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Application Notes

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  Modeling and Loop Compensation Design of Switching Mode Power Supplies &mdash AN149
  PDF, 1.4 Mb, File published: Mar 23, 2015
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  Application Note 149
  January 2015
  Modeling and Loop Compensation Design of
  Switching Mode Power Supplies
  Henry J. Zhang
  Introduction Identifying The Problem Today’s electronic systems are becoming more and more
  complex, with an increasing number of power rails and
  supplies. To achieve optimum power solution density,
  reliability and cost, often system designers need to design
  their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
  performance switching mode power supplies is becoming
  a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
  must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
  Typical symptoms of an unstable power supply include:
  audible noise from the magnetic components or ceramic
  capacitors, jittering in the switching waveforms, oscillation
  of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
  viewed as a difficult task, especially for inexperienced
  supply designers. Practical compensation design typically
  involves numerous iterations on the value adjustment
  of the compensation components. This is not only time
  consuming, but is also inaccurate in a complicated
  system whose supply bandwidth and stability margin …

Articles

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  Sub-Milliohm DCR Current Sensing with Accurate Multiphase Current Sharing for High Current Power Supplies &mdash LT Journal
  PDF, 2.7 Mb, File published: Jan 17, 2013
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  Sub-Milliohm DCR Current Sensing with
  Accurate Multiphase Current Sharing for
  High Current Power Supplies
  Muthu Subramanian, Tuan Nguyen and Theo Phillips The increasing functional complexity of electronic devices, combined with the desire for
  higher microprocessor computational speed and the quest for eco-friendly electronics,
  places stringent requirements on power supplies. High current supplies are expected
  to operate at top efficiency. In order to minimize conduction losses, power supplies
  are placed closer to the load, and multiple power stages are used on the same board.
  Individual power stages have had to shrink in size to fit the available board area. To
  achieve the best performance per board area, controllers must work with external
  power stages such as power blocks, DrMOS or external gate drivers with MOSFETs.
  SS
  VIN
  7V TO 14V 20k 4.22k 40.2k VOUT LTC3861 VSNSOUT1
  COMP2
  FB2 SS CLKIN
  500kHz EXTERNAL
  SYNC INPUT 1О©
  2.2ВµF
  16V 53.6k RUN1
  ILIM1
  SGND
  ISNS1P …

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Manufacturer's Classification

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

Other Names:

LTC3861IUHETRPBF, LTC3861IUHE TRPBF