STMicroelectronics VIPer11 offline converters

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The VIPer11 offline converter with embedded 800 V avalanche-rugged MOSFET enables equipment makers to design tough auxiliary power supplies and power adapters. Its 26 VDC drain-start voltage allows an ultrawide line input voltage range and it enhances flexibility in numerous consumer and industrial applications.

The logic-level primary MOSFET enables the product to operate with a wide supply voltage range, from 4.5 up to 30 V, allowing the design of efficient 5 V output SMPS. This is in addition to features like an integrated high-voltage start-up, an error amplifier and a jittered oscillator that reduces EMI, simplifying design and saving space.

The 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. High efficiency is assured across a wide load range, even at 5 V output voltage, due to the logic-level MOSFET feature, and minimum consumption of 10 mW enables low standby power.

Capable of supporting typical maximum rating of 12 W in an open-frame SMPS or 10 W in an enclosed adapter, the converter addresses a variety of domestic appliances and consumer products, building-automation equipment, small industrial machinery, lighting, smart meters and motion controls. Users also leverage support from development tools including evaluation kits, application notes, spice models and the eDesign simulation tool.

In addition to the extensive integrated power-supply control functions, the HV converter contains comprehensive built-in protection features including overload/short-circuit protection, line or output overvoltage protection, 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 series contains the VIPer114 with drain-current limit (I_DLIM) of 480 mA and the VIPer115 limited at 590 mA, with a choice of 30 or 60 kHz operating frequency.

For more information: www.st.com/viperplus.