Datasheet Linear Technology LT3573

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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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  Primary-Side Sensing Takes Complexity out of Isolated Flyback Converter Design &mdash LT Journal
  PDF, 206 Kb, File published: Jan 1, 2009
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  L DESIGN IDEAS Primary-Side Sensing Takes
  Complexity out of Isolated
  Flyback Converter Design
  Introduction
  Flyback converters are widely used
  in isolated DC/DC applications, but
  they are not necessarily a designer’s
  first choice. Power supply designers grudgingly choose a flyback out
  of necessity for electronic isolation;
  certainly not because they are an
  easy to design. A flyback converter
  requires that significant design time
  be devoted to transformer design, a
  task further complicated by limited
  off-the-shelf transformer selection and
  the necessity for customized magnetics. Moreover, the flyback converter
  has stability issues due to the wellknown right-half-plane (RHP) zero
  in the control loop, which is further
  complicated by the propagation delay
  of an optocoupler.
  The LT3573 isolated monolithic
  flyback converter solves many of the
  design difficulties commonly associDESIGN IDEAS …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers