AL8806MP8-13 Diodes Incorporated

NOT RECOMMENDED FOR NEW DESIGN USE AL8860 OR AL8861 AL8806 HIGH EFFICIENCY 36V 1.5A BUCK LED DRIVER Description Pin Assignments The AL8806 is a step-down DC/DC converter designed to drive LEDs with a constant current. The device can drive up to 8 LEDs, depending on the forward voltage of the LEDs, in series from a SETSET 11 88 VV ININ voltage source of 6V to 36V. The AL8806 switches at frequencies up GGNDND 22 77 N/N/CC to 1MHz. This allows the use of small size external components, AALL88068806 GGNDND 33 66 SWSW hence minimizing the PCB area needed. CTCTRLRL 44 55 SWSW Maximum output current of AL8806 is set via an external resistor MSOP-8EP connected between the V and SET input pins. Dimming is achieved IN by applying either a DC voltage or a PWM signal at the CTRL input pin. An input voltage of 0.4V or lower at CTRL switches off the output MOSFET simplifying PWM dimming. Applications Features High Power MR16 Lamps LED driving current up to 1.5A General Illumination Lamps Better than 5% accuracy Multi-Die LED Driver High efficiency up to 98% Operating input voltage from 6V to 36V High switching frequency up to 1MHz PWM/DC input for dimming control Built-in output open-circuit protection MSOP-8EP: Available in Green Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant 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 AL8806 Pin Descriptions Pin Number Pin Function Name MSOP-8EP SW 5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI. GND 2, 3 GND Pin Dimming and On/Off Control Input. Leave floating for normal operation. (V = V = 2.5V giving nominal average output current I = 0.1/R ) CTRL REF OUTnom S CTRL 4 Drive to voltage below 0.4V to turn off output current Drive with DC voltage (0.5V < V < 2.5V) to adjust output current from 20% to 100% of I CTRL OUTnom A PWM signal (low level 0.4V and high level > 2.6 transition times less than 1us) allows the output current to be adjusted below the level set by the resistor connected to SET input pin. SET 1 Set Nominal Output Current Pin. Configure the output current of the device. Input Supply Pin. Must be locally decoupled to GND with > 2.2F X7R ceramic capacitor see applications section for V 8 IN more information. Exposed pad: EP EP Connect to GND and thermal mass for enhanced thermal impedance. It should not be used as electrical ground conduction path. N/C 7 no connection Functional Block Diagram 2 of 15 March 2021 AL8806 Diodes Incorporated www.diodes.com Document number: DS35144 Rev. 6 - 3