 surface mount Schottky diode (0.5A,
20V) is an ideal choice. Schottky diodes, with
their low forward voltage drop and fast switching
speed, are the best match for the ML0308. Many
different manufacturers make equivalent parts, but
make sure that the component is rated to handle at
least 0.35A.
Lowering Output Voltage Ripple
Using low ESR capacitors will help minimize the
output ripple voltage, but proper selection of the
inductor and the output capacitor also plays a big
role. The ML0308 provides energy to the load in
bursts by ramping up the inductor current, then
delivering that current to the load. If too large of
an inductor value or too small of a capacitor value
is used, the output ripple voltage will increase
because the capacitor will be slightly overcharged
each burst cycle. To reduce the output ripple,
increase the output capacitor value or add a 4.7pF
feed-forward capacitor in the feedback network of
the ML0308 (see the circuits in the Typical
Applications
section).
Adding
this
small,
inexpensive 4.7pF capacitor will greatly reduce
the output voltage ripple.


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