Off-line Power Supply Controller

The UCC1889 controller UCC1889 UCC2889 UCC3889 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, and both driven from a single external power Switch The significant benefit of this approach is the ability to achieve voltage conversion ratios of 400V to 12V with no transformer and low internal losses. The control algorithm utilized by the UCC1889 is to force the Switch on time to be inversely proportional to the input line voltage while the Switch off time is made in- versely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded configuration allows a volt - age conversion from 400V to 12V to be achieved with a Switch duty cycle greater than 10%. This topology also offers inherent short Circuit Protection since as the output voltage falls to zero, the Switch off time approaches infinity. By Texas Instruments
UCC1889 's PackagesUCC1889 's pdf datasheet



UCC1889 Pinout, Pinouts
UCC1889 pinout,Pin out
This is one package pinout of UCC1889,If you need more pinouts please download UCC1889's pdf datasheet.

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