Datasheet Linear Technology LT8300

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Design Notes

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  Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V &mdash DN509
  PDF, 723 Kb, File published: Oct 24, 2012
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  Micropower Isolated Flyback Converter with Input Voltage
  Range from 6V to 100V
  Design Note 509
  Zhongming Ye
  Introduction
  Flyback converters are widely used in isolated DC/DC
  applications because of their relative simplicity and
  low cost compared to alternative isolated topologies. Even so, designing a traditional flyback is not
  easy—the transformer requires careful design, and
  loop compensation is complicated by the well known
  right-half plane (RHP) zero and the propagation delay
  of the opto-coupler.
  Linear Technology’s no-opto flyback converters, such
  as the LT В® 3573, LT3574, LT3575, LT3511 and LT3512,
  simplify the design of flyback converters by incorporating a primary-side sensing scheme and running the
  converter in boundary mode. The LT8300 high voltage
  monolithic isolated flyback converter further simplifies
  flyback design by integrating a 260mA, 150V DMOS
  power switch, an internal compensation network and a
  soft-start capacitor. The LT8300 operates with input supply voltages from 6V to 100V and delivers output power
  of up to 2W with as few as five external components.
  The LT8300 operates in boundary mode and offers low
  ripple Burst ModeВ® operation, enabling the design of …

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  Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution &mdash DN525
  PDF, 259 Kb, File published: Feb 10, 2014
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  Monolithic No-Opto Isolated Flyback Converter Provides
  Versatile Solution
  Design Note 525
  George Qian
  Introduction
  Traditionally, isolated power supplies use an optocoupler in the feedback loop to transfer regulation
  information across the isolation barrier. Unfortunately,
  an opto-coupler’s gain characteristic varies widely over
  temperature and lifetime, increasing the difficulty of
  power supply loop compensation.
  Linear Technology’s line of no-opto flyback converters,
  such as the LTВ®3573, LT3574, LT3575, LT3511, LT3512
  and LT8300, simplify flyback design by incorporating
  a primary-side sensing scheme, thereby eliminating
  the need for an opto-isolator.
  The LT8302 monolithic no-opto flyback converter
  has an integrated 65V/3.6A DMOS power switch with
  internal loop compensation and soft-start. The LT8302
  can operate from an input voltage as low as 2.8V to
  42V, and deliver output power up to 18W. It offers
  low ripple Burst Mode В® operation at light loads, providing low standby power loss, and features a low
  component count.
  Performance and Ease of Use …

Articles

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  100V Micropower No-Opto Isolated Flyback Converter in 5-Lead TSOT-23 &mdash LT Journal
  PDF, 3.2 Mb, File published: Oct 18, 2012
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  design features 100V Micropower No-Opto Isolated Flyback Converter in
  5-Lead TSOT-23
  Min Chen The non-synchronous flyback topology is widely used
  in isolated power supplies ranging from sub-watt power
  levels to tens of watts. Linear’s no-opto isolated flyback
  family dramatically simplifies isolated power supply design
  with proprietary primary-side sensing, which requires
  no opto-coupler or transformer third winding for output
  regulation. The new LT8300, the first micropower part in
  this family, significantly improves light load efficiency and
  reduces no-load input standby current to about 200ВµA.
  The LT8300 operates from an input
  voltage range of 6V to 100V and delivers up to 2W of isolated output power.
  The 150V integrated DMOS power switch
  eliminates the need for a snubber in most
  applications. By sampling the isolated
  output voltage directly from the primaryside flyback waveform, the LT8300 requires
  no opto-coupler or transformer third
  winding for regulation. The output voltage is set with a single external resistor. Internal loop compensation and soft start
  further reduce external component count.
  Boundary mode operation at heavy load
  enables the use of small magnetics and
  produces excellent load regulation. Low …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators