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Partno Mfg Dc Qty AvailableDescript
UC2853DUCN/a247avaiHigh Power Factor Preregulator
UC2853DTIN/a503avaiHigh Power Factor Preregulator
UC2853DTI/UNITRODEN/a55avaiHigh Power Factor Preregulator
UC2853DG4TI/BBN/a15avaiHigh Power Factor Preregulator 8-SOIC -25 to 85
UC2853NTIN/a24avaiHigh Power Factor Preregulator
UC2853NTI/UNITRODEN/a2avaiHigh Power Factor Preregulator
UC2853NTI/BB N/a65avaiHigh Power Factor Preregulator


UC2853D ,High Power Factor PreregulatorBLOCK DIAGRAMUDG-94120-111/97UC1853UC2853UC3853ABSOLUTE
UC2853D ,High Power Factor PreregulatorELECTRICAL CHARACTERISTICSUC1853; –25°C to +85°C for the 2853; and 0°C to +70°C for the UC3853; VCC ..
UC2853D ,High Power Factor PreregulatorUC1853UC2853UC3853High Power Factor PreregulatorDESCRIPTION
UC2853DG4 ,High Power Factor Preregulator 8-SOIC -25 to 85features anovervoltage protection comparator, a clamped MOSFET gate driver which• Overvoltage Prote ..
UC2853N ,High Power Factor PreregulatorFEATURES• Complete 8-pin Power Factor The UC3853 provides simple, yet high performance active power ..
UC2853N ,High Power Factor PreregulatorMAXIMUM RATINGS CONNECTION DIAGRAMSupply Voltage (VCC)..40VDIL-8, SOIC-8 (Top View)Output Drive Cur ..
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UC2853D-UC2853DG4-UC2853N
High Power Factor Preregulator
UC1853
UC2853
UC3853

The UC3853 provides simple, yet high performance active power factor
correction. Using the same control techniqueas the UC1854, this 8-pin de-
vice exploitsa simplified architecture and an internal oscillatorto minimize
external component count. The UC3853 incorporatesa precision multi-
plier/squarer/divider circuit, voltage and current loop error amplifiers, anda
precision voltage referenceto implement average current mode control
with RMS line voltage compensation. This control technique maintains con-
stant loop gain with changesin input voltage, which minimizes input line
current distortion over the worldwide input voltage range.
The internal 75kHz oscillator includesan external clock input, allowing syn-
chronizationto downstream converters. Additionally, the device featuresan
overvoltage protection comparator,a clamped MOSFET gate driver which
self-biases low during undervoltage lockout, and low startup and supply
current.
These devices are availablein 8-pin plastic and ceramic dual in-line (DIP)
packages, and 8-lead small outline (SOIC) packages. The UC1853is
specified for operation from –55°Cto +125°C, the UC2853is specified for
operation from –25°Cto +85°C, and the UC3853is specified for operation
from 0°Cto +70°C.
High Power Factor Preregulator 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
BLOCK DIAGRAM
FEATURES DESCRIPTION
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