Isolated Boost PFC Preregulator Controller

The UCC3857 provides all of the control functions necessary for an Iso- lated Boost PFC Converter. These converters have the advantage of trans- former isolation between primary and secondary, as well as an output bus voltage that is lower than the input voltage. By providing both power factor correction and down conversion in a single power processing stage, the UCC3857 is ideal for applications which require high efficiency, integration, and performance. The UCC3857 brings together the control functions and drivers necessary to generate overlapping drive signals for external IGBT switches, and pro- vides a separate output to drive an external Power MOSFET which pro- vides zero current switching (ZCS) for both the IGBTs Full programmability is provided for the MOSFET driver delay time with an external RC network. ZCS for the IGBT switches alleviates the undesirable turn off losses typi- cally associated with these devices. This allows for higher switching fre- quencies, smaller magnetic components and higher efficiency. The power factor correction (PFC) portion of the UCC3857 employs the familiar aver- age current control scheme used in previous Unitrode controllers. Internal circuitry changes, however, have simplified the design of the PFC section and improved performance. By Texas Instruments
UCC1857 's PackagesUCC1857 's pdf datasheet

UCC1857 Pinout, Pinouts
UCC1857 pinout,Pin out
This is one package pinout of UCC1857,If you need more pinouts please download UCC1857's pdf datasheet.

UCC1857 Application circuits
UCC1857 circuits
This is one application circuit of UCC1857,If you need more circuits,please download UCC1857's pdf datasheet.

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