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Design Notes

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  60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI &mdash DN567
  PDF, 474 Kb, File published: Aug 24, 2017
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  60V 2MHz Buck-Boost Controllers Regulate High Power
  Voltage and Current with High Efficiency and Low EMI
  Design Note 567
  Keith Szolusha
  Synchronous buck-boost controllers are versatile and
  highly efficient. They can produce high power as both a
  boost and a buck with a single inductor, keeping power
  supply design simple. Normally, a buck-boost controller
  in a high power application is operated at a standard
  or low switching frequency, this maximizes efficiency
  and avoids complications related to shoot-through and
  switch blanking time, which can arise in synchronous
  rectification at high frequencies. Nevertheless, a high
  frequency 2MHz buck-boost controller with a smaller
  inductor ensures that the EMI content resides above
  the AM frequency band. currents, such as 10A. Such high peak currents would
  burn up the small IC packages of typical integrated
  converters, but external 3mm Г— 3mm synchronous
  MOSFETs can handle this power. The MOSFETs can be
  arranged in tight quarters with hot-loop capacitors for
  very low EMI. The unique peak switch current sense
  amplifier architecture places the sense resistor next to
  the power inductor, outside the critical input and output …

Articles

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  Single 2MHz Buck-Boost Controller Drives Entire LED Headlight Cluster, Meets CISPR 25 Class 5 EMI &mdash LT Journal
  PDF, 2.6 Mb, File published: Jan 3, 2018
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  design features Single 2MHz Buck-Boost Controller Drives Entire LED
  Headlight Cluster, Meets CISPR 25 Class 5 EMI
  Keith Szolusha Automobile LED headlight clusters combine high and low beams, daytime running
  lights, and sometimes signal and clearance lights into a single headlight cluster. The
  components of the cluster can have vastly different driver requirements, including
  voltage and current requirements, topologies, power levels or unique dimming functions.
  Meeting the range of requirements usually means employing separate driver solutions.
  Using multiple drivers not only complicates BOMs and production; it can make it
  difficult to meet EMI standards. Each additional driver adds its high frequency signals
  to the EMI mix, complicating EMI qualification, troubleshooting and mitigation.
  Although the headlight cluster for each
  automobile make and model may be
  outfitted with a creative variety of LED
  currents and voltages, they commonly
  top out at 30W total. With that in mind,
  there should be a number of drivers that
  satisfy the power and feature requirements of every string in the cluster. There
  are not. Such a driver needs to take the
  relatively wide battery voltage range, and
  using a buck-boost topology, convert
  to the wide variety of string voltages.
  It needs to be small and versatile, to
  fit easily into the space constraints of …

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Manufacturer's Classification

• Power Management > LED Driver ICs > Buck-Boost LED Drivers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) LED Drivers

Other Names:

LT8391AEFEPBF, LT8391AEFE PBF