ROHM Product Detail

BD7F100EFJ-LB
Optocoupler-less Isolated Flyback Converter

This product guarantees long time supply availability in the industrial instrumentation market. BD7F100EFJ-LB 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.

We recommend BD7F100UEFJ-LB for your new development. It uses different production lines for the purpose of improving production efficiency. Electric characteristics noted in Datasheet does not differ between Production Line.

Data Sheet Buy Sample
Data Sheet Buy Sample

Product Detail

 
Part Number | BD7F100EFJ-LBE2
Status | Active
Package | HTSOP-J8
Packing Type | Taping
Unit Quantity | 2500
Minimum Package Quantity | 2500
RoHS | Yes

Specifications:

FET

Integrated

Controller Type

PWM

Output Power [W]

1W@Vin=5.0V 5W@Vin=24V

Switch Current Limit(Typ.)[A]

1.25

Vin1(Min.)[V]

3

Vin1(Max.)[V]

40

SW frequency (Max.)[kHz]

400

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

Package Size [mm]

4.9x6.0 (t=1.0)

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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)

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.

Product Information

Reference Design / Application Evaluation Kit

 

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