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Diodes Incorporated


Diodes Incorporated has announced the AP3917 family of non-isolated AC-DC switching buck converters for low-power applications powered by a mains electricity outlet.

The AP3917 family consists of the AP3917B, rated for a 170mA nominal load, AP3917C for a 270mA load and the AP3917D, which has a 370mA rating.

The small AP3917 parts offer direct, non-isolated AC-DC conversion at high efficiency, while drawing a low standby current. These attributes are in increasing demand due to the proliferation of small, mains-powered appliances operating as either stand-alone devices or as IoT endpoints. Offering high conversion efficiency both at full and light loads, the AP3917 parts support both discontinuous and continuous conduction modes.

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

Featuring no-load power consumption of <30mW, the AP3917 buck switchers are particularly suitable for small appliances which operate in standby mode for prolonged periods when connected to an AC outlet.

  • 200μA operating current
  • 2W power rating
  • Frequency modulation to suppress EMI
  • Over-temperature protection
  • Overload protection
  • Short-circuit protection
  • Home appliances
  • Office equipment
  • Industrial devices
  • IoT devices


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