SD3803AF

Overview

SD3803AF is a high-performance primary-side-feedback LED constant-current driver for isolated flyback LED power supplies below 7W across 85Vac~265Vac. It integrates a 600V power switch and requires no secondary-side feedback or compensation circuit; very few external components provide excellent constant-current regulation. Its ultra-low operating current eliminates the need for transformer auxiliary-winding detection and supply, reducing component count, system cost, and size. High-precision current sensing operates in discontinuous inductor-current mode (TM), providing accurate LED current and excellent line regulation. The LED open-circuit voltage is precisely controlled by an external resistor. Integrated protections include LED open/short-circuit, CS-resistor short-circuit, undervoltage, and intelligent chip-temperature control. Features: · Integrated 600V power device · Primary-side-feedback constant-current control; no secondary feedback · No transformer auxiliary-winding detection or supply · LED open-circuit voltage adjustable by external resistor · Ultra-low operating current · Wide input-voltage range · ±6% LED output-current accuracy · LED open/short-circuit protection · CS-resistor short-circuit protection · Undervoltage lockout (UVLO) · Intelligent chip-temperature control Applications: · LED globe bulbs · GU10 LED spotlights · Other LED lighting

Applications

• LED globe bulbs
• GU10 LED spotlights
• Other LED lighting