Switching Regulators (Isolated type)
Switching Regulators (Isolated type)

Switching Regulators (Isolated type)

ROHM’s BD7F series of switching regulators is comprised of isolated flyback converters designed for DC/DC conversion in isolated power supplies for industrial equipment. The optimized optocoupler-less design reduces the number of parts required, providing greater space savings while maintaining reliability. In addition, adaptive ON-time control technology eliminates the need for external phase compensation.

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      Supporting Information

       

      Overview

      Conventionally, in order to stabilize the output voltage of isolated power supplies methods using limited life components such as Optocouplers and/or auxiliary winding are employed.
      In contrast, ROHM has developed isolated flyback DC/DC converter controllers that eliminate the need for these types of feedback circuits.
      The simple, efficient design is ideal for industrial power supplies (i.e. FA equipment), power storage systems, and high power inverters.

      Samples/Evaluation Board

      Evaluation Board Materials「BD7F100HFN-EVK-001」

      In addition to samples of the BD7F100xxx-LB and BD7F200xxx-LB, an evaluation board integrating the BD7F100HFN-LB will be available for purchase through online distributors.
      The BD7F100HFN-EVK-001 evaluation board makes it easy to evaluate and verify operation of ROHM's isolated flyback DC/DC converter controller (24V input, 5V/800mA output).

      Evaluation board lineup

      Type Part No. Image IC Board size
      X/Y [mm]
      Vin [V] Vout
      [V]
      Iout
      [A]
      User's
      Guide
      Distribution
      Inventory
      Isolated Flyback DCDC Converter BD7F100EFJ-EVK-001 BD7F100EFJ-EVK-001 BD7F100EFJ-LB 70 / 50 24 5 1.0 User's
      Guide
      Check
      Isolated Flyback DCDC Converter BD7F100EFJ-EVK-002 BD7F100EFJ-EVK-002 BD7F100EFJ-LB 70 / 50 24 +15/-15 0.165 User's
      Guide
      Check
      Isolated Flyback DCDC Converter BD7F100EFJ-EVK-003 BD7F100EFJ-EVK-003 BD7F100EFJ-LB 70 / 50 5 5 0.2 User's
      Guide
      Check
      Isolated Flyback DCDC Converter BD7F100HFN-EVK-002 BD7F100HFN-EVK-002 BD7F100HFN-LB 70 / 50 24 5 1.0 User's
      Guide
      Check
      Isolated Flyback DCDC Converter BD7F100HFN-EVK-003 BD7F100HFN-EVK-003 BD7F100HFN-LB 70 / 50 24 +15/-15 0.165 User's
      Guide
      Check
      Isolated Flyback DCDC Converter BD7F100HFN-EVK-004 BD7F100HFN-EVK-004 BD7F100HFN-LB 70 / 50 5 5 0.2 User's
      Guide
      Check
      Isolated Buck DCDC Converter BD7F200EFJ-EVK-001 BD7F200EFJ-EVK-001 BD7F200EFJ-LB 90 / 70 24 15 x 4ch 0.150 User's
      Guide
      Check
      Isolated Buck DCDC Converter BD7F200EFJ-EVK-002 BD7F200EFJ-EVK-002 BD7F200EFJ-LB 70 / 50 24 5 2.0 User's
      Guide
      Check
      Isolated Buck DCDC Converter BD7F200HFN-EVK-001 BD7F200HFN-EVK-001 BD7F200HFN-LB 90 / 70 24 15 x 4ch 0.150 User's
      Guide
      Check
      Isolated Buck DCDC Converter BD7F200HFN-EVK-002 BD7F200HFN-EVK-002 BD7F200HFN-LB 70 / 50 24 5 2.0 User's
      Guide
      Check

      Lineup

      Part No. Technical
      Document
      Evaluation
      Board
      Package Output
      Power
      Max.
      Input Voltage
      Input
      Voltage Range
      Over
      current
      Limit
      Switching
      Frequency
      Functions
      BD7F100HFN-LB Download Distribution
      Inventory
      HSON8
      (2.9×3.0×0.6mm)
      1W (Vin=5V)
      5W (Vin=24V)
      45V 3.0~40V 1.25A 400kHz
      (Typ.)
      Enable Soft Start Efficient Light
      Load Mode UVLO Over Current
      Protection Theminal Protection
      BD7F100EFJ-LB Download Distribution
      Inventory
      HSOP-J8
      (4.9×6.0×1.0mm)
      BD7F200HFN-LB Download Distribution
      Inventory
      HSON8
      (2.9×3.0×0.6mm)
      10W(Vin=24V) 8.0~40V 2.75A
      BD7F200EFJ-LB Download Distribution
      Inventory
      HSOP-J8
      (49×6.0×1.0mm)

      Feature 1:No Optocoupler or auxiliary winding required contributes to greater miniaturization

      Conventional Method and New BD7F100HFN

      Applying feedback at the primary side in order to detect the voltage and current at the secondary side eliminates the need for a Optocoupler or auxiliary winding along with other necessary components. This simplifies design considerably, resulting in improved reliability, greater energy savings, and increased miniaturization. Stable output voltage is achieved using just a single resistor.

      Feature 2:Adaptive ON time control improves load response characteristics

      Adaptive On-Time

      Conventional isolated power supply control ICs are susceptible to large variations in output voltage with instantaneous load current fluctuations. In response, ROHM developed an adaptive ON time control method based on the market-proven ON time control design utilized for non-isolated power supply control ICs.
      This new method significantly improves response characteristics against instantaneous load current fluctuations, reducing output voltage variations by more than 65% - to less than 200mV (at a load current of 1A and rise time of 100µs) - resulting in improved reliability.