FT838NB Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – Low-Power Off-Line CC/CV Switch

Fremont Micro Devices
FT838NB/FT838RNA
Low-Power Off-Line CC/CV Switch
FEATURES
DESCRIPTION
 Constant-Current (CC) and Constant-Voltage
The FT838NB/FT838RNA controller device is
(CV) with Primary Side Control
 Proprietary technology enabling high
ly ^{efficiency and fast dynamic response}
 No audible noise over entire operating range
n _{ Built-in power NPN}
 Built-in Cable Compensation
O _{ Built-in Line Compensation}
 Primary-side feedback eliminates
e _{opto-coupler and TL431}
s ^{ Cycle-by-Cycle Current Limiting}
 Over Temperature Protection
U _{ VCC Over Voltage Protection}
 Open Circuit Protection
A _{TYPICAL APPLICATION}
S _{ Adapter/Charger for Cell/Cordless Phones,}
U PDAs, MP3 and Other Portable Apparatus
 Standby and Auxiliary Power Supplies
o ^{Set Top Boxes (STB)}
Fremontmicr ^{ AC/DC LED Driver applications}
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.
© 2012 Fremont Micro Devices Inc.
Confidential Rev. 0.8
DS838NB/838RNA-A-page1