Diodes AL8807 Instrukcja Użytkownika Pobierz pdf

AL8807

Document number: DS35281 Rev. 5 - 2

1 of 20

www.diodes.com

March 2013

L8807

HIGH EFFICIENCY LOW 36V 1A BUCK LED DRIVER

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 V

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, MSOP-8EP: Available in “Green” Molding Compound

(No Br, Sb)

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

SOT25

(Top View)

GND

CTRL

SET

(Top View)

MSOP-8EP

SET

GND

CTRL

N/C

Applications

 MR16 Lamps

 General Illumination Lamps

 12V Powered LED Lamps

 24V Powered LED Lamps

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 <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit



100 nF

1µF

DFLS2100

DFLS 2100

DFLS2100

GND

CTRL

SET

AL8807

0R15

33µH

100nFC5

150µF

NODE

CATHODE

1 2 3 4 5 6 ... 19 20

Podsumowanie treści

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Strona 4 - V = V= 12V

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Strona 9 - Application Information

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Strona 10 - PWM Dimming

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Strona 11 - Capacitor Selection

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Strona 12 - Inductor Selection

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Strona 13 - Thermal Considerations

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