Fuji Electric Co., Ltd. offers a lineup of power supply control ICs that support a variety of power circuits. Particularly, they feature high efficiency, low standby power, and low noise. 

To comply with various environment-related regulations, they incorporate many protection functions in the ICs. Thus, they enable smaller power supply circuits. 

The company has developed the FA1B10N critical mode PFC control IC and the FA6C64N current resonant control IC for power supplies for LED lights.  It has started offering these ICs targeting manufactures of power supplies for LED lights. 

With the trend toward smaller and lighter electronic equipment, adoption of wide range of switching power supplies continues to grow.  Accordingly, electronic devices, including LED lights, are necessary to satisfy both longer life and low price, and higher reliability and reduced power supply cost.

Improved Efficiency

To meet these requirements, Fuji Electric has combined the two ICs, while inheriting functions of its conventional products.  As a result, the company has improved efficiency of power supply system during light loads, low standby power, and reduced costs through the reduction of the number of power supply components. 

International standard IEC61000-3-2 necessitates power supply system with output power of 75W or higher to have a power factor correction (PFC) circuit, which suppresses harmonics that adversely affects power quality. The critical mode PFC control IC has achieved AC (single phase) input voltage of 230V, power factor of 95 percent or higher at 50 percent of the maximum output power, and 5 percent or lower total harmonic distortion (THD).

The PFC control IC’s power factor and THD improvement function has enabled these achievements. In comparison with the company’s previous product, its power factor improved more than 4.9 percent from 93.3 percent to 98.2 percent, and THD from 9.3 percent to 4.7 percent.

Two combined ICs enables LLC control IC implements detection. At light loads, both the PFC control IC and the LLC control IC automatically switch from normal mode operation to burst mode operation. In the burst mode, standby power does not require auxiliary power supply.  Hence the ICs enable 300mW or lower input power at no load under the worldwide input voltage. 

Furthermore, as the ICs incorporate an X-capacitor discharge function, auto burst mode control. Also, FET drive power supply, they also reduce the number of power supply components.