Home Power management AC/DC & isolated DC/DC switching regulators Power factor correction (PFC) controllers

UC3854

ACTIVE

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

A newer version of this product is available

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Same functionality with different pin-out to the compared device
UCC28180 ACTIVE 18-kHz-250-kHz CCM PFC controller with enhanced startup & transient response enhanced startup and transient response

Product details

Topology Boost Control mode CCM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 16/10 Vin (max) (V) 30 Features Average current mode, Continuous Control Mode, Enable Rating Catalog Operating temperature range (°C) 0 to 70 Duty cycle (max) (%) 95
Topology Boost Control mode CCM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 16/10 Vin (max) (V) 30 Features Average current mode, Continuous Control Mode, Enable Rating Catalog Operating temperature range (°C) 0 to 70 Duty cycle (max) (%) 95
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • 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
  • 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

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.

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

Design & development

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PDIP (N) 16 View options
SOIC (DW) 16 View options

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