Off-line Power Supply Controller
UCC1889 UCC2889 UCC3889
FEATURES
DESCRIPTION
• Transformerless Off-line
The UCC1889 controller is optimized for use as an off-line, low power, low
voltage,
Applications
regulated bias supply.
The unique circuit topology utilized in this device can be
• Ideal Primary-side Bias Supply visualized as two cascaded flyback converters, each operating in the discontinuous mode, and both driven from a single external power switch.
The significant
• Efficient Bi
CMOS Design
benefit of this approach is the ability to achieve
voltage conversion ratios of 400V
• Wide Input Range
to 12V with no transformer and low internal losses.
• Fixed or Adjustable Low Volt...