TI Offers UCC2851x Family of Controllers

Texas Instruments Inc. (TI, Dallas, TX) introduced its new UCC2851x family of combination controllers, which combines power-factor correction (PFC) and pulse-width modulation (PWM) functions onto one integrated circuit for off-line distributed power systems such as desktop and server power converters, and monitor and display power systems.

The UCC2851x family provides complete control functionality for any off-line power system that meets IEC 1000-3-2 harmonic reduction requirements. The PWM stage in the UCC2851x features programmable, maximum-duty cycle and PWM frequency options that are twice the base PFC frequency. For the PFC stage, the controllers offer enhanced transient response through an improved multiplier and a transconductance amplifier.

The UCC2851x Series also features high-current gate drive outputs rated at 3A sink and 2A source to reduce switching losses in the power devices and to allow higher frequency operation. The family offers different under-voltage lockout threshold options for both PFC and PWM stages to support different bias schemes and load transient requirements.

The UCC2851x family of controllers is available now in 20-pin, wide-body, small outline, integrated circuit and plastic, dual in-line packaging. A UCC28517 evaluation module is scheduled to be available by the end of the first quarter with a universal line input, 100W PFC output with 12V, 8W bias rail supply design. Pricing in quantities of 1,000 units is $1.69.