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UC2854BQ Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2854BQ Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 16 page UC1854B UC2854A, UC2854B UC3854A, UC3854B SLUS329B − JUNE 1998 − REVISED FEBRUARY 2005 ADVANCED HIGHPOWER FACTOR PREREGULATOR 1 www.ti.com FEATURES D Controls Boost PWM to Near-Unity Power Factor D Limits Line Current Distortion To < 3% D World-Wide Operation Without Switches D Accurate Power Limiting D Fixed-Frequency Average Current-Mode Control D High Bandwidth (5 MHz), Low-Offset Current Amplifier D Integrated Current- and Voltage Amplifier Output Clamps D Multiplier Improvements: Linearity, 500 mV VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range D VREF GOOD Comparator D Faster and Improved Accuracy ENABLE Comparator D UVLO Options (16 V/10 V or 10.5 V/10 V) D 300-µA Start-Up Supply Current BLOCK DIAGRAM DESCRIPTION The UC3854A/B products are pin compatible enhanced versions of the UC3854. Like the UC3854, these products provide all of the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the AC input line current waveform to correspond to the AC input line voltage. To do this the UC3854A/B uses average current mode control. Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control. A 1% 7.5 V reference, fixed frequency oscillator, PWM, voltage amplifier with soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, and over current comparator round out the list of features. Available in the 16-pin N (PDIP), DW (SOIC- Wide), and J (CDIP) and 20-pin Q (PLCC) package. See ordering information on page 3 for availability by temperature range. UDG−03110 10 11 6 8 15 1 16 ENA VSENSE IAC VRMS VCC GND GTDRV 2.65 V / 2.15 V 3 V 7 VAO 13 SS X2 A B C (A) 16 V / 10 V (B) 10.5 V / 10 V 5 MOUT 4 ISENSE 3 CAO 14 CT OSC 12 RSET SQ R R 2 PKLMT 20 V IC POWER 7.5 V REF 9 REF RUN 7.1 V RUN VCC 14 µA I MOUT + A B C PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2003, Texas Instruments Incorporated |
Numéro de pièce similaire - UC2854BQ |
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Description similaire - UC2854BQ |
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