UC2853AD ,High Power Factor Preregulator 8-SOIC -40 to 105MAXIMUM RATINGS CONNECTION DIAGRAMSupply Voltage (VCC)..40VPDIP-8, SOIC-8 (Top View)Output Drive Cu ..
UC2853ADG4 ,High Power Factor Preregulator 8-SOIC -40 to 105FEATURES• Complete 8-pin Power Factor The UC2853A provides simple, yet high performance active powe ..
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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 ..
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UC2853AD-UC2853ADG4
High Power Factor Preregulator
UC2853AThe UC2853A 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 UC2853A 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 63kHz 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.
The UC2853Ais identicalto the UC2853 except the internal oscillator fre-
quency has been reduced from 75kHzto 63kHz. The switching frequency loweredin orderto keep the second harmonicof the switching frequency
belowa 150kHz. For EMI specificationsat 150kHz this makesit easier for designto meet system requirements.
These devices are availablein 8-pin PDIP (P) and SOIC (D) packages. The
UC2853Ais specified for operation from –40°Cto 105°C.
High Power Factor Preregulator Complete 8-pin Power Factor
Solution Reduced External Components RMS Line Voltage Compensation Precision Multiplier/Squarer/Divider Internal 63kHz Synchronizable
Oscillator Average Current Mode PWM
Control Overvoltage Protection Comparator High Current, Clamped Gate Driver
BLOCK DIAGRAM
FEATURES DESCRIPTION
