Buck switchers support always-on operation for IoT endpoints

Non-isolated buck switchers from Diodes meet demand for direct, non-isolated AC/DC conversion in a small form factor for always-on appliances and IoT endpoints.

The AP3917 family of universal AC/DC, non-isolated buck (step-down) power switchers are intended for low-power applications, such as small appliances and IoT endpoints powered by an offline supply. The family is made up of the AP3917B (170mA nominal load), the AP3917C (270mA) and the AP3917D (370mA).

Efficient, direct, non-isolated AC/DC conversion in a small form factor, with low standby current, is increasing being specified for small household, office, and industrial appliances operating as standalone devices or as part of the IoT.

The AP3917 family of buck switchers provides efficient, offline power conversion for light-load applications. Discontinuous and continuous conduction modes are both supported.

The AP3917 buck switcher can convert a full-wave rectified, AC input voltage between 85 and 265V AC to a nominal 8.0V DC output. Its non-isolated design does not require an external transformer and very few external components, saving space and bill of materials cost.

No-load power consumption is less than 30mW, making the AP3917 buck switchers particularly suitable for small appliances that operate in standby mode for prolonged periods when connected to an AC outlet, observes Diodes.

The AP3917BS7-13 is supplied in a surface-mount SO-7 package.

Diodes manufactures and supplies application-specific standard products for the broad discrete, logic, analogue and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets, supplying a product range that includes diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC/DC converters and controllers, DC/DC switching and linear voltage regulators and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. It also has timing, connectivity, switching, and signal integrity solutions for high-speed signals.


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