AC-DC LED Drivers | FL7733A

LED Driver with Power Factor Correction, Primary-Side-Regulated

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Overview

The FL7733A is a highly-integrated PWM controller with advanced Primary-Side Regulation (PSR) technique to minimize components in low-to-mid-power LED lighting converters.
Using an innovative TRUECURRENT® technology to provide tight tolerance constant-current output, this LED driver enables designs with constant current (CC) tolerance of less than ±1% over the universal line voltage range to meet stringent LED brightness requirements.
By minimizing turn-on time fluctuation, high power factor and low THD over the universal line range are obtained in the FL7733A. 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 FL7733A also provides powerful protections, such as LED short / open, output diode short, sensing resistor short / open, and over-temperature for high system reliability.
The FL7733A controller is available in an 8-pin Small-Outline Package (SOP).

  • Lighting
  • LED Lighting – Mid Power – Non dimming
  • LED Lighting – Mid Power- Analog/PWM dimming
  • LED Lighting – Low Power – Non dimming
  • LED Lighting – Low Power – Analog/PWM dimming
  • LED Lighting – High Power – Non dimming
  • LED Lighting – High Power- Analog/PWM dimming
  • LED Lighting
  • Performance
  • < ±3% Total Constant Current Tolerance Over All Conditions
  • < ±1% Over Universal Line Voltage Variation
  • < ±1% from 50% to 100% Load Voltage Variation
  • < ±1% with ±20% Magnetizing Inductance Variation
  • Primary-Side Regulation (PSR) Control for Cost-Effective Solution without Requiring Input Bulk Capacitor and Secondary Feedback Circuitry
  • Application Input Voltage Range: 80 VAC - 308 VAC
  • High PF of > 0.9, and Low THD of < 10% Over Universal Line Input Range
  • Fast < 200 ms Start-up (at 85 VAC) using Internal High-Voltage Start-up with VDD Regulation
  • Adaptive Feedback Loop Control for Startup without Overshoot
  • 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)
  • Cycle-by-Cycle Current Limit

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FL7733AMX

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Active

CAD Model

Pb

A

H

P

SOIC-8

751EB

1

260

REEL

2500

Y

PSR PFC Flyback

17.5

308 VAC

18 VGATE

60/180 mA - Source/Sink

70

$0.3877

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