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NJW4160 Datasheet(PDF) 14 Page - New Japan Radio

Part No. NJW4160
Description  Switching Regulator IC for Buck Converter
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.njr.co.jp/index_e.htm
Logo NJRC - New Japan Radio

NJW4160 Datasheet(HTML) 14 Page - New Japan Radio

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NJW4160
- 14 -
Ver.2014-04-01
Application Information (Continued)
Input Capacitor
Transient current flows into the input section of a switching regulator responsive to frequency. If the power supply
impedance provided to the power supply circuit is large, it will not be possible to take advantage of the NJW4160
performance due to input voltage fluctuation. Therefore insert an input capacitor as close to the MOSFET as
possible.
Output Capacitor
An output capacitor stores power from the inductor, and stabilizes voltage provided to the output.
When selecting an output capacitor, you must consider Equivalent Series Resistance (ESR) characteristics, ripple
current, and breakdown voltage.
Also, the ambient temperature affects capacitors, decreasing capacitance and increasing ESR (at low
temperature), and decreasing lifetime (at high temperature). Concerning capacitor rating, it is advisable to allow
sufficient margin.
Output capacitor ESR characteristics have a major influence on output ripple noise. A capacitor with low ESR can
further reduce ripple voltage. Be sure to note the following points; when ceramic capacitor is used, the capacitance
value decreases with DC voltage applied to the capacitor.
NJW4160 Application Manual
Technical Information


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