UC3854NG4 Datasheet PDF - TI

●DESCRIPTION

●The UC1854 provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC1854 contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector,and over-current comparator.

●FEATURES

●• Control Boost PWM to 0.99 Power Factor

●• Limit Line Current Distortion To <5%

●• World-Wide Operation Without Switches

●• Feed-Forward Line Regulation

●• Average Current-Mode Control

●• Low Noise Sensitivity

●• Low Start-Up Supply Current

●• Fixed-Frequency PWM Drive

●• Low-Offset Analog Multiplier/Divider

●• 1A Totem-Pole Gate Driver

●• Precision Voltage Reference