Single-Stage PFC Primary-Side-Regulation Offline LED Driver
Description
FLS3217 / FLS3247 — Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
July 2014
FLS3217 / FLS3247 Single-Stage PFC Primary-Side-Regulation Offline LED Driver with Integrated Power MOSFET
Features
Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
Power-Factor Correction (PFC) Integrated Power MOSFET Accurate Constant-Current (CC) Control
Independent Online Voltage, Output Voltage, and Magnetizing Inductance Variation
Linear Frequency Control for Increased Efficiency Open / Short-LED Protection Cycle-by-Cycle Current Limiting Over-Temperature Protection with Auto Restart Low Startup Current: 20μA Low Operating Current: 5mA VDD Over-Voltage Protection (OVP) VDD Under-Voltage Lockout (UVLO)
Application Voltage Range: 80 VAC ~ 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller with power MOSFET, FLS3217 / FLS3247, provides several features to enhance the performance of low-power flyback converters.
The proprietary topology enables simplified circuit design for LED lighting applications.
By using the single-stage topology with primary-side regulation, an LED lighting board can be implemented with the few external components and minimized cost; requiring no input bulk capacitor or feedback circuitry.
To implement good power factor and low THD, constant on-time control is utilized with an external capacitor connected to COMI.
Precise constant-current control regulates accurate output current versus changes in input voltage and output voltage.
The operating frequency is proportionally changed by the output voltage to guarantee DCM operation with higher efficiency and simple design.
FLS3217 and FLS3247 provide protection features such as open-LED, short-LED, and over-temperature protection.
The current-limit level is automatically reduced to minimize the output current and protect external components in short-LED condition.
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