Datasheet Linear Technology LTC3729L-6 — Даташит

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Application Notes

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  PCB Layout Considerations for Non-Isolated Switching Power Supplies &mdash AN136
  PDF, 215 Кб, Файл опубликован: 20 сен 2012
  The best news when you power up a prototype supply board for the very first time is when it not only works, but also runs quiet and cool. Unfortunately, this does not always happen. A common problem of switching power supplies is “unstable” switching waveforms. Sometimes, waveform jittering is so pronounced that audible noise can be heard from the magnetic components. If the problem is related to the printed circuit board (PCB) layout, identifying the cause can be difficult. This is why proper PCB layout at the early stage of a switching supply design is very critical. Its importance cannot be overstated.
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  Application Note 136
  June 2012
  PCB Layout Considerations for Non-Isolated Switching
  Power Supplies
  Henry J. Zhang
  Introduction
  The best news when you power up a prototype supply board
  for the very first time is when it not only works, but also
  runs quiet and cool. Unfortunately, this does not always
  happen. A common problem of switching power supplies
  is “unstable” switching waveforms. Sometimes, waveform
  jittering is so pronounced that audible noise can be heard
  from the magnetic components. If the problem is related
  to the printed circuit board (PCB) layout, identifying the
  cause can be difficult. This is why proper PCB layout at
  the early stage of a switching supply design is very critical.
  Its importance cannot be overstated.
  The power supply designer is the person who best understands the technical details and functional requirements of
  the supply within the final product. He or she should work
  closely with the PCB layout designer on the critical supply
  layout from the beginning. A good layout design optimizes
  supply efficiency, alleviates thermal stress, and most importantly, minimizes the noise and interactions among traces
  and components. To achieve these, it is important for the …

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• Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers