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Application Notes

• Download
  Using the LTM2881 as an Isolated 5V Power Supply &mdash AN125
  PDF, 95 Kb, File published: Feb 5, 2010
  The LTM2881 is an isolated RS485 transceiver that guards against large ground-to-ground differentials. An onboard DC/DC converter provides isolated 5V power to the output. This application note shows the LTM2881 configured as a dedicated isolated power supply with the RS485 transceiver disabled, providing a simple powerful general purpose isolated power supply capable of delivering 1W at 5V.
  Extract from the document

  Application Note 125
  February 2010
  Using the LTM2881 as an Isolated 5V Power Supply
  Brian Jadus
  Features: 2500VRMS Isolated 5V 1W Power With No External
  Components n В® The LTM 2881 is an isolated RS485 transceiver that guards
  against large ground-to-ground differentials. An onboard
  DC/DC converter provides isolated 5V power to the output.
  Figure 1 shows the LTM2881 configured as a dedicated
  isolated power supply with the RS485 transceiver disabled,
  providing a simple powerful general purpose isolated power
  supply capable of delivering 1W at 5V. Figure 2 shows a
  logically-controlled switched output by taking advantage of
  the isolated RS485 driver to control a discrete PMOSFET.
  The controlling signal DI operates relative to the VL supply, which supports voltages from 1.62V to 5.5V. In both
  configurations, observation of a VCC2 fault is accomplished
  by observing a high impedance condition on RO or DOUT .
  When VCC2 is greater than 2.6V, RO and DOUT are driven
  to the appropriate logic level based on the inputs A and
  B and DIN. When VCC2 is less than 2.4V, RO and DOUT are
  high impedance. n 5V (LTM2881-5) or 3.3V (LTM2881-3) Input Supply
  Voltage
  5V DC Output Delivers 200mA at 62% Efп¬Ѓciency with …

Articles

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  Isolated Data Transmission and Power Conversion Integrated Into a Surface Mount Package &mdash LT Journal
  PDF, 1.4 Mb, File published: Jan 18, 2011
  Extract from the document

  Isolated Data Transmission and Power Conversion
  Integrated Into a Surface Mount Package
  Keith Bennett Galvanic isolation is used in a variety of industries, most commonly to provide safety
  against potentially lethal voltages. Isolation is also used to eliminate the effects of noise
  and common mode voltage differences created by ground loops, or as a level shifter
  between dissimilar operating voltages. Typically, building an isolated system requires
  a number of passive and active components on either side of the isolation barrier, in
  addition to the barrier components themselves. These barrier components can be
  optical, magnetic, capacitive, RF or even GMR (giant magnetoresistance) devices.
  Barrier components are notoriously difficult to use, adding significant design
  time and cost to isolated systems. With
  this in mind, Linear Technology has
  developed a line of ВµModuleВ® isolators that reduces the design of isolated
  systems to simply plugging in a module—no complex barrier components
  are required. In fact, ВµModule isolators
  require no external components at all.
  Linear Technology ВµModule isolators
  use magnetically coupled techniques to
  provide data and power isolation in a
  single package. The result is an easy-touse, low power, robust solution with
  excellent field immunity. The LTM2881
  isolated RS485/RS422 transceiver and LTM2882 dual isolated RS232 transceivers use ВµModule isolator technology
  to provide complete transceiver-pluspower solutions in 15mm Г— 11.25mm …

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Manufacturer's Classification

• Interface > Isolated Transceivers > µModule Isolated Transceivers
• Interface > RS485/RS422 Transceivers | Extended Temperature (H & MP) Interface