UC2854ADWTRG4 ,Enhanced High Power Factor Preregulator 16-SOIC -40 to 85SLUS329E–MONTH 2003–REVISED JANUARY 2008RECOMMENDED OPERATING CONDITIONSover operating free-air tem ..
UC2854AN ,Enhanced High Power Factor PreregulatorSLUS329E–MONTH 2003–REVISED JANUARY 2008RECOMMENDED OPERATING CONDITIONSover operating free-air tem ..
UC2854BDW ,Enhanced High Power Factor PreregulatorSLUS329E–MONTH 2003–REVISED JANUARY 2008RECOMMENDED OPERATING CONDITIONSover operating free-air tem ..
UC2854BDWG4 ,Enhanced High Power Factor Preregulator 16-SOIC -40 to 85FEATURESDESCRIPTION• Controls Boost PWM to Near-Unity PowerFactorThe UC3854A/B products are pin com ..
UC2854BDWTR ,Enhanced High Power Factor PreregulatorSLUS329E–MONTH 2003–REVISED JANUARY 2008These devices have limited built-in ESD protection. The lea ..
UC2854BDWTRG4 ,Enhanced High Power Factor Preregulatormaximum ratings may cause permanent damage to the device. These are stress ratingsonly, and functio ..
UM66T19L , MELODY INTEGRATED CIRCUIT
UM66T19L , MELODY INTEGRATED CIRCUIT
UM6845EA , CRT Controller
UM6K1 N TN , 2.5V Drive NchNch MOS FET
UM6K1 N , Small switching (30V, 0.1A)
UM6K1N , Small switching (30V, 0.1A)
UC2854ADW-UC2854ADWG4-UC2854ADWTRG4-UC2854AN
Enhanced High Power Factor Preregulator
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E–MONTH 2003–REVISED JANUARY 2008 ADVANCED HIGH-POWER FACTOR PREREGULATOR 1 FEATURES DESCRIPTION • Controls Boost PWM to Near-Unity Power Factor The UC3854A/B products are pin compatible • Limits Line Current Distortion To <3% enhanced versions of the UC3854. Like the UC3854, these products provide all of the functions necessary • World-Wide Operation Without Switches for active power factor corrected preregulators. The • Accurate Power Limiting controller achieves near unity power factor by • Fixed-Frequency Average Current-Mode shaping the ac input line current waveform to correspond to the ac input line voltage. To do this the Control UC3854A/B uses average current mode control. • High Bandwidth (5 MHz), Low-Offset Current Average current mode control maintains stable, low Amplifier distortion sinusoidal line current without the need for • Integrated Current- and Voltage-Amplifier slope compensation, unlike peak current mode Output Clamps control. • Multiplier Improvements: Linearity, 500 mV V AC A 1%, 7.5-V reference, fixed frequency oscillator, Offset (Eliminates External Resistor), 0 V to PWM, voltage amplifierwith soft-start, line voltage 5 V Multout Common-Mode Range feedforward (V squarer), input supply voltage RMS clamp, and over current comparator round out the lilst • V GOOD Comparator REF of feataures. • Faster and Improved Accuracy ENABLE Comparator Available in the 16-pin N (PDIP), DW (SOIC Wide), and J (CDIP) and 20-pin Q (PLCC) package. See • UVLO Options (16 V/10 V or 10.5 V/10 V) Ordering Information table for availability by • 300-μA Start-Up Supply Current temperature range. BLOCK DIAGRAM VAO MOUT CAO PKLMT REF 7 5 3 2 9 V CC 7.5 V REF (A) 16 V / 10 V RUN (B) 10.5 V / 10 V 10 ENA 7.1 V IC 2.65 V / 2.15 V POWER 3 V 15 VCC A 11 VSENSE R 6 B R IAC 16 GTDRV S Q 2 8 X C VRMS RUN 14 μA 20 V 13 A B SS I MOUT OSC 1 GND C 4 14 12 ISENSE CT RSET 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2003–2008, Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
