资 源 简 介
The UCC2819A/UCC3819A 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 UCC3819A offers new 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 UCC3819A allows the output voltage to be programmed by bringing out the error amplifier noninverting input..
