AC-DC LED Drivers | FL7733

Primary-Side-Regulated LED Driver with Power Factor Correction

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Overview

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 ON Semiconductor’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).

  • Lighting
  • 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 OvershootHigh Reliability
  • LED Short / Open Protection
  • Output Diode Short Protection
  • Sensing Resistor Short / Open Protection
  • VDD Over-Voltage Protection (OVP)
  • VDD Under-Voltage Lockout (UVLO)
  • All Protections are Auto Restart (AR)
  • Over-Temperature Protection (OTP)
  • Application Input Voltage Range: 80 VAC - 308 VAC
  • Cycle-by-Cycle Current Limit

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FL7733MX

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Obsolete

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Pb

A

H

P

SOIC-8

751EB

1

260

REEL

2500

N

PSR Flyback

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