UC3854DWG4 ,High Power Factor PreregulatorFeatures... 19 Application and Implementation...... 122 Applications..... 19.1 Application Informat ..
UC3854DWTR ,High Power Factor PreregulatorFeaturescompatible gate driver, 7.5-V reference, line1• Control Boost PWM to 0.99 Power Factorantic ..
UC3854DWTR-FG4 ,High Power Factor PreregulatorMaximum Ratings.. 512 Device and Documentation Support........ 187.2 ESD Ratings........ 512.1 Docu ..
UC3854DWTRG4 ,High Power Factor PreregulatorElectrical Characteristics....... 612.4 Community Resources...... 187.6 Typical Characteristics. 81 ..
UC3854J , High Power Factor Preregulator
UC3854N ,High Power Factor PreregulatorMaximum Ratings.. 512 Device and Documentation Support........ 187.2 ESD Ratings........ 512.1 Docu ..
UN511N ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN511T ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN511V ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN5154 ,Composite DeviceAbsolute Maximum Ratings T = 25°Ca1: BaseParameter Symbol Rating Unit2: Emitter3: CollectorCollect ..
UN5210 ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN5211 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UC3854DW-UC3854DWG4-UC3854DWTR-UC3854DWTR-FG4-UC3854DWTRG4-UC3854N-UC3854NG4-UC3854Q-UC3854QTR
High Power Factor Preregulator
–2PKLMT
VREF
VSENSE
VREF
VCC
ENA
IAC
EMI
Filter
Line
Input
UC3854
VOUT
400 VDC
MULTOUT
Tools &
Software
Support &
Community
UC1854, UC2854, UC3854SLUS336A –JUNE 1998–REVISED DECEMBER 2016 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
Applications Offline AC-to-DC Converters Medical, Industrial, Telecom, andIT Power
Supplies Uninterruptible Power Supplies (UPS) Appliances and White Goods
DescriptionThe UC1854 provides active-power factor correction
for power systems that otherwise would draw non-
sinusoidal current from sinusoidal power lines. This
device implementsall the control functions necessary builda power supply capableof optimally using
available power-line current while minimizing line-
current distortion. To do this, the UC1854 containsa
voltage amplifier, an analog multiplier and divider,a
current amplifier, anda fixed-frequency PWM.
and with minimal response
The high reference high oscillator
amplitudeof the noise sensitivity
while fast PWM elements permit chopping
frequencies above 200 kHz. The UC1854is usedin
single-phase and three-phase systems with line
voltages that vary from 75Vto 275V and line
frequencies across the 50-Hzto 400-Hz range. To
reduce the burdenon the circuitry that supplies power this device, the UC1854 features low starting
supply current.
These devices are available packaged in 16-pin
plastic and ceramic dual in-line packages, anda
varietyof surface-mount packages.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Block Diagram
