It has an internal 700V mosfet and works with mains from 85Vac to 300Vac, and typically with peak current up to 1.1A.
“A key differentiator of this switcher IC is that it supports conventional off-line non-isolated fly-back configurations, as well as more streamlined non-isolated buck configurations,” according to the company. “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. It is thereby suited for any form of equipment that spends prolonged time in sleep mode.”
Called AP3928, it comes in an SO-8 package.
“Creepage is very important because the drain pins will be sitting at up to 350 volts, while the ground and other pins will be around 12V,” Diodes told Electronics Weekly. “On this particular device, all the high voltage pins are positioned on one side of the package, while the low voltage pins are placed on the other side. This means that most creepage concerns will be automatically mitigated.
It manages its own Vcc by turning on and off an internal regulator. A modified arrangement, where an auxiliary Vcc supply is implemented (left), can cut no-load power to 30mW.
Over-temperature, output short, over-load and open-loop protection is included, as well as under-voltage lock-out. It can operate at junction temperatures up to +150°C.
