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Description
HIgh Power Factor Preregulator
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FEATURES
● Control Boost PWM to 0.99 Power Factor
● Limit Line Current Distortion To <5%
● World-Wide Operation Without Switches
● Feed-Forward Line Regulation
● Average Current-Mode Control
● Low Noise Sensitivity
● Low Start-Up Supply Current
● Fixed-Frequency PWM Drive
● Low-Offset Analog Multiplier/Divider
● 1A Totem-Pole Gate Driver
● Precision Voltage Reference
DESCRIPTION
The UC1854 provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC1854 contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector, and over-current comparator.
The UC1854 uses average current-mode control to accomplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.
The UC1 854's high reference voltage and high oscillator amplitude minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200kHz. The UC1854 can be used in single and three phase systems with line voltages that vary from 75 to 275 volts and line frequencies across the 50Hz to 400Hz range. To reduce the burden on the circuitry that supplies power to this device, the UC1854 features low starting supply current.
These devices are available packaged in 16-pin plastic and ceramic dual in-line packages, and a variety of surface-mount packages.
Preview of the first 3 pages of the data sheet
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11 buyer reviews from Singapore
Jessica Ross
Length of registration:7 years
The testing result for the Intergrated Circuits UC3854DW ordered from Utsource website was satisfactory. The device was tested for its functionality and all the tests were successful. The device was found to be in good working condition and was able to perform all its intended functions. The device was also tested for its electrical parameters and all the tests were within the specified limits. Th
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03/17/2023
Arian ZIKE
Length of registration:9 years
Very satisfied with
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06/06/2021
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Warranty
All UTSOURCE purchases have a 60 days money back return policy, plus a 90 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
UC3854DW
UC3854DW has several brands around the world that may have alternate names for UC3854DW due to regional differences or acquisition. UC3854DW may also be known as the following names:
BUYING OPTIONS
Stock Status: 10000
Minimum: 2
Total Price:
Unit Price:1.71559
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Stop production experts, we can provide a large number of electronic components that have been stopped production and are difficult to find, to facilitate the maintenance company
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