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Design Notes

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  Increasing Output Voltage and Current Range Using Series- Connected Isolated ОјModule Converters &mdash DN530
  PDF, 172 Kb, File published: Jul 22, 2014
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  Increasing Output Voltage and Current Range Using SeriesConnected Isolated µModule Converters – Design Note 530
  Jesus Rosales and Willie Chan
  Linear Technology’s isolated µModule ® converters
  are compact solutions for breaking ground loops.
  These converters employ a flyback architecture whose
  maximum output current varies with input voltage and
  output voltage. Although their output voltage range
  is limited to a maximum of 12V, one can increase the
  output voltage or the output current range. The solution simply involves connecting the secondary side
  of two or more isolated ВµModule converters in series.
  The LTM В®8057 and LTM8058 UL60950-recognized
  2kV AC isolated ВµModule converters will be used to
  demonstrate this design approach, which can also be
  applied to the LTM8046, LTM8047 and LTM8048. Let’s
  assume an output of 10V at 300mA is desired from
  a 20V input. Reviewing the maximum output current
  curve from Figure 1, we notice that a single LTM8057
  is insufficient to meet the output current requirement
  under these conditions.
  However, upon noticing that a single LTM8057 can
  deliver 300mA at 5V from a 20V input, a solution becomes apparent. Since the output voltage is isolated
  from the input, the outputs of two LTM8057s set at
  5V can be connected in series to achieve a 10V output …

Articles

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  µModule Converters Take the Hassle Out of Designing Isolated Power Supplies &mdash LT Journal
  PDF, 2.1 Mb, File published: Apr 24, 2012
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  design ideas ВµModule Converters Take the Hassle Out of Designing
  Isolated Power Supplies
  David Ng Sometimes a system needs a little bit of isolated power, but designing an isolated power
  supply is rarely easy. The nature of isolated supplies makes them complicated and touchy,
  resulting in late nights and long weekends spent on design and debug. The LTM8047
  and LTM8048 ВµModule converters take the hassle out of designing isolated power
  supplies, placing a flyback regulator in a compact 9mm Г— 11.25mm Г— 4.92mm BGA
  RoHS compliant package. The controller, power switching and rectification elements,
  as well as transformer and isolated feedback circuitry are all integrated. Both parts
  operate from 3.1V to 32V inputs and produce over 1W of isolated power. The LTM8048
  is identical to the LTM8047, but adds an integrated 300mA linear post regulator. The linear post regulator integrated
  into the LTM8048 is a high performance 300m A device, boasting a low
  dropout of less than 450mV at room
  temp, full load. As shown in Figure 4,
  the output noise and ripple of the post LTM8047
  VIN 2.2ВµF RUN
  BIAS 4.7ВµF 7.15k LTspice IV ADJ circuits.linear.com/553 VOUT
  5V
  280mA
  (15VIN) VOUT
  ISOLATION BARRIER VIN
  3.1V TO 29V SS
  GND 22ВµF VOUT– 725VDC ISOLATION Figure 2. The LTM8048 is the …

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Manufacturer's Classification

• µModule Solutions > µModule Regulators > Isolated µModule Converters | Extended Temperature (H & MP) µModule Regulators

Other Names:

LTM8047IYPBF, LTM8047IY PBF