Optocoupler-less Isolated Flyback Converter - BD7F200HFN-LB

This product guarantees long time supply availability in the industrial instrumentation market.
BD7F200 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. Furthermore, a highly by the use of the Original Adapted-Type ON-Time Control Technology, it makes the external phase compensation parts become unnecessary, therefore a highly efficient isolated type power supply application can easily be produced.

Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD7F200HFN-LBTR Active HSON8 3000 3000 Taping Yes
FET Integrated
Controller Type PWM
Output Power [W] 5W@Vin=12V 10W@Vin=24V
Switch Current Limit(Typ.)[A] 2.75
Vin1(Min.)[V] 8.0
Vin1(Max.)[V] 40.0
SW frequency(Max.)[MHz] 400.0
Channel 1
Light Load mode Yes
EN Yes
Soft Start Yes
Thermal Shut-down Recovery
Under Voltage Lock Out Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 125
    • 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)
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Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.