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

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.

Applications

 LED Lighting System