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Details, datasheet, quote on part number: UC3854
 
 
Part numberUC3854
CategoryAnalog & Mixed-Signal Processing => Power
TitlePower
DescriptionHigh Power Factor Preregulator
CompanyTexas Instruments, Inc.
DatasheetDownload UC3854 datasheet
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Specifications, Features, Applications

FEATURES

ˇ 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 fixedfrequency 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 UC1854'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 to 275 volts and line frequencies across the 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.

Supply Voltage VCC. GT Drv Current, Continuous. GT Drv Current, 50% Duty Cycle. Input Voltage, VSENSE, VRMS. Input Voltage, ISENSE, Mult Out. Input Voltage, PKLMT. Input Current, RSET, IAC , PKLMT, ENA. Power Dissipation. Storage Temperature. Lead Temperature (Soldering, 10 Seconds). +150oC. +300oC

Note 1: All voltages with respect to Gnd (Pin 1). Note 2: All currents are positive into the specified terminal. Note 3: ENA input is internally clamped to approximately 14V. Note 4: Consult Unitrode Integrated Circuits databook for information regarding thermal specifications and limita-

& SOIC-16 (Top View) & DW Packages & LCC-20 (Top View) & L Packages

N/C Gnd PKLMT CA Out ISENSE N/C Mult Out IAC VA Out VRMS N/C VREF ENA VSENSE RSET N/C SS CT VCC GT Drv

Unless otherwise stated, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V, ELECTRICAL CHARACTERISTICS VA Out=5V, VSENSE =7.5V, no load on SS, CA Out, VA Out, REF, GT Drv, ­55oC

PARAMETER OVERALL Supply Current, Off Supply Current, On VCC Turn-On Threshold VCC Turn-Off Threshold ENA Threshold, Rising ENA Threshold Hysteresis ENA Input Current VRMS Input Current

VOLTAGE AMPLIFIER Voltage Amp Offset Voltage VA Out=5V VSENSE Bias Current Voltage Amp Gain Voltage Amp Output Swing Voltage Amp Short Circuit Current Out=0V SS Current SS=2.5V

Unless otherwise stated, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V, ELECTRICAL VRMS VSENSE=7.5V, no load on SS, CA Out, CHARACTERISTICS VA Out, REF, GT Drv, ­55oC Multiplier Gain Constant OSCILLATOR Oscillator Frequency

CT Ramp Peak-to-Valley Amplitude CT Ramp Valley Voltage GATE DRIVER Maximum GT Drv Output Voltage 0mA load on GT Drv, 18V



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