Diodes Incorporated

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AL1788 is a high performance AC/DC Power Factor Correction (PFC) controller targeting at LED lighting applications. Based on Primary Side Regulation (PSR) implementation, AL1788 does not require opto-coupler and any secondary feedback circuit to save overall BOM cost. It operates at Quasi-Resonant (QR) mode where MOSFET is turned on at the valley of the drain voltage, which minimizes switching loss to result in high efficiency. 


  • PSR Implementation Based on Flyback and Buck Topology 
  • Universal AC Voltage Input for Constant Voltage (CV) Regulation
  • Valley Detection for Primary MOSFET Switch to Achieve Low Switching Loss and High Efficiency
  • High PF (>0.9) and Low THD (<20%) for Wide Loading Range (50% to Full Loading)
  • Internal Protections: 
  • Under-Voltage Lockout (UVLO)
  • Over-Voltage Protection (OVP)
  • Over-Current Protection (OCP)
  • Output Short Protection (OSP)
  • Over-Temperature Protection (OTP): Thermal Shutdown and Auto Thermal Recovery
  • Low Standby Power 
  • Low System BOM Cost 
  • Controller with External MOSFET


  • General LED Lighting
  • Smart Connected LED Light Bulbs
  • Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling Lights
  • High PFC and low THD power supply

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 305
Maximum DC VDD (VDC) 25
LED Current (mA) N/A
Frequency (kHz) 120
Accuracy (%) 4 %
Efficiency (%) 87 %
Dimming N/A
SupplyCurrent (mA) N/A mA
Temperature Range (°C) -40 to 105 °C

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site