DESCRIPTION
   The PT6978L is a single-stage buck controller that achieves high power factor and accurate current for LED lighting applications. Integrated 650V MOSFET to decrease physical volume.
   The PT6978L integrates APFC function and the high PF value is achieved by constant on-time operation mode. The PT6978L works in Quasi-Resonant switching mode, it can reduce the switching losses and improve the EMI performance.

FEATURES
• Integrated 650V MOSFET.
• High PF≥0.9 with single stage conversion.
• Real-current control technique achieves accurate
   constant LED current.
• Quasi-Resonant switching mode to achieve low
   switching losses.
• ± 3% output current accuracy.
• Excellent line regulation and load regulation.
• Low start-up current: 15μA typical.
• Reliable short LED and open LED protection.
• System auto-restart function.
• VCC over voltage protection.
• VCC under voltage protection (UVLO).
• Cycle by cycle current limiting.
• Over temperature protection (OTP).
• SOP-7 package.

APPLICATIONS
• GU10, E27 LED Bulb lamp.
• Others Led Lighting.