700-V switcher halves quiescent power consumption
‘The UCC28880 controller integrates a 700-V power MOSFET and high-voltage current source, increasing overall energy efficiency of ‘always-on’ non-isolated power systems with output currents up to 100 mA, such as smart meters, home automation equipment and white goods.
The UCC28880 high-voltage switcher reduces system cost and minimizes the overall size of the power supply, while maintaining high efficiency and system performance. Designers can use the switcher to build different converter topologies, such as buck, buck-boost and flyback, without adding extra semiconductor components.
The UCC28880 claims the industry’s lowest power consumption because the load is reduced, the quiescent current is reduced to below 100-uA.
The circuit integrates a 700-V MOSFET, start-up current source and internal current sensing in a 7-pin SO package size of 29.4 mm2. Additionally, no external compensation is needed which further reduces component count and board space. Along with current limit function, the controller’s inductor current runaway protection helps protect against under load short-circuit conditions to ensure design reliability.
The device provides over-temperature protection with hysteretic re-start for safe operation. High-voltage pins are segregated to one side of the package, which maximizes separation between low and high voltage pins.
An offline, AC/DC reference design based on the UCC28880 (PMP8550) enables designers to quickly design a low-cost, low-power non-isolated high-side buck converter with a total solution size of 38mm by 32mm by 22mm that supports 13 V, while generating up to 100 mA of output current. The reference design features a buck converter with integrated switch and can be used in numerous industrial applications. The design’s schematic, CAD files and test results are available for download.
Availability and Pricing
The UCC28880 switcher with integrated 700-V FET is available now in a 7-pin SOIC package and priced at $0.55 in 1,000-unit quantities. The UCC28880 low-side buck evaluation module (EVM) and high-side buck EVM are priced at $49 and include a downloadable PSpice model.