ROHM Semiconductor

BD7F100 Optocoupler-less Isolated Flyback Converters

ROHM offers its BD7F100 optocoupler-less isolated flyback converters for industrial equipment isolated power supply applications

Image of ROHM Semiconductor's BD7F100 Optocoupler-less Isolated Flyback ConvertersROHM Semiconductor's BD7F100 is an optocoupler-less isolated flyback converter. An optocoupler, or the tertiary winding feedback circuit, which was needed to obtain a stable output voltage isolated by a transformer in the conventional application becomes unnecessary; thus, the number of parts is reduced drastically, producing a small-sized and high-reliability application-isolated type power supply.

It uses original adapted-type ON-time control technology to realize high-speed load response making external phase compensation parts unnecessary; therefore, a highly efficient, isolated type power supply application can easily be produced.

Features
  • Guaranteed long time supply availability for industrial applications
  • No need for an optocoupler or a transformer tertiary winding
  • The output voltage can be set by two external resistors and the transformer turns ratio
  • Uses original adapted type ON-time control technology
  • High-speed load response is realized and external phase compensation parts are unnecessary
  • Fixed switching frequency and low output ripple
  • Highly efficient light load mode available (PFM operation)
  • Shutdown / enable control
  • Built-in N-channel MOSFET
  • Soft start function
  • Output load compensation function
  • Protection functions:
    • VIN under voltage lock-out (VIN UVLO)
    • Over-current protection (OCP)
    • Thermal shutdown protection (TSD)
Published: 2016-05-04

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