Off-line Power Supply Controller

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 discontinu- ous 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 algorithm utilized by the UCC3888 sets the Switch on time inversely proportional to the input line voltage and sets the Switch off time inversely propor- tional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded configuration allows a voltage conver- sion from 400V to 2.7V to be achieved with a Switch duty cycle of 7.6%. This topol- ogy also offers inherent short Circuit Protection since as the output voltage falls to zero, the Switch off time approaches infinity. The output voltage is set internally to 5V. It CAN be programmed for other output voltages with two external resistors. An isolated version CAN be achieved with this topology as described further in Unitrode Application Note U-149. By Texas Instruments
UCC1888 's PackagesUCC1888 's pdf datasheet

UCC1888 Pinout, Pinouts
UCC1888 pinout,Pin out
This is one package pinout of UCC1888,If you need more pinouts please download UCC1888's pdf datasheet.

UCC1888 Application circuits
UCC1888 circuits
This is one application circuit of UCC1888,If you need more circuits,please download UCC1888's pdf datasheet.

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