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25 W wide-range high power factor buck-boost converter demonstration board using the L6564H

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Parameter NameParameter Value
Target ApplicationAC-DC Topologies
Core ProductL6564H
Packing TypeNot Applicable
RoHs compliantEcopack1
Package NameCARD

This application note describes a wide-range non-isolated 25 W regulated LED driver with high power factor. The EVL6564H-25W-BB demonstration board is well-suited to the Japanese market due to the broad use of standard 100 Vac lighting applications and also 200 Vac tubes in building automation systems.

The EVL6564H-25W-BB demonstration board has been designed in order to obtain the highest possible power factor over the entire input mains voltage, remaining compliant to EN55022 Class-B and keeping the average output current in a tight band with different LED characteristics.

The board is based on ST's L6564H power factor controller and the SEA05L CC-CV controller for LED current regulation in a non-isolated flyback configuration. The form factor has been designed to fit into a standard LED driver case, facilitating the replacement of the incandescent flood lamps up to 80-100 W power.

Key features
  • Line voltage range: 85 to 265 Vac
  • Minimum line frequency (fL): 47-63 Hz
  • LED string voltage drop: 70 V ±10% (23 LED p.n. X42182)
  • LED nominal current: 350 mA ±1%
  • LED current ripple pk-pk: 100 mA
  • Rated output power: 25 W
  • Power factor > 0.9
  • Efficiency: > 89 % at 230 V
  • Maximum ambient temperature: 50 °C
  • Conducted EMI: In acc. with EN55022 class-B
  • Overvoltage, open loop and short-circuit protection