UNIVERSAL FLYBACK AND BUCK-BOOST
SINGLE STAGE DIMMABLE LED CONTROLLER
The AL1663/AL1663R 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
and switching at the valley which results in good EMI and efficiency.
With working in constant on time, the system achieves high PF and
low total harmonic distortion (THD) under universal input voltage.
The AL1663/AL1663R can support multiple dimming modes. When a
0.3V to 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. And for AL1663
When a digital signal is applied on PWMD pin and the APWM pin is
connected with a hundreds of nF capacitor, the device will work in
PWM-to-DC dimming mode.
The AL1663/AL1663R features low start-up current and low operation
current. It integrates multiple protections including over voltage, short
circuit, over current and over temperature protection.
General LED Lighting Driver with Dimming Function
General Purpose Constant Current Source
LED Backlighting Driver
Smart LED Lighting
The AL1663/AL1663R is available in SO-8 package.
Primary Side Regulation without Opto-coupler
Valley Switching for Low Switching Loss
Low Start-up Current
High PF and Low THD
Tight LED Current Variation Range
Tight Output Open Voltage Variation Range
Support both PWM Dimming and Analog Dimming
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
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) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
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: DS38466 Rev. 2 - 2
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