Datasheet > AL8861

AL8861

更新时间： 2022-02-26 12:28:08

品牌	Logo	应用领域
美台 - DIODES		驱动
页数	文件大小	规格书
18页	685K
描述
40V 1.5A BUCK LED DRIVER

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AL8861 数据手册

AL8861

40V 1.5A BUCK LED DRIVER

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)

L_X

GND

V_SET

V_IN

I_SENSE

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.

TSOT25

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

V_SETPin. The V_SETPin will accept either a DC voltage signal or a

PWM signal.

(Top View)

L_X

GND

V_SET

V_IN

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

V_SETPin to Ground. Applying a voltage of 0.2V or lower to the V_SET

Pin can turn off the output and make the device enter into standby

state with low current consumption.

I_SEN

Features



Low BOM Counts

SOT89-5

Wide Input Voltage Range: 4.5V to 40V

Output Current up to 1.5A

I_SENSE

V_IN

Internal 40V NDMOS Switch

Typical 5% Output Current Accuracy

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

PWM Signal

L_X



Recommended Analog Dimming Range: 5% to 100%

Soft-Start

V_SET

High Efficiency (Up to 97%)

MSOP-8EP

LED Short Protection

Inherent Open-Circuit LED Protection

R_SShort Protection

Applications

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)



LED Retrofit for Low Voltage Halogen

Low Voltage Industrial Lighting

LED Backlighting

Illuminated Signs

External Driver with Multiple Channels

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.

1 of 18

www.diodes.com

October 2017

AL8861

Document number: DS39435 Rev. 3 - 2

12 3 4 5 6 7...18

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