UC3854 - High Power Factor Preregulator
Product Code: Components-Mixed-UC3854
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- 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
The UC3854 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 UC3854 contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC3854 contains a power MOSFET compatible gate driver, 7.5V reference,line anticipator, load-enable comparator, low-supply detector,and over-current comparator.
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