BiCMOS PFC/PWM Combination Controller

The UCC18500 family provides all of the functions necessary for an ac- tive 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 con- version. The PFC stage is leading edge modulated while the second stage is trailing edge synchronized to allow for minimum overlap between the boost and PWM switches. This reduces ripple current in the bulk output capacitor. In order to operate with a three to one range of input line voltages, a line feedforward (VFF) in used to keep input power constant with vary- ing input voltage. Generation of VFF is done using IAC in conjunction with an external single pole Filter This not only reduces external parts count, but avoids the use of high voltage components offering a lower cost solution. The multiplier then divides the line current by the square of VFF. By Texas Instruments
UCC18500 's PackagesUCC18500 's pdf datasheet

UCC18500 Pinout, Pinouts
UCC18500 pinout,Pin out
This is one package pinout of UCC18500,If you need more pinouts please download UCC18500's pdf datasheet.

UCC18500 Application circuits
UCC18500 circuits
This is one application circuit of UCC18500,If you need more circuits,please download UCC18500's pdf datasheet.

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