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UCC3857N Datasheet

  • UCC3857N

  • IC-PFC PRE-REGULATOR

  • 9頁

  • ETC

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UCC1857
UCC2857
UCC3857
Isolated Boost PFC Preregulator Controller
FEATURES
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PFC With Isolation, VO < VIN
Single Power Stage
Zero Current Switched IGBT
Programmable ZCS Time
Corrects PF to >0.99
Fixed Frequency, Average
Current Control
Improved RMS Feedforward
Soft Start
9V to 18V Supply V Range
20-Pin DW, N, J, and Q
Packages
PRELIMINARY
DESCRIPTION
The UCC3857 provides all of the control functions necessary for an Isolated
Boost PFC Converter. These converters have the advantage of transformer
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 provides a
separate output to drive an external power MOSFET which provides zero cur-
rent 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 typically associated with
these devices. This allows for higher switching frequencies, smaller magnetic
components and higher efficiency. The power factor correction (PFC) portion of
the UCC3857 employs the familiar average current control scheme used in
previous Unitrode controllers. Internal circuitry changes, however, have simpli-
fied the design of the PFC section and improved performance.
Controller improvements include an internal 6 bit A-D converter for RMS input
line voltage detection, a zero load power circuit, and significantly lower quies-
cent operating current. The A-D converter eliminates an external 2 pole low
pass filter for RMS detection.
BLOCK DIAGRAM
(continued)
UDG-96134
1/98

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