AL1698

Description

The AL1698 is a high performance, high power factor, high efficiency, and high current precision buck-boost and flyback dimmable LED driver for triac dimmable LED lamp applications. The AL1698 topology provides an accurate output current over wide line and load regulation. The wide switching frequency operates at boundary conduction mode (BCM) to ease EMI/EMC design and testing, to meet the latest regulatory standards.

The AL1698 LED driver has a built-in high voltage JFET, which provides the system fast start-up time and enables users an easy and stable VCC supply design. The AL1698 also integrates a 600V/2A high voltage MOSFET. It can cover 230Vac triac dimmable applications with eliminating the external high voltage MOSFET and VCC startup resistors, which will reduce the system BOM cost. The AL1698 has the built-in thermal fold-back protection trigger point to automatically reduce output current. Other protection features enhance LED lighting system's safety and reliability.

The AL1698 dimming curve is compliant with the NEMA SSL6 standard. The AL1698 applies to a wide range of dimmers, including leading edge and trailing edge dimmer, to achieve deep dimming down to 1%.

Feature(s)

• Tight Current Sense Tolerance : ± 3%
• Low Startup Current: 100µA Typical
• Low Operation Current: 310µA
• Single Winding Inductor
• Wide Range of Dimmer Compatibility
• Integration of 600V/2A MOSFET
• Integration of HV JFET
• NEMA SSL6 Dimming Curve Compliant
• Internal Protections
  
  • Under Voltage Lockout (UVLO)
  • Leading-Edge Blanking (LEB)
  • Cycle-By-Cycle Over Current Protection (OCP)
  • Output Open/Short Protection (OVP/OSP)
  • Thermal Foldback Protection (TFP)
  • Over-Temperature Protection (OTP)

Application(s)

• Mains dimmable LED lamps/Offline LED Power Supply