Log in
Register
Details, datasheet, quote on part number: UC3854
PartUC3854
CategoryAnalog & Mixed-Signal Processing => Power
TitlePower
DescriptionHigh Power Factor Preregulator
CompanyTexas Instruments, Inc.
DatasheetDownload UC3854 datasheet
Cross ref.Similar parts: UCC2857Q, UCC2858DW, UCC3857Q, UCC3858DW, MC33368P, MC33368PG, UC2854ADW, UC2854AJ, UC2854AN, UC2854BDW
Quote
Find where to buy
 
 

 

Features, Applications

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 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<TA<125oC for the UC1854, ­40oC<TA<85oC for the UC2854, and 0oC<TA <70oC for the UC3854, and TA=TJ. TEST CONDITIONS ENA=0V MIN TYP MAX

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<T <125oC for the ­40oC<T <85oC for the UC2854, and A 0oC<TA<70oC for the UC3854, and TA=TJ. PARAMETER CURRENT AMPLIFIER Current Amp Offset Voltage ISENSE Bias Current Input Range, ISENSE, Mult Out Current Amp Gain Current Amp Output Swing Current Amp Short Circuit Current Amp Gain-BW Product REFERENCE Reference Output Voltage VREF Load Regulation VREF Line Regulation VREF Short Circuit Current MULTIPLIER Mult Out Current IAC Limited Mult Out Current Zero Mult Out Current RSET Limited Mult Out Current TEST CONDITIONS MIN Out=0V TA=25oC (Note TA=25oC IREF=0mA, Over Temp. VRMS=1V, VA Out VRMS=1V, VA=2V (Note RSET=8.2k to TYP MAX 4 500 UNITS V mA kHz ľA V kHz ľA ns

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<VCC<35V GT Drv Output Voltage High GT Drv Output Voltage Low, Off GT Drv Output Voltage Low Peak GT Drv Current GT Drv Rise/Fall Time GT Drv Maximum Duty Cycle CURRENT LIMIT PKLMT Offset Voltage PKLMT Input Current PKLMT to GT Drv Delay ­200mA load on GT Drv, VCC=0V, 50mA load on GT Drv 200mA load on GT Drv 10mA load on GT Drv 10nF from GT Drv to Gnd 1nF from GT Drv to Gnd VCA Out=7V


Some Part number from the same manufacture Texas Instruments, Inc.
UC3854A Enhanced High Power Factor Preregulator
UC3854ADW ti UC3854A, Enhanced High Power Factor Preregulator
UC3854B Enhanced High Power Factor Preregulator
UC3854BDW ti UC3854B, Enhanced High Power Factor Preregulator
UC3854DW ti UC3854, High Power Factor Preregulator
UC3855A High Performance Power Factor Preregulator
UC3855ADW ti UC3855A, High Performance Power Factor Preregulator
UC3855B High Performance Power Factor Preregulator
UC3855BDW ti UC3855B, High Performance Power Factor Preregulator
UC3856 Improved Current Mode PWM Controller
UC3856DW ti UC3856, Improved Current Mode PWM Controller
UC385T-1 3 - Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-1 ti UC385-1, Fast Transient Response 5 Ampere Low Dropout Regulator
UC385T-2 3 - Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-2 ti UC385-2, Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-3 3 - Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-3 ti UC385-3, Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-ADJ 3 - Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385T-ADJ ti UC385-ADJ, Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385TD-1 3 - Fast Transient Response 5 Ampere Low Dropout (LDO) Regulator
UC385TD-1 ti UC385-1, Fast Transient Response 5 Ampere Low Dropout Regulator
 
0-C     D-L     M-R     S-Z