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
Designed in Texas Instruments 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
The UCC3819A is directly pin for pin compatible with the UCC3819. Only the output stage of UCC3819A has
been modified to allow use of a smaller external gate drive resistor values. For some power supply designs
where an adequately high enough gate drive resistor can not be used, the UCC3819A offers a more robust
output stage at the cost of increasing the internal gate resistances. The gate drive of the UCC3819A remains
strong at ±1.2 A of peak current capability.
Available in the 16-pin D, N, and PW packages.
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