Product Profile :

The FT838NB/FT838RNA controller device is optimized for high-performance, low power switching mode power supply applications. The  FT838NB/FT838RNA 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 FT838NB can achieve both highest average efficiency and fast dynamic load response. FT838RNA is optimized for LED driver applications with slightly higher (~22uA) standby current.

Furthermore, FT838NB/FT838RNA features fruitful protections like Open Circuit Protection and Over Temperature Protection to eliminate the external protection circuits and provide reliable operations. FT838NB/FT838RNA is available in SOP8 package.

Feature :

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

Proprietary technology enabling high efficiency and fast dynamic response

No audible noise over entire operating range

Built-in power NPN 

Built-in Cable Compensation

Built-in Line Compensation

Primary-side feedback eliminates opto-coupler and TL431

Cycle-by-Cycle Current Limiting

Over Temperature Protection

VCC Over Voltage Protection

Open Circuit Protection


datasheet Part No.: FT838xx Version: 0.82 Update: 2018-06-04 Supported Part Nos: FT838R、FT838NBx、FT838Dx download: ft838xx_ds_rev0.82_en_官网简版.pdf