AL8861WT-7

AL8861 40V 1.5A BUCK LED DRIVER NEW PRODUCT Description Pin Assignments The AL8861 is a hysteresis mode DC-DC step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device can operate from an input supply between 4.5V and 40V and provide an externally adjustable output current up to 1A for TSOT25 package and 1.5A for SOT89-5 and MSOP-8EP packages. Depending upon supply voltage and external components, this converter can provide up to 40W of output power. (Top View) LX VIN GND VSET The AL8861 integrates the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. ISENSE TSOT25 Dimming can be realized by applying an external control signal to the VSET Pin. The VSET Pin will accept either a DC voltage signal or a (Top View) PWM signal. LX 1 GND 2 VSET 3 5 VIN 4 ISENSE The soft-start time can be adjusted by an external capacitor from the VSET Pin to Ground. Applying a voltage of 0.2V or lower to the VSET Pin can turn off the output and make the device enter into standby state with low current consumption. Features             Low BOM Counts Wide Input Voltage Range: 4.5V to 40V Output Current up to 1.5A Internal 40V NDMOS Switch Typical 5% Output Current Accuracy Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal Recommended Analog Dimming Range: 5% to 100% Soft-Start High Efficiency (Up to 97%) LED Short Protection Inherent Open-Circuit LED Protection RS Short Protection      Over Temperature Protection (OTP) Up to 1MHz Switching Frequency Pb-free TSOT25, SOT89-5 and MSOP-8EP Packages Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: SOT89-5 ISENSE VIN LX LX VSET MSOP-8EP Applications      LED Retrofit for Low Voltage Halogen Low Voltage Industrial Lighting LED Backlighting Illuminated Signs External Driver with Multiple Channels 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