HIGH PERFORMANCE DIMMABLE LED CONTROLLER
The AL1666 is a high performance single stage Flyback and Buck-
boost 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 is operating at BCM mode which results
in good EMI and efficiency, and keeps high PF and low THD under
universal input voltage.
The AL1666 can support analog/PWM dimming modes. When a 0 to
2.4V DC signal is applied on ADIM pin, the device will operate in
analog dimming mode; when a digital signal is applied on PWMD pin
and the ADIM pin is connected with hundreds of nF capacitors, the
device will work at PWM-to-DC dimming mode. The dimming range is
1% to 100%.
The AL1666 has rich protection features. It integrates multiple
protections including Under Voltage Lock Out (UVLO), Output Over
Voltage Protection (OVP), Output Short Circuit Protection (OSP),
Over Current Protection (OCP), Winding Short Circuit, Secondary
Diode Short, Internal Thermal Fold-Back Protection (TFP) and Over
Temperature Protection (OTP).
The AL1666 is available in SO-8 (Standard) package.
Primary Side Regulation without Opto-Coupler
Valley Switching for Low Switching Loss
Support Analog and PWM-to-DC Dimming
Analog/PWM-to-DC Dimming Range: 1% to 100%
Tight CS Reference Voltage 0.4V±1.5%
High PF>0.9 and Low THD<20%
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
Winding Short Circuit Protection
Secondary Diode Short Protection
Internal Thermal Fold-back Protection (TFP)
Over Temperature Protection (OTP)
Tight LED Current Variation Range
LED Current Line Regulation: ±2% (90VAC to 305VAC)
LED Current Load Regulation: ±2% Full Load to Half Load
Package: SO-8 (Standard)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified facilities),
please contact us or your local Diodes representative.
General LED Lighting Driver with Dimming Function
0 to 10V Dimming Luminaires
General Purpose Constant Current Source
Smart LED Lighting
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
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Document number: DS42417 Rev. 1 - 2
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