1 Features
1• Integrated 14-Ω, 700-V Power MOSFET
• Integrated High-Voltage Current Source for
Internal Device Bias Power
• Integrated Current Sense
• Internal Soft Start
• Self-Biased Switcher (Start Up and Operation
Directly from Rectified Mains Voltage)
• Supports Buck, Buck-Boost and Flyback
Topologies
• <100-μA Device Quiescent Current
• Robust Current Protection During Load Short
Circuit
• Protection
– Current Limit
– Overload and Output Short Circuit
– Over Temperature

2 Applications
• AC-to-DC Power Supplies
(Non-Isolated Buck Converter with Output Current
up to 225 mA for CCM;
150 mA for DCM)
• E-Meter, Home Automation SMPS
• Bias Power for MCU, RF and IoT Enabled
Devices
• Appliances, White Goods and LED Drivers

3 Description
The UCC28881 integrates the controller and a 14-Ω,
700-V power MOSFET into one monolithic device. The device also integrates a high-voltage current
source, enabling start up and operation directly from
the rectified mains voltage. UCC28881 is the same
family device of UCC28880, with higher current
handling capability.
The low quiescent current of the device enables
excellent efficiency. With the UCC28881 the most
common converter topologies, such as buck, buck- boost and flyback can be built using a minimum
number of external components.
The UCC28881 incorporates a soft-start feature for
controlled start up of the power stage which
minimizes the stress on the power-stage
components.