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FL7733

Part Number	FL7733
Manufacturer	Fairchild Semiconductor
Description	Primary-Side-Regulated LED Driver
Published	Jun 22, 2015
Detailed Description	July 2014 FL7733 Primary-Side-Regulated LED Driver with Power Factor Correction Features High Performance  Cost-Effec...
Datasheet	FL7733 PDF File

Overview

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-midpower 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 ...

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