AC-DC converters for always on appliances in the IoT

August 14, 2019 //By Nick Flaherty
Diodes' AP3917 family of universal AC-DC converters with non-isolated buck (step-down) power switches is aimed at low-power always on applications such as small appliances and IoT endpoints
Diodes' AP3917 family of universal AC-DC converters with non-isolated buck (step-down) power switches is aimed at low-power always on applications such as small appliances and IoT endpoints

Diodes has launched a family of universal AC-DC, non-isolated buck step-down power switchers for low-power always on applications. Members of the family members include the AP3917B with a 170mA nominal load, AP3917C with 270mA and AP3917D at 370mA.

The need for direct, non-isolated AC-DC conversion in a small form factor, with high levels of efficiency and low standby current, is increasing due to the proliferation of small household, office, and industrial appliances that operate as standalone devices or as part of the Internet of Things (IoT).

The AC-DC converter buck switchers are designed to provide highly efficient, offline power conversion for light-load applications and both discontinuous and continuous conduction modes are supported.

The AP3917 buck switcher can convert a full-wave rectified, AC input voltage between 85VAC and 265VAC to a nominal 8.0V DC output. Its non-isolated design requires no external transformer and very few external components, saving space and BoM cost.

With a no-load power consumption of less than 30mW, the AP3917 buck switchers are particularly suitable for small appliances that operate in standby mode for prolonged periods when connected to an AC outlet. Its low-power credentials and small solution size also make the AP3917 appropriate for IoT devices that are always connected but not always active.

Supplied in a surface-mount SO-7 package, the AP3917BS7-13 is available priced at $0.22 in 4000 piece quantities.

www.diodes.com

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