BD7F100HFN-LB
Optocoupler-less Isolated Flyback Converter
BD7F100HFN-LB
Optocoupler-less Isolated Flyback Converter
This product guarantees long time supply availability in the industrial instrumentation market. BD7F100HFN-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
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]
2.9x3 (t=0.6)
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
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-LB | 70 / 50 | 24 | 5 | 1.0 | User's Guide |
Check | |
Isolated Flyback DCDC Converter | BD7F100EFJ-EVK-002 | BD7F100EFJ-LB | 70 / 50 | 24 | +15/-15 | 0.165 | User's Guide |
Check | |
Isolated Flyback DCDC Converter | BD7F100EFJ-EVK-003 | BD7F100EFJ-LB | 70 / 50 | 5 | 5 | 0.2 | User's Guide |
Check | |
Isolated Flyback DCDC Converter | BD7F100HFN-EVK-002 | BD7F100HFN-LB | 70 / 50 | 24 | 5 | 1.0 | User's Guide |
Check | |
Isolated Flyback DCDC Converter | BD7F100HFN-EVK-003 | BD7F100HFN-LB | 70 / 50 | 24 | +15/-15 | 0.165 | User's Guide |
Check | |
Isolated Flyback DCDC Converter | BD7F100HFN-EVK-004 | BD7F100HFN-LB | 70 / 50 | 5 | 5 | 0.2 | User's Guide |
Check | |
Isolated Buck DCDC Converter | 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-LB | 70 / 50 | 24 | 5 | 2.0 | User's Guide |
Check | |
Isolated Buck DCDC Converter | 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-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
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
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.
Related Information
Product Information
Reference Design / Application Evaluation Kit
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- Evaluation Board - BD7F100HFN-EVK-002
Isolated Flyback DC-DC converter, 24Vin, 5Vout, 1.0A, HSON8
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- Evaluation Board - BD7F100HFN-EVK-003
Isolated Flyback DC-DC converter, 24Vin, +/-15Vout, 0.165A, HSON8
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- Evaluation Board - BD7F100HFN-EVK-004
Isolated Flyback DC-DC converter, 5Vin, 5Vout, 0.2A, HSON8