Circuit Design of 1.25W Non-isolated Constant Current LED Driver

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

Summary:

The circuit is a non-isolated constant current (CC) power supply with a buck-boost topology to drive the LEDs. Typical applications are night lights, neon billboard replacements, emergency exit signs or any application that uses LEDs for illumination.

design feature

• Worldwide AC Input Voltage Range - One Design Worldwide
• Accurate and stable constant current output
• Small size and light weight
• A low cost, low component count solution for replacing passive RC buck mode power supplies
• The adopted topology is highly secure in the event of a fault - the load can be protected
• High efficiency (efficiency >60% at 85 VAC input)
• Easily increase output power with larger LinkSwitch-TN products
• Meet EN55022 B requirements for EMI

Circuit diagram of 1.25W non-isolated constant current LED driver

See the uploading documentation for details (click to download)