UCC38503DW Texas Instruments - Yeehing Electronics

PFC/PWM Combination controller with 10.5V/10V VCC UVLO and 6.75V/3.75V PWM UVLO, 0°C to 70°C

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The UCC2850x family provides all of the control functions necessary for an active power-factor-corrected preregulator and a second-stage dc-to-dc converter. The controller achieves near-unity power factor by shaping the ac input line current waveform to correspond to the ac input-line voltage using average current-mode control. The dc-to-dc converter uses peak current-mode control to perform the step-down power conversion.