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Notas de aplicación

• Descargar
  LTM4601 DC/DC uModule Thermal Performance &mdash AN110
  PDF, 193 Kb, Archivo publicado: mayo 10, 2007
  This application note provides an extensive guideline for the thermal performance of the LTM4601 μModule. The LTM4601 is characterized with and without heatsinking over an extended operating temperature range. De-rating curves are derived with the different heatsinking types, and the equivalent θJA (thermal resistance) is derived. The different θJA parameters are tabulated with reference to the different test conditions.
  Extracto del documento

  Application Note 110
  May 2007
  LTM4601 DC/DC ВµModuleВ® Regulator Thermal
  Performance
  Eddie Beville, Jian Yin
  INTRODUCTION
  The LTM4601 DC/DC ОјModule regulator is a complete
  high power density stepdown regulator for up to 12A
  continuous (14A peak) loads. The device is housed in
  a small 15mm ВҐ 15mm ВҐ 2.8mm LGA surface mount
  package, thus the large power dissipation is a challenge
  in some applications. This thermal application note will
  provide guidelines for using the ОјModule regulator in
  ambient environments with or without air flow. Load
  current derating curves are provided for several input
  voltages and output voltages versus ambient temperature
  and air flow. These derating curves provide guidelines
  for using the LTM4601 in ambient environments with
  regard to safe-operating-area (SOA). Also included are
  efficiency curves that are used to extrapolate the power
  loss curves used in this thermal application note. The approach is to measure the temperature of a design, derive
  thermal models for different cases and п¬Ѓnally determine
  the junction-to-ambient thermal resistance (qJA) in units of …

• Descargar
  Powering Complex FPGA-Based Systems Using Highly Integrated DC/DC uModule Regulator Systems &mdash AN119A
  PDF, 512 Kb, Archivo publicado: abr 30, 2008
  In a recent discussion with a system designer, the re- quirement for his power supply was to regulate 1.5V and deliver up to 40A of current to a load that consisted of four FPGAs. This is up to 60W of power that must be delivered in a small area with the lowest profile (height) possible to allow a steady flow of air for cooling. The power supply had to be surface mountable and operate at high enough efficiency to minimize heat dissipation. He also demanded the simplest possible solution so his time could be dedicated to the more complex tasks. Aside from precise electrical performance, this solution had to remove the heat generated during DC to DC conversion quickly so that the circuit and the ICs in the vicinity do not over heat.
  Extracto del documento

  Application Note 119A
  April 2008
  Powering Complex FPGA-Based Systems Using Highly
  Integrated DC/DC ВµModule Regulator Systems
  Part 1 of 2 Circuit and Electrical Performance
  Alan Chern and Afshin Odabaee
  In a recent discussion with a system designer, the requirement for his power supply was to regulate 1.5V
  and deliver up to 40A of current to a load that consisted
  of four FPGAs. This is up to 60W of power that must be
  delivered in a small area with the lowest height profile
  possible to allow a steady flow of air for cooling. The
  power supply had to be surface mountable and operate
  at high enough efficiency to minimize heat dissipation.
  He also demanded the simplest possible solution so his
  time could be dedicated to the more complex tasks. Aside
  from precise electrical performance, this solution had to
  remove the heat generated during DC to DC conversion
  quickly so that the circuit and the ICs in the vicinity do not
  overheat. Such a solution requires an innovative design
  to meet these criteria: contribute to lower system cost, consuming less power
  to remove heat). Figure 1 shows a test board for such a
  circuit. The design regulates 1.5V output while delivering
  40A (up to 48A) of load current. Each “black square” is a …

• Descargar
  Powering Complex FPGA-Based Systems Using Highly Integrated DC/DC uModule Regulator Systems &mdash AN119B
  PDF, 290 Kb, Archivo publicado: abr 30, 2008
  In part one of this article, we discussed the circuit and electrical performance of a compact and low proп¬Ѓle 48A, 1.5V DC/DC regulator solution for a four-FPGA design. The new approach uses four DC/DC μModule™ regulators in parallel (Figure 1) to increase output current while sharing the current equally among each device. This solution relies on the accurate current sharing of these μModule regulators to prevent hot-spots by dissipating the heat evenly over a compact surface area. Each DC/DC μModule is a complete power supply with on-board inductor, DC/DC controller, MOSFETs, compensation circuitry and input/output bypass capacitors. It occupies only 15mm × 15mm of board area and has a low proп¬Ѓle (height) of only 2.8mm. This low proп¬Ѓle allows air to flow smoothly over the entire circuit. Moreover, this solution casts no thermal shadow on its surrounding components, further assisting in optimizing thermal performance of the entire system.
  Extracto del documento

