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Fairchild Semiconductor - Primary-Side-Regulated LED Driver

Numéro de référence FL7733MX
Description Primary-Side-Regulated LED Driver
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FL7733MX fiche technique
July 2014
FL7733
Primary-Side-Regulated LED Driver with Power Factor
Correction
Features
High Performance
Cost-Effective Solution without Requiring Input Bulk
Capacitor and Secondary Feedback Circuitry
Power Factor Correction
THD <10% Over Universal Line Range
Constant Current Tolerance:
< ±1% Over Universal Line Voltage Variation
< ±1% by 50% - 100% Load Voltage Variation
< ±1% by ±20% Magnetizing Inductance Variation
High-Voltage Startup with VDD Regulation
Adaptive Feedback Loop Control for Startup without
Overshoot
High Reliability
LED Short / Open Protection
Output Diode Short Protection
Sensing Resistor Short / Open Protection
VDD Over-Voltage Protection (OVP)
VDD Under-Voltage Lockout (UVLO)
Over-Temperature Protection (OTP)
All Protections are Auto Restart (AR)
Cycle-by-Cycle Current Limit
Application Input Voltage Range: 80 VAC - 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller with advanced
Primary-Side Regulation (PSR) technique provides
features to enhance the performance of low-to-mid-
power LED lighting converter. The FL7733 LED driver is
designed with minimum system components while LED
current is accurately controlled by Fairchild’s
TRUECURRENT® technique and improved feedback
loop control. Constant Current (CC) tolerance less than
±1% over the universal line voltage range meets the
requirement of highly reliable LED brightness
management.
By minimizing turn-on time fluctuation, high power
factor, and low THD; <10% THD over the universal line
range can be obtained. An integrated high-voltage
startup circuit implements fast startup and high system
efficiency. During startup, adaptive feedback loop
control anticipates the steady-state condition and sets
initial feedback condition close to the steady state to
ensure no overshoot or undershoot of LED current.
The FL7733 provides powerful protections, such as LED
short / open, output diode short, sensing resistor short /
open, and over-temperature for high system reliability.
The FL7733 controller is available in an 8-pin Small-
Outline Package (SOP).
Related Resources
AN-5076 Design High Power Factor Flyback Converter
using FL7733 for LED Driver with Ultra-Wide Output
Voltage
AN-FEBFL7733_L50U008A User Guide for
FEBFL7733_L50U008A Evaluation Board of 8.4 W LED
Driver (PFC PSR Flyback)
AN-FEBFL7733_L52U050A User Guide for
FEBFL7733_L52U050A Evaluation Board of 50 W LED
Driver (PFC PSR Flyback)
Ordering Information
Part Number Operating Temperature Range
FL7733MX
-40°C to +125°C
Package
8-Lead, Small Outline Package (SOP-8)
Packing Method
Tape & Reel
© 2014 Fairchild Semiconductor Corporation
FL7733 • Rev. 1.0.2
www.fairchildsemi.com

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