LED Driver IC (PT6918)

Manufacturer

Princeton Technology Corp.

The PT6918 is a primary side regulation single stage Flyback and PFC controller for offline LED lighting. It achieves high power factor and accurate constant LED current with single-power-stage for isolated lighting applications.

 

The PT6918 integrates a 650V power MOSFET to decrease physical volume. It provides accurate LED current control from primary-side information. Eliminating the secondary-side feedback components and the opto-coupler significantly simplifies the LED lighting system design.

 

The PT6918 integrates PFC function and the high PF value is achieved by constant on-time operation mode. The PT6918 works in Quasi-Resonant switching mode to reduce the switching losses and improve the EMI performance.

 

The multi-protection features of PT6918 greatly enhance the system reliability and safety. The PT6918 provides input over voltage protection, short LED  protection, open LED protection, over temperature protection, cycle-by-cycle current limiting, etc.

FEATURES
• Integrated 650V MOSFET.
• High PF>0.9 with single stage conversion.
• Real-current control technique achieves accurate constant LED current.
• Primary Side Regulation eliminates secondary feedback circuit.
• Quasi-Resonant switching mode to achieve low switching losses.
• 0.3V primary current sense reference voltage leads to a lower conduction loss.
• ±3% output current accuracy.
• Excellent line regulation and load regulation.
• Low start-up current, 15μA typically.
• Reliable multi-protection features.
• System auto-restart function.
• SOP8 package.