Off-line converters toughen up for auxilliary power supplies

Equipment makers are able to design tougher auxiliary power supplies and power adapters, using the VIPer11 off-line converter with embedded 800V avalanche-rugged MOSFET, says STMicroelectronics. Its 26V DC drain-start voltage allows a wide line input voltage range for flexible design in a variety of consumer and industrial applications, adds the company.

The logic-level primary MOSFET enables the VIPer11 to operate with a wide supply voltage range (4.5 to 30V), allowing the design of highly efficient 5V output switch mode power supplies. This efficiency, combined with features such as an integrated high-voltage start-up, an error amplifier, and a jittered oscillator that reduces EMI, simplify design, save space and bill of material costs, says STMicroelectronics.

VIPer11 high-voltage converters enable flyback, boost, or buck/boost power supplies powered directly from the rectified AC line or other DC sources to generate the desired output voltage using a simple voltage divider. The logic-level MOSFET combines with what is claimed to be industry-leading minimum consumption of 10mW for low standby power.

Capable of supporting typical maximum rating of 12W in an open-frame switch mode power supply, or 10W in an enclosed adapter, the VIPer11 addresses a variety of domestic appliances and consumer products, building-automation equipment, small industrial machinery, lighting, smart meters, and motion controls. ST also offers support in the form of development tools including evaluation kits, application notes, spice models and eDesign simulation tool that help evaluate the innovative VIPer11 features.

In addition to the extensive integrated power-supply control functions, the HV converter contains comprehensive built-in protection features including overload/short-circuit protection (OLP), line or output over-voltage protection (OVP), maximum duty-cycle counter, and VCC clamping, all with automatic restart. There is also embedded thermal shutdown, built-in soft‑start and pulse-skip protection to avoid flux-runaway and enhance system reliability.

The VIPer11 series contains the VIPer114 with drain-current limit (IDLIM) of 480mA, and the VIPer115 limited at 590mA, and a choice of 30 or 60kHz operating frequency.

The devices are in mass production now, packaged as SSOP10 power devices.

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