Diodes Incorporated

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Universial high voltage step down converter

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The AL17050 is a universal AC high voltage input step down regulator that provides accurate constant voltage (CV) and outstanding dynamic performance without requiring an opto-coupler over line and Load regulation. Typical applications are offline low power applications including home appliance applications and IoT applications.

Working with a single winding inductor and integrating a 500V MOSFET internal can make it use fewer external components and create a low Bill Of Material (BOM) cost solution.

The AL17050 achieves excellent regulation and high power efficiency. The characteristics of max peak current and driving frequency vary as the load change can get excellent efficiency performance at light load and improve the overall average efficiency.

The AL17050 has rich protection features to enhance the system safety and reliability. It has Over Temperature Protection, VCC Under Voltage Lock function, Output Short Protection, Over Load Protection and Open Loop Protection.

The AL17050 is available in the SOT25 package.


  • Universal 85 to 265 VAC Input Range
  • Constant Voltage (CV) Control
  • Internal MOSFET up to 500V
  • Low Operation Current: 100µA (Static)
  • Under Voltage Lock Out (UVLO)
  • Output Short Protection
  • Over Load Protection
  • Over Temperature Protection (OTP)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated‟s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000 ppm antimony compounds.


  • Home Appliance Applications
  • IoT Applications
  • Industrial Controls
  • Standby Power

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 265
Maximum DC VDD (VDC) 400
LED Current (mA) N/A
Frequency (kHz) N/A
Accuracy (%) 4 %
Efficiency (%) >60 %
Dimming N/A
SupplyCurrent (mA) N/A mA
Temperature Range (°C) N/A °C

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