Texas Instruments UCC28881

Description

The EVM uses the UCC28881 low quiescent current switcher device. This device integrates a 700-V FETand controller into one SOIC7 package. The device also features a high-voltage current source, enablingstart-up and operation directly from the rectified mains voltage. The low quiescent current of the deviceenables very high efficiency in non-isolated high-side buck low-power converter.The PWM signal generation is based on a maximum constant ON time concept and each ON pulse isfollowed by a minimum OFF time to ensure the power MOSFET is not continuously driven in the ON state.The PWM signal is AND gated with the signal from a current limiter. The AND gated signal controls thepower MOSFET through a driver. Thereby no internal clock is required, and the switching of the powerMOSFET is load dependent. The device is also protected from failure conditions with thermal shutdown,under-voltage lockout, soft start and overload protection. Please refer to the UCC28881, (SLUSC05), datasheet for details.

Features

The UCC28881EVM-680 features include:

• Single13-V Output
• No Load to 225-mA Load Range
• Universal Off-Line Input Voltage Range
• Overload and Output Short-Circuit Protection
• Controlled Start Up and Restart After Fault Protection

Typical applications

• E Metering, Infrastructure
• LED Lighting
• Home Appliances, White Goods, Home Automation

More information

• Datasheet
• IC product information