BD28C55FJ-LBE2

Overview

The BD28C55FJ-LBE2 is a PWM type AC/DC converter IC manufactured by ROHM Semiconductor. It operates within an input voltage range of 6.9 V to 28 V and provides a fixed output voltage of 28 V. The device supports a maximum output current of 20 mA and functions at a switching frequency of 53 kHz with a maximum duty cycle of 100%. Quiescent supply current is 1.1 mA. It is housed in a SOP-J8 surface-mount package and is rated for operation between -40 °C and +125 °C.

Feature Summary

• PWM current mode control architecture
• VDD pin under-voltage lockout functionality
• Per-cycle overcurrent protection capability

Applications

• Low power isolated flyback converters
• Non-insulated DC/DC conversion systems
• Industrial equipment power supplies

Procurement Notes

Verify the specific suffix against official documentation to confirm exact electrical characteristics, as variations exist within the series. Ensure compatibility with external Si or SiC MOSFETs if used in insulated topologies. Confirm package integrity and thermal ratings match the target application environment before finalizing procurement.

Selection Notes

Select this component for applications requiring a fixed 28 V output from a wide input range. The integrated PWM controller simplifies design compared to discrete solutions. Consider the 53 kHz switching frequency for EMI management and the low quiescent current for efficiency optimization in standby modes.

Part Context

This part belongs to the BD28C5xFJ-LB series of PWM AC/DC converters. These ICs are designed to simplify the design of various low-power power converters by supporting both insulated and non-insulated devices. The series includes variants with different output voltages and configurations.

Replacement Considerations

Check the BD28C57LFJ-LB datasheet for similar PWM features, though it specifies a different maximum switching frequency. Verify that any substitute maintains the required 28 V output and SOP-J8 package form factor.