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).
●Features
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●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
