UCC28880EVM-616: 13 or 5V @ 100mA, 85 ~ 265VAC in

The UCC28880EVM-616 evaluation module is an offline high-voltage buck-type power supply that provides 13 VDC at a maximum output of 100 mA. The input accepts a voltage range of 85 VAC to 265 VAC. The evaluation module also has the option to deliver 5-VDC output using a simple jumper arrangement for the purpose of quick demonstration (additional power-stage optimization needed for optimal 5-V output performance).

The evaluation module uses the UCC28880 low quiescent current switcher device. This device integrates a 700-V FET and controller into one SOIC7 package. The device also features a high-voltage current source, enabling start-up and operation directly from the rectified mains voltage. The low quiescent current of the device enables very high efficiency in non-isolated high-side buck low-power converters. Additional features are low standby power and a minimum number of external components.

The PWM signal generation is based on a maximum constant ON time concept and each ON pulse is followed 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 the power MOSFET through a driver. Thereby no internal clock is required, and the switching of the power MOSFET is load dependent. The device is also protected from failure conditions with thermal shutdown, under-voltage lockout, soft start and overload protection.