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UCC3819 - Power Factor Preregulator

General Description

The UCC2819/UCC3819 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.

Key Features

  • such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry and a leading-edge modulation technique to reduce ripple current in the bulk capacitor. The UCC3819 allows the output voltage to be programmed by bringing out the error amplifier noninverting input. Available in the 16-pin D, DW, N, and PW packages. block diagram VCC 15 OVP/EN 10 7.5 V.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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ą D Controls Boost Preregulator to Near-Unity Power Factor 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 10.8-V to 17-V Operation D Programmable Output Voltage (Tracking Boost Topology) UCC2819, UCC3819 PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR SLUS482B - APRIL 2001 − REVISED DECEMBER 2004 D, DW, N, and PW PACKAGES (TOP VIEW) GND PKLMT CAOUT CAI MOUT IAC VAOUT VFF 1 2 3 4 5 6 7 8 16 DRVOUT 15 VCC 14 CT 13 VAI 12 RT 11 VSENSE 10 OVP/EN 9 VREF description The UCC2819/UCC3819 provides all the functions necessary for active power factor corrected preregulators.