Non-isolated offline switcher has low standby power

Non-isolated offline switcher has low standby power

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By Nick Flaherty

Diodes has launched a universal AC high-voltage input non-isolated offline switcher chip with reduced standby power consumption.

The AP3928 addresses the challenges associated with using a bias power supply, and is optimized for situations where higher power levels are mandated, such as in industrial control or home automation systems, home appliances, and IoT devices.

The AP3928 has a 600mA maximum output current that allows for a 10W output power rating. A key differentiator of this high-voltage switcher IC is that it supports conventional offline non-isolated flyback configurations, as well as more streamlined non-isolated buck configurations, keeping the bill-of-materials BoM to a minimum.

The peak current and switching frequency will continuously reduce as the load decreases, meaning that this device can achieve heightened degrees of efficiency in light load conditions and so is well-suited for equipment that spends prolonged time in sleep mode. The low standby power of less than 30mW is of particular value in small domestic appliances and battery-powered IoT devices.

The switcher IC is supplied in a compact SO-8 package. To ensure safety, it meets high-voltage creepage requirements, and can support operational junction temperatures reaching up to +150°C. Overtemperature, output short, overload and open-loop protection functions are all included, as well as undervoltage lockout. The AP3928 is available at $0.25 in 1000 piece quantities.

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