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.

Product Detail

 
Part Number | BD7F100EFJ-LBE2
Status | Recommended
Package | HTSOP-J8
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
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]

3.0

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

Package Size [mm]

4.9x6(t=1)

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.

Evaluation
Board

 
    • Evaluation Board
    • BD7F100EFJ-EVK-001
    • BD7F100EFJ-EVK-001 Evaluation board delivers an output 5 volts from an input 24 volts using BD7F100EFJ-LB, Isolated Flyback DC/DC converter integrated circuit, with output current rating of maximum 1A.

  • User's Guide Buy
    • Evaluation Board
    • BD7F100EFJ-EVK-002
    • BD7F100EFJ-EVK-002 Evaluation board delivers outputs 15volts and -15 volts from an input 24 volts using BD7F100EFJ-LB, Isolated Flyback DC/DC converter integrated circuit, with output current rating of maximum 0.165A

  • User's Guide Buy
    • Evaluation Board
    • BD7F100EFJ-EVK-003
    • BD7F100EFJ-EVK-003 Evaluation board delivers outputs 5 volts from an input 5 volts using BD7F100EFJ-LB, Isolated Flyback DC/DC converter integrated circuit, with output current rating of maximum 1A.

  • User's Guide Buy

Design Resources

 

Documents

User's Guide

  • Evaluation Board User's Guide for BD7F100EFJ-EVK-001 user's guide
  • Evaluation Board User's Guide for BD7F100EFJ-EVK-002 user's guide
  • Evaluation Board User's Guide for BD7F100EFJ-EVK-003 user's guide

Reference Design

  • BD7Fx00xxx-LB Series Reference Circuit

Technical Articles

Schematic Design & Verification

  • Importance of Probe Calibration When Measuring Power: Deskew
  • Impedance Characteristics of Bypass Capacitor

Thermal Design

  • What Is Thermal Design
  • Method for Calculating Junction Temperature from Transient Thermal Resistance Data
  • Thermal Resistance

Tools

2D/3D/CAD

  • BD7F100EFJ-LB Footprint / Symbol
  • HTSOP-J8 Footprint / Symbol
  • HTSOP-J8 3D STEP Data

Packaging & Quality

Package Information

  • Package Information
  • Anti-Whisker formation

Manufacturing Data

  • Factory Information

Environmental Data

  • UL94 Flame Classifications of Mold Compound
  • Compliance with the ELV directive
  • REACH SVHC Non-use Declaration
  • RoHS Comission Delegated Directive

Export Information

  • The Export Control Order
  • Export Administration Regulations(EAR)