Single-Stage Primary-Side-Regulation PWM Controller - Fairchild Semiconductor
Description
FL7730 — Single-Stage Primary-Side-Regulation PWM Controller for PFC and LED Dimmable Driving
FL7730 Single-Stage Primary-Side-Regulation PWM Controller for PFC and LED Dimmable Driving
Features
Compatible with Traditional TRIAC Control
(No need to change existing lamp infrastructure: wall switch & wire)
Compatible with Non-Dimming Lamp Designs Cost-Effective Solution without Input Bulk Capacitor
and Feedback Circuitry
Power Factor Correction (PFC) Accurate Constant-Current (CC) Control,
Independent Online Voltage, Output Voltage, Magnetizing Inductance Variation
Line Voltage Compensation for CC Control Linear Frequency Control for Better Efficiency and
Simple Design
Open-LED Protection Short-LED Protection Cycle-by-Cycle Current Limiting Over-Temperature Protection with Auto Restart Low Startup Current: 20 μA Low Operating Current: 5 mA SOP-8 Package Available Application Voltage Range: 80 VAC ~ 308 VAC
Applications
LED Lighting System
Description
This highly integrated PWM controller, FL7730, provides several features to enhance the performance of singlestage flyback converters.
The proprietary topology, TRUECURRENT® enables the simplified circuit design for LED lighting applications.
TRIAC dimming is smoothly managed by dimming brightness control without flicker.
By using single-stage topology with primary-side regulation, an LED lighting board can be implemented with few external components and minimized cost.
It does not require an input bulk capacitor or feedback circuitry.
To implement good power factor and low total harmonic distortion, constant on-time control is utilized with an external capacitor connected to the COMI pin.
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 Discontinuous Conduction Mode (DCM) operation with higher efficiency and simpler design.
The FL7730...
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