Power factor correction ICs simplify PFC implementation

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Toshiba Electronics Europe has launched two highly integrated control ICs aimed at simplifying implementation of the power factor correction (PFC) needed to reduce harmonic distortion of supply currents in ac powered applications.

The TB6818FG is a continuous conduction mode IC, optimised for use in applications such as high end battery chargers and large lcd and pdp televisions with power supply requirements above 200W. Targeted at lower power, sub 200W requirements, the TB6819FG critical conduction mode IC is designed for applications such as ac adaptors and lighting equipment. Supplied in SSOP16 and SSOP8 packages respectively, the ICs are compact devices with high levels of integrated functionality. Features include protection against dc input overvoltage, power factor correction output overvoltage and undervoltage lockout, as well as feedback loop open detection and thermal shutdown. In addition, the TB6818FG incorporates an FET protection circuit, audible noise reduction, pulse output mute functionality and configurable ac instantaneous stop detection. Brownout protection is included as standard. Featuring an operating voltage range of 8.4 to 26V, the TB6818FG is rated for a typical startup voltage of 10V. Operating voltages for the TB6819FG range from 10. to 25V with a typical startup voltage of 12V. Both devices have a maximum drive current of 1.0A and current consumption in standby mode for the TB6818FG is rated at 250µA.