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UC1854A Datasheet(PDF) 1 Page - Texas Instruments |
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UC1854A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 18 page 1 FEATURES DESCRIPTION BLOCK DIAGRAM 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 S Q 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 UC1854A UC2854A, UC2854B UC3854A, UC3854B SLUS329E – MONTH 2003 – REVISED JANUARY 2008 www.ti.com ADVANCED HIGH-POWER FACTOR PREREGULATOR • Controls Boost PWM to Near-Unity Power Factor The UC3854A/B products are pin compatible enhanced versions of the UC3854. Like the UC3854, • Limits Line Current Distortion To <3% 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 (VRMS squarer), input supply voltage clamp, and over current comparator round out the lilst • V REF GOOD Comparator 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. 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, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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Descripción similar - UC1854A_15 |
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