UC2854DWTRG4 ,High Power Factor Preregulator 16-SOIC -40 to 85Support &Product Order Tools &TechnicalCommunityFolder Now Documents SoftwareUC1854,UC2854,UC3854SL ..
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UC2854DW-UC2854DWTR-UC2854DWTRG4-UC2854N
High Power Factor Preregulator
–2PKLMT
VREF
VSENSE
VREF
VCC
ENA
IAC
EMI
Filter
Line
Input
UC3854
VOUT
400 VDC
MULTOUT
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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
