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UCC38500 Datasheet Bicmos Pfc/pwm Combination Controller

Manufacturer: Texas Instruments

Overview: UCC28500, UCC28501, UCC28502, UCC28503 UCC38500, UCC38501, UCC38502, UCC38503 SLUS419C − AUGUST 1999 − REVISED NOVEMBER 2001 BiCMOS PFC/PWM COMBINATION.

General Description

The UCC2850x family provides all of the control functions necessary for an active power-factorcorrected 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.

Key Features

  • D Combines PFC and Downstream Converter Controls D Controls Boost Preregulator to Near-Unity Power Factor D Accurate Power Limiting D Improved Feedforward Line Regulation D Peak Current-Mode Control in Second Stage D Programmable Oscillator D Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple D Low Start-up Supply Current D Synchronized Second Stage Start-Up, with Programmable Soft-start D Programmable Second Stage Shutdown.

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