FT839NB Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – High Efficiency Off-Line CC/CV Switch

Fremont Micro Devices
Preliminary FT839NB/839MB
High Efficiency Off-Line CC/CV Switch
FEATURES
DESCRIPTION
 Constant-Current (CC) and
The FT839NB/FT839MB controller device is
Constant-Voltage (CV) with Primary Side
Control
 Proprietary technology enabling high
l ^{efficiency and fast dynamic response}
 Satisfies DoE Level VI requirements for
ia ^{5V/1A and 5V/1.5A applications}
 No audible noise over entire operating
t range
 Optimization for capacitive loading
n  Built-in power NPN/MOS
 Built-in Cable Compensation
e _{ Built-in Line Compensation}
 Primary-side feedback eliminates
id ^{opto-coupler and TL431}
 Cycle-by-Cycle Current Limiting
f _{ Over Temperature Protection}
 VCC Over Voltage Protection
n _{ CV Open-loop Protection}
 Excellent capacitive loading start-up
o _performance
C ^{TYPICAL APPLICATION}
optimized for high-performance, low power
switching mode power supply applications. The
FT839NB/FT839MB 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 FT839NB/FT839MB
can achieve both highest average efficiency，
fast dynamic load response and super low
standby power. FT839NB and FT839MB satisfy
DoE Level VI requirements with production
margin for 5V/1A and 5V/1.5A applications,
respectively.
Furthermore, FT839NB/FT839MB features
fruitful protections like Open Circuit Protection
and Over Temperature Protection to eliminate
the external protection circuits and provide




Adapter/Charger for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
D _{Standby and Auxiliary Power Supplies}
Set Top Boxes (STB)
Adapter for ADSL / WiFi Wireless
FM ^{AC/DC LED Driver applications}
reliable operations. FT839NB/FT839MB is
available in SOP8 package.
© 2013 Fremont Micro Devices Inc.
Confidential Rev0.80
DS839NB/MB-A0-Page1