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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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  Dual, Fast, Step-Down Controller's External Reference Input Enables Dynamic Voltage Scaling from 0.4V to 5.5V and 0.3% Total Combined Regulation Accuracy &mdash LT Journal
  PDF, 2.8 Mb, File published: Apr 10, 2013
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  design features Dual, Fast, Step-Down Controller’s External Reference Input
  Enables Dynamic Voltage Scaling from 0.4V to 5.5V and
  0.3% Total Combined Regulation Accuracy
  Shuo Chen and Terry Groom Low voltage, high current
  systems require accurate
  differential regulation. It is
  not uncommon for power
  supply rails at or below
  0.9V to demand 25A or
  more, with fast transients
  that look like intermittent
  electrical shorts to the
  power supply rail. Such
  systems typically require
  power supply regulation
  accuracy of less than 1%
  regulated DC and 3% in the
  face of input transients.
  Increasingly, core processors and other
  large scale digital ICs (such as ASICs and
  FPGAs) require dynamic voltage scaling—either multiple fixed levels, or a
  continuously adjusted reference voltage
  using a servo loop—to deliver power …

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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:

LTC3838EUHF-2PBF, LTC3838EUHF-2 PBF, LTC3838EUHF2#PBF, LTC3838EUHF 2#PBF