3.67 W constant voltage / constant current flyback LED driver circuit design

Heng Jiaxing AO3401

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Summary:

A circuit diagram of a universal input 10.5 V, 350 mA constant voltage / constant current flyback power supply designed with LinkSwitch-II LNK605DG (U1) for LED driver applications. This design is designed to drive three LED strings that provide the rated output current for the LED over the entire VF range.

design feature

• Can be loaded with an enlarged GU-10 lamp holder
• Accurate primary side constant voltage / constant current controller eliminates secondary side control and optocoupler
• Increase efficiency without current sense resistors
• Low component quantity solution that reduces costs
• Overtemperature protection – Strict tolerance range (±5%) plus hysteresis recovery ensures PCB temperature is safe under all conditions
• Automatic restart output short circuit and open loop protection
• Extremely energy efficient
• Full load efficiency over the entire operating voltage range exceeds 74%
• No-load power consumption <200 mW at 265 VAC input
• Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)
• Green package: halogen-free and RoHS compliant

10.5V 350mA LED Driver Circuit Diagram

See the uploading documentation for details (click to download)