  Application Note 119B
  April 2008
  Powering Complex FPGA-Based Systems Using Highly
  Integrated DC/DC ВµModule Regulator Systems
  Part 2 of 2 Thermal Performance and Layout
  Alan Chern and Afshin Odabaee
  60W by Paralleling Four DC/DC ОјModule Regulators Thermal Performance In part one of this article, we discussed the circuit and
  electrical performance of a compact and low profile 48A,
  1.5V DC/DC regulator solution for a four-FPGA design. The
  new approach uses four DC/DC ОјModuleВ® regulators in
  parallel (Figure 1) to increase output current while sharing the current equally among each device. This solution
  relies on the accurate current sharing of these ОјModule
  regulators to prevent hot-spots by dissipating the heat
  evenly over a compact surface area. Each DC/DC ОјModule
  regulator is a complete power supply with on-board inductor,
  DC/DC controller, MOSFETs, compensation circuitry and
  input/output bypass capacitors. It occupies only 15mm Г—
  15mm of board area and has a low profile (height) of only
  2.8mm. This low profile allows air to flow smoothly over
  the entire circuit. Moreover, this solution casts no thermal
  shadow on its surrounding components, further assisting
  in optimizing thermal performance of the entire system. Figure 2 is a thermal image of the board shown in Figure 1
  with readings of the temperatures at speciп¬Ѓc locations. …

Notas de Diseño

• Descargar
  Simple and Compact 4-Output Point-of-Load DC/DC uModule System &mdash DN411
  PDF, 705 Kb, Archivo publicado: marzo 21, 2007
  Extracto del documento

  Simple and Compact 4-Output Point-of-Load DC/DC ВµModule
  System – Design Note 411
  Jian Yin and Eddie Beville
  Introduction
  Advancements in board assembly, PCB layout and
  digital IC integration have produced a new generation
  of densely populated, high performance systems. The
  board-mounted, point-of-load (POL) DC/DC power supplies in these systems are subject to the same demanding size, performance and power requirements as other
  subsystems—demands that are difficult to meet with
  traditional power modules or controller/regulator ICs.
  The LTM4601 DC/DC ВµModuleTM converter meets these
  demands by shrinking an entire solution to the size of a
  low profile IC. Its frequency synchronization and voltage
  tracking features allow multiple LTM4601s to be easily
  and quickly configured for multioutput applications.
  4-Output DC/DC Converter Power System
  Figure 1 shows the photo of a 4-output DC/DC supply
  using four ВµModule converters with frequency synchronization and output tracking. The operating waveforms of
  the four outputs are interleaved with a 90В° relative phase
  difference, thus reducing the effective input current ripple. This in turn significantly reduces the bulk capacitance of
  the circuit and the circuit size.
  Figure 2 presents the efficiency of each output in Figure 1.
  With 12V input voltage, each output is tested up to 12A …

Artículos

• Descargar
  Easy High Density Power: 48A Surface Mount DC/DC Power Supply Uses Four Parallel 12A uModule Regulators &mdash LT Journal
  PDF, 1.1 Mb, Archivo publicado: enero 14, 2008
  Extracto del documento

  LINEAR TECHNOLOGY January 2008 IN THIS ISSUE…
  Cover Article
  Easy High Density Power: 48A Surface
  Mount DC/DC Power Supply Uses Four
  Parallel 12A ВµModule Regulators.1
  Alan Chern Linear in the News….2
  Design Features
  Internal 2A, 42V Switch, Adjustable
  2.5MHz Operating Frequency and
  3mm Г— 3mm Package Allow Boost
  Regulator to Fit Numerous Applications
  .7
  Mathew Wich 36V, 3.5A DC/DC Buck Regulators
  for Automotive, Industrial and Wall
  Adapter Applications Offer High
  Efficiency in a Small Package .11
  Kevin Huang Monolithic 2A Buck Regulator
  Plus Linear Regulator Simplifies
  Wide Input Voltage Applications.13
  Rich Philpott Efficient 48V Buck Mode
  LED Driver Delivers 50mA.16
  Mohammad J. Navabi Synchronous Boost Converters Provide
  High Voltage without the Heat.19 …

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• µModule Solutions > µModule Regulators > µModule Buck Regulators