AL1678-20B/10B/08B
UNIVERSAL, 500V BUCK LED DRIVER Description Pin Assignments NEW PRODUCT The AL1678-20B/10B/08B is a universal AC input (85 to 277 VAC),
high efficiency and high accuracy Buck LED driver. The AL167820B/10B/08B topology provides accurate constant current over line
and load regulation with tight tolerance В±3%, operating at boundary
conduction mode (BCM) to ease in EMI/EMC qualification and testing
to meet the latest regulatory laws. (Top View) The AL1678-20B/10B/08B single Buck stage system works with a
single winding inductor and High voltage MOSFET included,
therefore, can use fewer external components and create a low bill of
material (BOM) cost solution. The AL1678-20B/10B/08B has rich
protection features to enhance the system safety and reliability. It has
thermal fold back function, which can reduce the output current when
the driver’s temperature is higher than the setting value. 7 Drain 3 6 LC 4 5 CS OUT 1 VCC 2 ROVP
GND SO-7
The AL1678-20B/10B/08B is available in SO-7 package. Applications Features
п‚ п‚ п‚ п‚ п‚ п‚ п‚ п‚ п‚ п‚ п‚ п‚ > 90% Efficiency
Valley Switching to Achieve Low Switching Loss
Universal 85 to 277 VAC Input Range
Internal MOSFET up to 500V
Tight Current Sense Tolerance: В±3%
Low Start-up Current: 170ВµA
Low Operation Current: 100ВµA (Static)
Single Winding Inductor
Internal Protections Under Voltage Lock Out (UVLO) Leading-edge Blanking (LEB) Output Open/Short Protection Open-load and Reload Detection Thermal Fold-back Function Over Temperature Protection (OTP) …