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LM1938SF6 データシート(Datasheet) 6 Page - HTC Korea TAEJIN Technology Co.

部品番号. LM1938SF6
部品情報  White LED Step-Up Converternull
ダウンロード  6 Pages
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メーカー  HTC [HTC Korea TAEJIN Technology Co.]
ホームページ  http://www.htckorea.co.kr
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 6 page
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White LED Step-Up Converter
LM1938
Aug. 2011 – Pre
- 6
-
HTC
APPLICATION INFORMATION
Inductor Selection
A 10uH inductor is recommended for most LM1938 applications. Although small size and high efficiency
are major concerns, the inductor should have low core losses at 1.2MHz and low DCR (copper wire
resistance).
Capacitor Selection
The small size of ceramic capacitors makes them ideal for LM1938 applications. X5R and X7R types are
recommended because they retain their capacitance over wider voltage and temperature ranges than
other types such as Y5V or Z5U. A 4,7uF input capacitor and a 4,7uF output capacitor are sufficient for
most LM1938 applications.
Diode Selection
Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for
LM1938 applications. The forward voltage drop of a Schottky diode represents the conduction losses in
the diode, while the diode capacitance represents the switching losses. For diode selection, both forward
voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings
usually have lower forward voltage drop and larger diode capacitance, which can cause significant
switching losses at the 1.2MHz switching frequency of the LM1938. A Schottky diode rated at 1000mA is
sufficient for most LM1938 applications.




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