Electronic Design

SMPS Converters Save Energy In Domestic Applications

The VIPerPlus family of off-line switched-mode power-supply (SMPS) converters from STMicroelectronics minimizes standby power consumption and the number of external components required while enabling easy compliance with Blue Angel, Energy Star, and other low-power norms and directives, according to the company.

These converters operate from all mains voltages worldwide in home appliances like coffee makers and dishwashers, consumer equipment such as LCD TVs and set-top boxes, domestic and architectural lighting, auxiliary supplies for desktop PCs and servers, and chargers for mobile phones, digital cameras, portable audio players, and cordless appliances.

All of the VIPerPlus devices include the controller, the startup circuitry, and an 800-V avalanche-rugged power MOSFET. Integrated functions and high breakdown voltage improve their robustness and reliability, reduce external component count, and provide higher efficiency in operating mode and standby mode, which consumers less than 50 mW at 265 V and can be reduced to 30 mW with an optimized transformer design.

The MOSFET is specifically optimized for the VIPerPlus. The fixed-frequency pulse-width modulation (PWM) controller with jittering and the quasi-resonant innovative topology maximize the operating mode’s efficiency while reducing the electromagnetic interference (EMI) filter costs.

With its best-in-class standby power, customers can meet the most demanding energy-saving regulations (Energy Star; 80+ Bronze, Silver, Gold). Its protection features include accurate, adjustable over-voltage and overload protection, hysteretic over-temperature protection, two levels of over-current protection, and open-loop failure disconnection.

By integrating a high-voltage startup-current generator as well as essential drain-current control during the converter startup phase, VIPerPlus eliminates the need for a startup resistor, reduces stress on the secondary diode, and helps prevent transformer saturation. The embedded SenseFET eliminates external sensing components, allowing a precise drain-current limit. Fault detection initiates the auto-restart function, preventing damage to the power supply or load.

Available now in volume quantities in DIP-7 or SO16N packages, the VIPerPlus family costs $0.37 to $0.60 each in quantities of 10,000 units.



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