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Product Detailed Parameters
- Description：IC OFFLINE SWITCH FLYBACK 8SOP
- Series：-
- Mfr：Fremont Micro Devices Ltd
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Isolation：Isolated
- Internal Switch(s)：Yes
- Voltage - Breakdown：700V
- Topology：Flyback
- Voltage - Start Up：17.6 V
- Voltage - Supply (Vcc/Vdd)：6.6V ~ 30V
- Duty Cycle：-
- Frequency - Switching：-
- Fault Protection：Current Limiting, Open Circuit, Over Temperature, Over Voltage
- Control Features：-
- Operating Temperature：-40°C ~ 125°C (TA)
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOP
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Power (Watts)：-
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Overview
The FT838NB2-RT is a low-power offline flyback controller from Fremont Micro Devices, designed for high-performance constant-current and constant-voltage applications. It utilizes proprietary primary-side control technology to eliminate the need for opto-couplers and TL431s, thereby reducing component count and cost. The device integrates a power NPN transistor with a 700V breakdown voltage and operates within a supply voltage range of 6.6V to 30V. It supports a maximum output power of 18W and functions reliably across an ambient temperature range of -40°C to 125°C.
Feature Summary
- Primary-side regulation eliminates opto-couplers and TL431s for simplified design
- Integrated power NPN transistor with 700V rating reduces external components
- Built-in cable and line compensation ensures stable output performance
- Comprehensive protection features including over-temperature, VCC over-voltage, and open circuit detection
Applications
- Adapters and chargers for portable devices such as cell phones and PDAs
- Set-top boxes (STB) auxiliary and standby power supplies
- AC/DC LED driver applications
Procurement Notes
Verify the specific suffix 'NB2' against official Fremont Micro Devices documentation to confirm pinout compatibility and electrical specifications relative to other FT838 variants. Ensure the 8-SOP package matches your PCB footprint requirements. Cross-reference the datasheet for any updates on RoHS compliance status or lead-free manufacturing processes before finalizing procurement orders.
Selection Notes
Select this component for designs requiring isolated flyback conversion without secondary-side feedback loops. It is suitable for applications prioritizing efficiency and dynamic response while minimizing bill-of-materials costs. Consider the integrated 700V NPN capability when designing for higher voltage isolation requirements. Evaluate thermal management needs given the operating temperature range up to 125°C.
Part Context
The FT838NB2-RT belongs to the FT838 family of offline controllers, which includes variants like the FT838NB and FT838RNA. These devices share core technologies for primary-side regulation but may differ in packaging, specific electrical tolerances, or target application optimizations such as LED driving versus general adapter use. The NB2 variant specifically denotes the 8-SOP package configuration.
Replacement Considerations
Direct substitutes are not explicitly confirmed in public documentation. Verify compatibility with generic primary-side flyback controllers only after confirming pinout alignment and electrical parameter equivalence. Consult Fremont Micro Devices for official cross-reference recommendations.
