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2022-09-24 23:33:15
UC2854A - Advanced High Power Factor Preregulator
The UC3854A/B products are pin-compatible enhanced versions of the UC3854. Like the UC3854, these products provide all the functions required for active power factor correction preregulators. The controller achieves near unity, shaping the AC input power factor corresponding to the AC line current waveform input voltage. To do this the UC3854A/B uses average current mode control. Average current mode control maintains stable, low distortion sinusoidal current without the need for slope compensation, unlike peak current mode control. 1%, 7.5 V reference voltage, fixed frequency oscillator, PWM, with soft start, voltage line voltage amplifier feedforward (VRMS squared), input supply voltage clamp, and more than the current comparison round feature list. Available in 16-pin N (PDIP), DW (SOICWide), and J (CDIP) and 20-pin Q (PLCC) packages. See temperature range availability for ordering information on page 3. ...