UC3853

ACTIVE

75kHz bipolar continuous conduction mode (CCM) PFC controller, 0°C to 70°C

Product details

Vin (max) (V) 40 Operating temperature range (°C) 0 to 70 Control mode CCM Topology Boost, PFC controller Rating Catalog Features Average current mode, Continuous Control Mode, Overvoltage protection Duty cycle (max) (%) 95
Vin (max) (V) 40 Operating temperature range (°C) 0 to 70 Control mode CCM Topology Boost, PFC controller Rating Catalog Features Average current mode, Continuous Control Mode, Overvoltage protection Duty cycle (max) (%) 95
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • Complete 8-pin Power Factor Solution
  • Reduced External Components
  • RMS Line Voltage Compensation
  • Precision Multiplier/Squarer/Divider
  • Internal 75kHz Synchronizable Oscillator
  • Average Current Mode PWM Control
  • Overvoltage Protection Comparator
  • High Current, Clamped Gate Driver
  • Complete 8-pin Power Factor Solution
  • Reduced External Components
  • RMS Line Voltage Compensation
  • Precision Multiplier/Squarer/Divider
  • Internal 75kHz Synchronizable Oscillator
  • Average Current Mode PWM Control
  • Overvoltage Protection Comparator
  • High Current, Clamped Gate Driver

The UC3853 provides simple, yet high performance active power factor correction. Using the same control technique as the UC1854, this 8-pin device exploits a simplified architecture and an internal oscillator to minimize external component count. The UC3853 incorporates a precision multiplier/squarer/divider circuit, voltage and current loop error amplifiers, and a precision voltage reference to implement average current mode control with RMS line voltage compensation. This control technique maintains constant loop gain with changes in input voltage, which minimizes input line current distortion over the worldwide input voltage range.

The internal 75kHz oscillator includes an external clock input, allowing synchronization to downstream converters. Additionally, the device features an overvoltage protection comparator, a clamped MOSFET gate driver which self-biases low during undervoltage lockout, and low startup and supply current.

These devices are available in 8-pin plastic and ceramic dual in-line (DIP) packages, and 8-lead small outline (SOIC) packages. The UC1853 is specified for operation from \x9655°C to +125°C, the UC2853 is specified for operation from \x9625°C to +85°C, and the UC3853 is specified for operation from 0°C to +70°C.

The UC3853 provides simple, yet high performance active power factor correction. Using the same control technique as the UC1854, this 8-pin device exploits a simplified architecture and an internal oscillator to minimize external component count. The UC3853 incorporates a precision multiplier/squarer/divider circuit, voltage and current loop error amplifiers, and a precision voltage reference to implement average current mode control with RMS line voltage compensation. This control technique maintains constant loop gain with changes in input voltage, which minimizes input line current distortion over the worldwide input voltage range.

The internal 75kHz oscillator includes an external clock input, allowing synchronization to downstream converters. Additionally, the device features an overvoltage protection comparator, a clamped MOSFET gate driver which self-biases low during undervoltage lockout, and low startup and supply current.

These devices are available in 8-pin plastic and ceramic dual in-line (DIP) packages, and 8-lead small outline (SOIC) packages. The UC1853 is specified for operation from \x9655°C to +125°C, the UC2853 is specified for operation from \x9625°C to +85°C, and the UC3853 is specified for operation from 0°C to +70°C.

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Technical documentation

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Type Title Date
* Data sheet High Power Factor Preregulator datasheet 05 Sep 1999
Application note AC Requirements for Power Factor Correction Circuits 28 Mar 2002
Application note DN-77 Overcurrent Shutdown with the UC3853 05 Sep 1999
Application note DN-78 UC3853 Demo Board 05 Sep 1999
Application note U-159 Boost Power Factor Corrector Design with the UC3853 05 Sep 1999

Design & development

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PDIP (P) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian

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