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Product Detailed Parameters
- Description：IC OFFLINE SWITCH QUASI RES CTRL
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT),Cut Tape (CT)
- Output Isolation：Isolated
- Internal Switch(s)：No
- Voltage - Breakdown：-
- Topology：Flyback
- Voltage - Start Up：19.5 V
- Voltage - Supply (Vcc/Vdd)：15V ~ 27.5V
- Duty Cycle：-
- Frequency - Switching：30kHz ~ 120kHz
- Fault Protection：Over Current, Over Temperature, Over Voltage, Short Circuit
- Control Features：Frequency Control, Soft Start
- Operating Temperature：-40°C ~ 105°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 BD7685FJ-LBE2 is an offline switch quasi-resonant controller IC manufactured by ROHM Semiconductor, designed for isolated flyback power converters. It features auto-restart capability and a 650V circuit rating. The device supports external switching MOSFETs and current detection resistors to enable flexible power supply designs. Key electrical characteristics include a maximum switching frequency of 120 kHz and an operating temperature range from -40°C to 105°C. It incorporates under-voltage lockout, thermal shutdown, and over-current protection mechanisms.
Feature Summary
- Quasi-resonant operation for low EMI
- Auto-restart capability
- Integrated protection functions including UVLO and thermal shutdown
Applications
- Isolated flyback power supplies
- AC/DC converter systems with electrical outlets
- Industrial equipment power modules
Procurement Notes
Verify the specific suffix LBE2 indicates tape and reel packaging configuration. Confirm RoHS compliance status through official datasheets. Check for obsolescence notices as product lifecycles may change. Ensure compatibility with external MOSFET voltage ratings exceeding 650V. Validate pinout against SOP-J8 package dimensions for PCB layout accuracy.
Selection Notes
Select this component for applications requiring quasi-resonant control to minimize electromagnetic interference. Suitable for designs needing integrated protection features without external monitoring circuits. Consider the 650V rating when choosing external switching devices. Evaluate thermal performance within the specified -40°C to 105°C operating range. Compare with similar models like BD7682FJ-LB if different frequency or voltage specifications are required.
Part Context
This part belongs to ROHM's AC/DC converter IC family targeting industrial and consumer electronics markets. It complements other quasi-resonant controllers in the BD76xx series. The device addresses efficiency and EMI reduction requirements in modern power supply designs. It integrates control logic with protection features to simplify system architecture.
Replacement Considerations
BD7682FJ-LB is a related quasi-resonant controller model. Verify functional equivalence regarding switching frequency and protection features before substitution. Check package compatibility and pinout alignment. Review datasheet differences for voltage ratings and operating temperature ranges.
