UC3854N - 

PFC Controller IC, 15 V to 35 V & 10 mA Supply, 15 V Lockout, 95 % Duty Cycle, 102 kHz, DIP-16

UC3854N - PFC Controller IC, 15 V to 35 V & 10 mA Supply, 15 V Lockout, 95 % Duty Cycle, 102 kHz, DIP-16

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Newark Part No.:
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Product Overview

The UC3854N is a High Power Factor Preregulator that 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, it contains a voltage amplifier, an analogue 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. The UC3854 uses average current-mode control to accomplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.
  • 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 analogue multiplier/divider
  • 1A Totem-pole gate driver
  • Precision voltage reference
  • Green product and no Sb/Br


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