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UC3852

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Bipolar transition mode PFC controller, 0°C to 70°C

UC3852 is in the process of being discontinued
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UCC28056 ACTIVE 6-pin high performance CRM/DCM PFC controller Replacement

Product details

Topology Boost Control mode TM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 16.3/11.5 Vin (max) (V) 30 Features < 150 W applications, Peak current mode, Transition Control Mode, Undervoltage protection Rating Catalog Operating temperature range (°C) 0 to 70 Duty cycle (max) (%) 95
Topology Boost Control mode TM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 16.3/11.5 Vin (max) (V) 30 Features < 150 W applications, Peak current mode, Transition Control Mode, Undervoltage protection Rating Catalog Operating temperature range (°C) 0 to 70 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
  • Low-Cost Power Factor Correction
  • Power Factor Greater Than 0.99
  • Few External Parts Required
  • Controlled On-Time Boost PWM
  • Zero-Current Switching
  • Limited Peak Current
  • Min and Max Frequency Limits
  • Starting Current Less Than 1mA
  • High-Current FET Drive Output
  • Under-Voltage Lockout
  • Low-Cost Power Factor Correction
  • Power Factor Greater Than 0.99
  • Few External Parts Required
  • Controlled On-Time Boost PWM
  • Zero-Current Switching
  • Limited Peak Current
  • Min and Max Frequency Limits
  • Starting Current Less Than 1mA
  • High-Current FET Drive Output
  • Under-Voltage Lockout

The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters.

The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle. Even though switching frequency varies with both load and instantaneous line voltage, it can be maintained within a reasonable range to minimize noise generation.

While allowing higher peak switch currents than continuous PFCs such as the UC1854, this device offers less external circuitry and smaller inductors, yet better performance and easier line-noise filtering than discontinuous current PFCs with no sacrifice in complexity or cost. The ability to obtain a power factor in excess of 0.99 makes the UC1852 an optimum choice for low-cost applications in the 50 to 500 watt power range. Protection features of these devices include under-voltage lockout, output clamping, peak-current limiting, and maximum-frequency clamping.

The UC1852 family is available in 8-pin plastic and ceramic dual in-line packages, and in the 8-pin small outline IC package (SOIC). The UC1852 is specified for operation from -55°C to +125°C, the UC2852 is specified for operation from -40°C to +85°C, and the UC3852 is specified for operation from 0°C to +70°C.

The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters.

The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle. Even though switching frequency varies with both load and instantaneous line voltage, it can be maintained within a reasonable range to minimize noise generation.

While allowing higher peak switch currents than continuous PFCs such as the UC1854, this device offers less external circuitry and smaller inductors, yet better performance and easier line-noise filtering than discontinuous current PFCs with no sacrifice in complexity or cost. The ability to obtain a power factor in excess of 0.99 makes the UC1852 an optimum choice for low-cost applications in the 50 to 500 watt power range. Protection features of these devices include under-voltage lockout, output clamping, peak-current limiting, and maximum-frequency clamping.

The UC1852 family is available in 8-pin plastic and ceramic dual in-line packages, and in the 8-pin small outline IC package (SOIC). The UC1852 is specified for operation from -55°C to +125°C, the UC2852 is specified for operation from -40°C to +85°C, and the UC3852 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 U-132 Power Factor Correction Using UC3852 Controlled On-Time Zero Current 05 Sep 1999

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PDIP (P) 8 View options
SOIC (D) 8 View options

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