BD7F100HFN-LBTR

Overview

The BD7F100HFN-LBTR is an isolated flyback switching regulator IC manufactured by ROHM Semiconductor. It features a synchronous rectifier-free design with adjustable output voltage starting from 0.78V and supports up to 50V switch voltage. The device delivers a maximum switch current of 1A and operates at a fixed switching frequency of 400kHz. It accepts an input voltage range between 3V and 40V. Packaged in an 8-PowerUDFN (8-HSON) surface-mount case, it is designed for positive, isolated output configurations.

Feature Summary

• Utilizes adaptive on-time control technology to enhance load transient response speed without requiring external phase compensation components.
• Eliminates the need for optocouplers and transformer tertiary windings for feedback, simplifying circuit design.
• Integrates multiple protection functions including over-current protection, over-voltage protection, thermal shutdown, and under-voltage lockout.

Applications

• Isolated power supplies for industrial equipment
• Adapters and chargers requiring galvanic isolation
• General-purpose isolated DC/DC conversion systems

Procurement Notes

Verify the specific suffix LBTR corresponds to the tape-and-reel packaging format required for your assembly line. Confirm that the 8-HSON package dimensions align with your PCB footprint specifications. Ensure the selected component meets the RoHS3 compliance standards mandated by your target market regulations before finalizing procurement orders.

Selection Notes

Select this component when designing isolated flyback converters that require high transient response performance without complex feedback loops. It is suitable for applications needing adjustable output voltages within the specified range and operating temperatures from -40°C to 125°C. Consider the 1A switch current limit when determining the maximum power requirements for your specific transformer design.

Part Context

This part belongs to the BD7F series of optocoupler-less isolated flyback converters. The series is characterized by its proprietary adaptive on-time control technology, which improves efficiency and reduces component count compared to traditional isolated converter designs. It targets markets demanding compact, reliable, and cost-effective isolated power solutions.

Replacement Considerations

Check for direct substitutes within the BD7F family or other ROHM isolated flyback controllers. Verify pin compatibility and electrical parameter equivalence if considering alternatives from different manufacturers.

FAQ

Does the BD7F100HFN-LBTR require an optocoupler for operation?

No, it uses adaptive on-time control technology to regulate output voltage without an optocoupler or transformer tertiary winding.

What is the typical switching frequency of this IC?

The typical switching frequency is 400kHz during normal PWM operation.