AL1677 (Obsolete)

Description

The AL1677 is an universal AC input (85~277 VAC rectified), high efficiency and high accuracy Buck LED driver converter. The AL1677 topology provides accurate constant current (CC) line and load regulation, operating at boundary conduction mode (BCM) to ease in EMI/EMC qualification and testing to meet the latest regulatory laws.

The AL1677 system removes the auxiliary winding and external high voltage MOSFET with a few external components to create a low bill material (BOM) cost solution. The AL1677 has rich protection features to improve the system safety and reliability. It has thermal feedback function which can reduce the output current when the driver’s temperature is higher than the setting value.

Feature(s)

• >90% Efficiency
• Valley Detection to Minimize Switching Loss
• Universal Rectified 85 to 277 VAC Input Range
• Internal MOSFET up to 500V
• Tight Current Sense Tolerance: ±3%
• Low Startup Current: 170µA
• Low Operation Current: 100µA
• Standard Inductor (No auxiliary winding)
• Internal Protections:
  
  • Undervoltage Lockout (UVLO)
  • Leading-Edge Blanking (LEB)
• Output Open Protection
• Output Short Protection
• Open-Load and Reload Detection
• Thermal Fold-Back Function
• Overtemperature Protection
• SO-8 Package

Application(s)

• Retrofit LED Lamps
• High Voltage DC-DC LED Driver
• General Purpose Constant Current Source