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The UCC2819A/UCC3819A provides all the functions necessary for an active power factor correction preregulator. The controller realizes that by shaping the AC input current waveform, corresponding to the AC input line voltage, the power factor is close. Average current mode control maintains stable, low-distortion sinusoidal line current.
Designed in Texas Instruments' BiCMOS process, the UCC3819A offers new features such as low start-up current, reduced power consumption, overvoltage protection, undervoltage lockout detection circuitry and paralleling a leading modulation technique to reduce ripple current for bulk capacitors.
The UCC3819A allows the output voltage to be programmed at the noninverting input of the error amplifier.