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AL8807 Datasheet(PDF) 1 Page - Diodes Incorporated |
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AL8807 Datasheet(HTML) 1 Page - Diodes Incorporated |
1 / 21 page AL8807 HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 1 of 21 www.diodes.com June 2012 © Diodes Incorporated Description The AL8807 is a step-down DC/DC converter designed to drive LEDs with a constant current. The device can drive up to 9 LEDs, depending on the forward voltage of the LEDs, in series from a voltage source of 6V to 36V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8807 switches at frequency up to 1MHz with controlled rise and fall times to reduce EMI. This allows the use of small size external components, hence minimizing the PCB area needed. Maximum output current of AL8807 is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved 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. Features • LED driving current up to 1.3A (MSOP-8EP) • Better than 5% accuracy • High efficiency up to 96% • Optimally controlled switching speeds • Operating input voltage from 6V to 36V • PWM/DC input for dimming control • Built-in output open-circuit protection • SOT25: Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant (Note 1) • MSOP-8EP Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant (Note 1) Pin Assignments Applications • MR16 lamps • General illumination lamps • 12V powered LED Lamps • 24V powered LED Lamps Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2). All applicable RoHS exemptions applied.Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit SOT25 (Top View) SW GND CTRL SET V IN (Top View) MSOP-8EP SET GND GND CTRL V IN N/C SW SW 100 nF C1 1µF C4 D1 DFLS 2100 D2 DFLS 2100 D3 DFLS 2100 D5 DFLS 2100 D4 DFLS 2100 GND SW GND CTRL U1 AL8807 0R15 R1 L1 33µH 100nF C5 150µF C2 150µF C3 P1 P2 ANODE CATHODE |
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