Typical Application


Ø   Constant-Current (CC) and Constant-Voltage (CV) with Primary Side Control

Ø   Proprietary technology enabling high efficiency and fast dynamic response

Ø   Satisfy DoE Level 6 requirements from 5V/1A to 5V/2.4A applications

Ø   No audible noise over entire operating range

Ø   Optimization for capacitive loading

Ø   Built-in power NPN/MOS

Ø   Built-in Cable Compensation

Ø   Built-in Line Compensation

Ø   Primary-side feedback eliminates opto-coupler and TL431

Ø   Cycle-by-Cycle Current Limiting

Ø   Over Temperature Protection

Ø   VCC Over Voltage Protection

Ø   CV Open-loop Protection


Ø   Excellent capacitive loading start-up performance


 The FT839NX/FT839MX controller device is optimized for high-performance, low power switching mode power supply applications. The FT839NX/FT839MX facilitates CC/CV charger design by eliminating an opto-coupler and TL431. Its highly integrated functions such as Under Voltage Lockout (UVLO), Leading Edge Blanking (LEB) and built-in cable compensation offer the users a high efficiency and low cost solution for AC/DC power applications.  


Power supplies built with FT839NX/FT839MX can achieve both highest average efficiency fast dynamic load response and super low standby power. FT839NX and FT839MX satisfy DoE Level 6 requirements with production margin from 5V/1A to 5V/2.4A applications, respectively.


Furthermore, FT839NX/FT839MX features fruitful protections like Open Circuit Protection and Over Temperature Protection to eliminate the external protection circuits and provide reliable operations. FT839NX is available in SOP8/DIP8 package. FT839MX is available in SOP8 package.


Ø   Adapter/Charger for Cell/Cordless Phones,

PDAs, MP3 and Other Portable Apparatus

Ø   Standby and Auxiliary Power Supplies

Set Top Boxes (STB)

Ø   Adapter for ADSL / WiFi Wireless


Ø   AC/DC LED Driver applications