UCC1888 UCC2888 UCC3888 Off-line Power Supply Controller FEATURES • • • • • • • Transformerless Off-line Power Supply Wide 100VDC to 400VDC Allowable Input Range Fixed 5VDC or Adjustable Low Voltage Output DESCRIPTION The UCC3888 controller is optimized for use as an off-line, low power, low voltage, regulated bias supply.
The unique circuit topology utilized in this device can be visualized as two cascaded flyback converters, each operating in the discontinuous mode, both driven from a single external power switch.
The significant benefit of this approach is the ability to achieve voltage conversion ratios as high as 400V to 2.
7V with no transformer and low internal losses.
The control a...

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