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UCC3817APW Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3817APW Datasheet(HTML) 1 Page - Texas Instruments |
1 / 31 page UCC2817A, UCC2818A UCC3817A, UCC3818A SLUS577C − SEPTEMBER, 2003 − REVISED MARCH 2009 BiCMOS POWER FACTOR PREREGULATOR 1 www.ti.com FEATURES D Controls Boost Preregulator to Near-Unity Power Factor D Limits Line Distortion D World Wide Line Operation D Over-Voltage Protection D Accurate Power Limiting D Average Current Mode Control D Improved Noise Immunity D Improved Feed-Forward Line Regulation D Leading Edge Modulation D 150-µA Typical Start-Up Current D Low-Power BiCMOS Operation D 12-V to 17-V Operation D Frequency Range of 6 kHz to 220 kHz DESCRIPTION The UCC3817A and the UCC3818A family provides all 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 that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current. Designed in Texas Instrument’s BiCMOS process, the UCC3817A/UCC3818A offers new features such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset ( ±2 mV) current amplifier to reduce distortion at light load conditions. BLOCK DIAGRAM UDG-03122 VREF 9 2 16 1 15 10 5 4 DRVOUT GND CAI VCC OVP/EN VAOUT 1.9 V PKLMT 7.5 V REFERENCE UVLO 16 V/10 V (UCC3817A) 10.5 V/10 V (UCC3818A) VCC 3 OSCILLATOR 12 RT 14 CT SQ R PWM LATCH + − PWM CAOUT + − + − + − SS VOLTAGE ERROR AMP 8.0 V 13 7 11 VSENSE VFF 8 IAC 6 MOUT MIRROR 2:1 X2 + − 7.5 V ENABLE OVP ÷ X X MULT OSC CLK CLK CURRENT AMP 16 V (FOR UCC3817A ONLY) + − 0.33 V ZERO POWER R + − 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 2006 − 2009, Texas Instruments Incorporated 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. |
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