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  Easily Boost 12V to 140V with a Single Converter IC &mdash DN1033
  PDF, 328 Kb, Archivo publicado: sept 28, 2015
  Extracto del documento

  Easily Boost 12V to 140V with a Single Converter IC
  Design Note 1033
  Victor Khasiev
  INTRODUCTION
  Generating a high voltage from a much lower
  voltage presents a number of challenges for the
  classical single stage boost topology. For instance,
  the maximum duty cycle limitation of a boost controller may not allow the required step-up ratio.
  Even if it does, there is often a sharp decrease in
  efficiency at high duty cycles. The duty cycle can
  be shortened by choosing discontinuous mode of
  operation, but this leads to high peak input current,
  higher losses and EMI challenges.
  An alternative to a single boost converter is a 2-stage
  boost converter, where the first stage produces
  anВ intermediate voltage and the second stage boosts
  to the final high voltage. A 2-stage converter can be
  produced with a single controller IC, such as the
  LTC В®3788, a high performance 2-phase dual output synchronous boost controller, which drives all
  N‑channel power MOSFETs. power losses and eases thermal requirements. The
  maximum output voltage of this controller is 60V, when
  using synchronous rectification. If greater thanВ 60V
  is required, the second stage can be designed to run …

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  2-Phase, Dual Output Synchronous Boost Converter Solves Thermal Problems in Harsh Environments &mdash DN481
  PDF, 78 Kb, Archivo publicado: jun 30, 2010
  Extracto del documento

  2-Phase, Dual Output Synchronous Boost Converter Solves
  Thermal Problems in Harsh Environments – Design Note 481
  Goran Perica
  Introduction
  Boost converters are regularly used in automotive and
  industrial applications to produce higher output voltages
  from lower input voltages. A simple boost converter using a Schottky boost diode (Figure 1) is often sufficient
  for low current applications. However, in high current or
  space-constrained applications, the power dissipated
  by the boost diode can be a problem especially in high
  ambient temperature environments. Heat sinks and fans
  may be needed to keep the circuit cool, resulting in high
  cost and complexity.
  To solve this problem, the Schottky output rectifier can be
  replaced by a synchronous MOSFET rectifier (Figure 2).
  If MOSFETs with very low RDS(ON) are used, the power
  dissipation can be reduced to the point where no heat
  sinks or active cooling is required, thus reducing costs
  and saving space.
  Advantages of Synchronous Rectification
  Consider the power dissipation of the single output circuit
  in Figure 1. The output diode D1 carries 6.7A of RMS
  current to produce 3A of output current from a 5V input. …

Artículos

• Descargar
  Boost 12V to 140V with a Single Converter IC &mdash LT Journal
  PDF, 152 Kb, Archivo publicado: nov 2, 2015
  Extracto del documento

  Boost 12V to 140V with a Single Converter IC
  Victor Khasiev Generating a high voltage from a much lower voltage
  presents a number of challenges for the classical single
  stage boost topology. For instance, the maximum
  duty cycle limitation of a boost controller may not
  allow the required step-up ratio. Even if it does, there
  is often a sharp decrease in efficiency at high duty
  cycles. The duty cycle can be shortened by choosing
  discontinuous mode of operation, but this leads to high
  peak input current, higher losses and EMI challenges.
  An alternative to a single boost converter
  is a 2-stage boost converter, where the
  first stage produces anВ intermediate
  voltage and the second stage boosts
  to the final high voltage. A 2-stage
  converter can be produced with a single
  controller IC, such as the LTC3788, a high performance 2-phase dual output
  synchronous boost controller, which
  drives all N‑channel power MOSFETs.
  The LTC3788 can be configured such that
  the first boost stage takes advantage of its
  synchronous rectification feature, which
  maximizes efficiency, reduces power losses FigureВ 1. Block diagram of LTC3788-based 2-stage boost converter CINT 40V ABS MAX TG1 SW1 PGOOD1 ILIM SS1 ITH1 FB1 SENSE1+ Q1 …

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• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Multiple Output Boost | External Power Switch Boost