UC3854

ACTIVE

Bipolar CCM PFC controller supporting line freq. across 50Hz-400Hz range, 0°C to 70°C

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Product details

Parameters

Device type Single-phase PFC Control method CCM Operating supply (Max) (V) 30 Operating supply current (mA) 10 UVLO thresholds on/off (V) 16/10 Features Average Current Mode, Enable Rating Catalog Operating temperature range (C) 0 to 70 open-in-new Find other Power factor correction (PFC) controllers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Power factor correction (PFC) controllers

Features

  • Control Boost PWM to 0.99 Power Factor
  • Limit Line-Current Distortion to < 5%
  • World-Wide Operation Without Switches
  • Feedforward Line Regulation
  • Average Current-Mode Control
  • Low Noise Sensitivity
  • Low Startup Supply Current
  • Fixed-Frequency PWM Drive
  • Low-Offset Analog Multiplier and Divider
  • 1-A Totem-Pole Gate Driver
  • Precision Voltage Reference

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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 and divider, a current amplifier, and a fixed-frequency PWM.

In addition, the UC1854 contains a power MOSFET-compatible gate driver, 7.5-V reference, line anticipator, load-enable comparator, low-supply detector, and overcurrent comparator.

The UC1854 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.

The high reference voltage and high oscillator amplitude of the UC1854 minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200 kHz. The UC1854 is used in single-phase and three-phase systems with line voltages that vary from 75 V to 275 V and line frequencies across the 50-Hz to 400-Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC1854 features low starting supply current.

These devices are available packaged in 16-pin plastic and ceramic dual in-line packages, and a variety of surface-mount packages.

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Technical documentation

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Type Title Date
* Datasheet UCx854 High-Power Factor Preregulator datasheet (Rev. A) Dec. 16, 2016
Application notes AC Requirements for Power Factor Correction Circuits Mar. 28, 2002
Application notes Accurate PWM Duty Cycle Clamp Jan. 25, 2002
Application notes DN-39E Optimizing Performance in UC3854 Power Factor Correction Applications Sep. 05, 1999
Application notes DN-41 Extend Current Transformer Range Sep. 05, 1999
Application notes U-134 UC3854 Controlled Power Factor Correction Circuit Design Sep. 05, 1999

Design & development

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CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options

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