Datasheet > AL8843

AL8843

更新时间： 2023-12-06 20:11:31

品牌	Logo	应用领域
美台 - DIODES		驱动
页数	文件大小	规格书
16页	1452K
描述
40V 3A STEP-DOWN LED DRIVER

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AL8843 数据手册

AL8843

40V 3A STEP-DOWN LED DRIVER

Description

Pin Assignments

The DIODES™ AL8843 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 3A.

Depending upon supply voltage and external components, this

converter can provide up to 60W of output power.

(Top View)

GND

SET

VIN

The AL8843 integrates the power switch and a high-side output

current sensing circuit, which uses an external resistor to set the

nominal average output current.

CTRL

Dimming can be realized by applying an external control signal to the

CTRL pin. The CTRL pin will accept either a DC voltage signal or a

PWM signal.

SO-8EP

Applications

The soft-start time can be adjusted by an external capacitor from the

CTRL pin to Ground. Applying a voltage of 0.3V or lower to the CTRL

pin will shut down the power switch.



LED retrofit for low voltage halogen

Low voltage industrial lighting

LED backlighting

Illuminated signs

External drivers with multiple channels

Features



Wide Input Voltage Range: 4.5V to 40V

Output Current up to 3A

Internal 40V NDMOS Switch

Typical 4% Output Current Accuracy

Single Pin for On/Off and Brightness Control by DC Voltage or

PWM Signal



Recommended Analog Dimming Range: 10% to 100%

Soft-Start

High Efficiency (Up to 97%)

LED Short Protection

Inherent Open-Circuit LED Protection

Over Temperature Protection (OTP)

Up to 1MHz Switching Frequency

SO-8EP Package 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)

An Automotive-Compliant Part is Available Under Separate

Datasheet (AL8843Q)

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-free/ 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.

1 of 16

www.diodes.com

August 2022

AL8843

Document number: DS40367 Rev. 2 - 2

12 3 4 5 6 7...16

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