AC/DC isolated offline LED controller chip

The new product is an isolated flyback LED power controller that was developed to meet demanding design criteria: support for triac dimming; high PFC and fewer external parts by achieving active PFC with a single converter; and no use of opto-couplers and detectors for average LED current control of the second side of the transformer. The power factor value (PF) is more than 0.8-0.9 with standard 120-220V AC, and the accuracy of LED output current is ±5 per cent.

LED lighting offers low power consumption and a long operating life. Toshiba is developing products that feature control of higher power LED, that support dimming and higher PF, and that deliver more accurate output current with higher efficiency.