AL1663S-13

AL1663/AL1663R UNIVERSAL FLYBACK AND BUCK-BOOST SINGLE STAGE DIMMABLE LED CONTROLLER Description Pin Assignments 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 optocoupler 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. (Top View) 8 APWM 2 7 COMP 6 VCC 5 OUT APWM 1 8 FB NC 1 PWMD 2 7 VCC FB COMP 3 6 OUT CS 3 CS 4 5 GND GND 4 AL1663 SO-8 AL1663R SO-8 Applications     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. Features              Primary Side Regulation without Opto-coupler 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 Support both PWM Dimming and Analog Dimming 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-8 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 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" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain