Datasheet > AL8860_18

AL8860_18

更新时间： 2022-02-26 11:42:32

品牌	Logo	应用领域
美台 - DIODES		驱动
页数	文件大小	规格书
17页	569K
描述
40V 1.5A BUCK LED DRIVER

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数据手册

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AL8860_18 数据手册

AL8860

Typical Applications Circuit

Pin Descriptions

Pin Number

Pin Name

Function

TSOT25

MSOP-8EP

5,6

2,3

Drain of NDMOS switch.

Ground (0V)

GND

• Multi-function On/Off and brightness control pin:

• Leave floating for normal operation.

• Drive to voltage below 0.2V to turn off output current

• Drive with DC voltage (0.3V < CTRL< 2.5V) to adjust output current from 0 to 100% of I_{OUT_NOM}

• Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.

Linear adjustment range from 1% to 100% of I_{OUT_NOM}for f < 500Hz

CTRL

• Connect a capacitor from this pin to ground to increase soft-start time.

(Default soft-start time = 0.1ms. Additional soft-start time is approx.1.5ms/1nF)

SET

VIN

Connect resistor R_Sfrom this pin to VIN to define nominal average output current: I_{OUT_NOM}= 0.1/Rs

Input voltage (4.5V to 40V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to

device.

Exposed pad. Connect to GND and thermal mass for enhanced thermal impedance. Should not be

used as electrical ground conduction path.

N/C

No Connection

Functional Block Diagram

SET

4(1)

1(5,6)

VIN

5(8)

4.5V

VDD

Generator

Current

Monitor

4.5V_Drv

Comp

PWM

BG &

Reference

Ref

Hysteresis

Control

Logic & Driver

PWM/DC

Dimming

PWM

OTP

CTRL

AꢀBꢁ

A for TSOT25

B for MSOP-8EP

3(4)

2(2,3)

GND

AL8860

2 of 17

www.diodes.com

July 2018

AL8860

Document number: DS39014 Rev. 4 - 2

123 4 5 6 7...17

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