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.