Diodes Incorporated
SO 8

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High performance dimming LED controller

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The AL1665 is a high performance single stage flyback and buckboost controller, targeting dimmable LED lighting application. It is a Primary Side Regulation (PSR) controller which can provide accurate Constant Current (CC) regulation without opto-coupler and secondary control circuitry. It can be operated at BCM mode which results in low EMI and high efficiency, and keeps high Power Factor (PF) and low Total Harmonic Distortion (THD) under universal input voltage.

The AL1665 can support analog/PWM dimming modes. When a 50mV to 2.5V DC signal is applied on ADIM pin, the device will be operated in analog dimming mode. The analog dimming range is 5% to 100%. When a PWM signal is applied to NTC/PWM pin, the device will be operated at PWM dimming mode. The PWM dimming range is 0.5% to 100% (1k PWM dimming frequency).

The AL1665 features low operation current. It integrates multiple protections including overvoltage, short circuit, overcurrent and over-temperature.

The AL1665 is available in SO-8 (Standard) package.


  • Primary Side Regulation without Opto-Coupler
  • Valley Switching for Low Switching Loss
  • Low Start-Up Current
  • Support Analog and PWM Dimming
  • Analog Dimming Range: 5% to 100%
  • PWM Dimming Range: 0.5% to 100% (1k PWM Frequency)
  • Internal Protections
  • Under Voltage Lock Out (UVLO)
  • Output Over Voltage Protection (OVP)
  • Output Short Protection (OSP)
  • Over Current Protection (OCP)
  • CS Short Protection
  • Winding Short Circuit Protection
  • Secondary Diode Short Protection
  • Shorted Current Sense Protection
  • User Programmable NTC Based Thermal Foldback
  • Internal Thermal Fold-Back Protection (TFP)
  • Over Temperature Protection (OTP)
  • Low System Cost
  • High PF>0.9 and Low THD<20%
  • High Efficiency
  • Tight LED Current Variation Range
  • LED Current Line Regulation: ±2%
  • LED Current Load Regulation: ±2% Full Load to Half Load
  • Tight Output Open Voltage Variation Range
  • Package: SO-8 (Standard)


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

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 305
Maximum DC VDD (VDC) 18.5
LED Current (mA) External MOSFET
Frequency (kHz) 80K
Accuracy (%) 1.5 %
Efficiency (%) > 85 %
Dimming PWM, Analog
SupplyCurrent (mA) 2 mA
Temperature Range (°C) '-40 to +105 °C

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