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Product Detailed Parameters
- Description：PWM TYPES DCDC CONVERTER IC
- Series：BD28C5xFJ-LB
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Isolation：Isolated
- Internal Switch(s)：Yes
- Voltage - Breakdown：-
- Topology：Flyback
- Voltage - Start Up：-
- Voltage - Supply (Vcc/Vdd)：6.9V ~ 28V
- Duty Cycle：48%
- Frequency - Switching：23kHz, 26.5kHz
- Fault Protection：Current Limiting, UVLO
- Control Features：Frequency Control, Soft Start
- Operating Temperature：-40°C ~ 125°C
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOP-J
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Power (Watts)：-
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Overview
The BD28C57LFJ-LBE2 is a PWM type DC/DC converter IC designed for AC/DC power supplies. It supports both isolated and non-isolated topologies with a single output. The device operates within an input voltage range of 6.9 V to 28 V, delivering up to 20 mA output current at 28 V. It features a switch frequency capability up to 500 kHz and includes VDD UVLO, thermal shutdown, and per-cycle overcurrent protection. Operating temperature spans from -40°C to +125°C in a SOP-J8 package.
Feature Summary
- Supports both isolated and non-isolated AC/DC converter designs
- Integrates VDD under-voltage lockout and thermal shutdown protection
- Provides per-cycle overcurrent limiting via external sense resistor
- Enables flexible switching frequency setting through RTCT pins
Applications
- Low-power AC/DC power supply modules
- Industrial equipment power systems
- Consumer electronics requiring isolated or non-isolated conversion
Procurement Notes
Verify the exact suffix LBE2 against the manufacturer's latest datasheet to confirm packaging and tape specifications. Ensure the design accounts for the specified operating temperature range and input voltage limits. Confirm that the SOP-J8 package dimensions align with the target PCB layout requirements before finalizing procurement.
Selection Notes
Select this component when designing low-power AC/DC converters requiring flexible topology options. It is suitable for applications needing integrated protection features like UVLO and thermal shutdown. Consider the external RTCT pin configuration for frequency adjustment and ensure the output current requirement does not exceed 20 mA.
Part Context
This part belongs to the BD28C5xFJ-LB series of PWM current-mode DC/DC converter ICs. The series is characterized by low power consumption and support for Si and SiC MOSFETs. It allows for simple design of various low-power power converters by utilizing external components for current sensing and frequency setting.
Replacement Considerations
Check the BD28C56LFJ-LBE2 as a potential alternative within the same series. Verify compatibility regarding input voltage ranges, output capabilities, and package dimensions before substitution.
