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The AL1673 is a high performance single stage Flyback/Buck-Boost converter, targeting dimmable LED lighting application. It is operating at BCM mode which results in good EMI and efficiency.

The AL1673 can support multiple dimming modes. When a 0.3~2.4V DC signal is applied on APWM pin, the device will operate in analog dimming mode. When a digital signal is applied on APWM pin, the device works at PWM dimming mode.

The AL1673 features low start-up current and low operation current. It integrates multiple protections including over voltage, short circuit, over current and over temperature protection. It also integrates 600V/2A high voltage MOSFET.

The AL1673 is available in SO-8EP package.


  • General LED Lighting Driver with Dimming Function
  • General Purpose Constant Current Source
  • Smart LED Lighting


  • Valley Switching for Low Switching Loss
  • Low Start-Up Current 
  • High PF and Low THD
  • High Efficiency
  • Tight LED Current Variation Range
  • Tight Output Open Voltage Variation Range
  • Integrates 600V/2A MOSFET 
  • Support Both PWM Dimming and Analog Dimming 
  • PWM Dimming Range: 3% to 100% at 1kHz PWM Frequency
  • Analog Dimming and PWM-to-DC Dimming Range: 18% to 100%
  • Internal Protections
    • Under Voltage Lock Out (UVLO)
    • Output Over Voltage Protection (OVP)
    • Output Short Protection (OSP)
    • Over Current Protection (OCP)
    • Thermal Fold-back Protection (TFP)
    • Over Temperature Protection (OTP)
  • Low System Cost
  • Package: SO-8EP

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 265
Maximum DC VDD (VDC) 30
LED Current (mA) 100
Frequency (kHz) 200
Accuracy 3 %
Efficiency 85 %
Dimming PWM, Analog
Supply Current N/A mA
Temperature Range -40 to 150 °C

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AL1673-20CSP-13 Mouser Electronics Inc. 4770 8/3/2020 Buy Now United States
AL1673-20CSP-13 Digi-Key Electronics 1753 8/2/2020 Buy Now United States