FT833XXX Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – High Precision PSR Constant Current LED Driver

Fremont Micro Devices
FT833xxx
High Precision PSR Constant Current LED Driver
FEATURES
DESCRIPTION
 Built-in 650V power MOSFET
FT833xxx is a high precision primary-side feedback
 PSR constant current control without
and regulation constant current driver for LED
secondary sense and feedback circuit
lighting applications. It is designed to work in
 No auxiliary winding for sensing and supplying
 Ultra low operating current for high efficiency
 Universal input voltage
l ^{ ±3% LED current accuracy}
 Choice for maximum duty cycle and OVP
tia ^voltage
 Precision OVP voltage for best LED open
circuit protection
 LED short circuit protection
n _{ CS resistor short circuit protection}
e  VCC under-voltage protection
 Over temperature compensation
fid ^{ Available in SOP8 and DIP8 packages}
n _APPLICATIONS
o _{ Isolated solid state lighting}
C ^{ GU10/E27 LED bulb, spot light}
inductor current discontinuous conduction mode
(DCM) and is especially suitable for flyback
converter under universal input. Under universal
input voltage from 90V to 264V, the system output
power for FT833Sxx, FT833Axx, FT833Bxx (SOP8)
and FT833BD (DIP8) is recommended to be no
more than 3W, 6W, 9W, and 12W, respectively.
The FT833xx integrates a 650V power MOSFET
and eliminates secondary sense and feedback
circuit. The loop compensation components are also
removed while maintaining stability over all
operating conditions. It uses a source drive
architecture and special demagnetization sensing
technology with very low operating current, the
auxiliary winding for sensing the output and
supplying the chip is therefore eliminated, resulting
in low component counts and small system size.
With its highly accurate current sense method, the
FMD ^{ Other LED lighting}
FT833xxx realizes ±3% accuracy of LED current
along with excellent line and load regulation.
The multi-protection function of FT833xxx can
greatly enhance the system reliability and safety.
The FT833xxx features LED open/short circuit
protection, CS resistor short circuit protection, over
temperature compensation and VCC UVLO
protection. The industry leading OVP voltage
accuracy ensures the best LED open circuit
protection.
© 2013 Fremont Micro Devices Inc.
Confidential Rev1.1
DS833xxx-A-page1