AL8861 datasheet(2/18 Pages) DIODES

2 / 18 page

AL8861

Document number: DS39435 Rev. 3 - 2

2 of 18

www.diodes.com

October 2017

AL8861

Typical Applications Circuit

Pin Descriptions

Pin Number

Pin Name

Function

TSOT25/

SOT89-5

MSOP-8EP

5, 6

Drain of NDMOS Switch

2, 3

GND

Ground (0V)

VSET

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 < VSET < 2.5V) to adjust output current from 0 to 100% of

IOUTNOM. Linear adjustment range from 5% to 100% of IOUTNOM



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

current.

Linear adjustment range from 1% to 100% of IOUTNOM for f < 500Hz



Connect a capacitor from this pin to Ground to increase soft-start time. (Default soft-start

time = 0.1ms. Additional soft-start time is approximately 1.5ms/1nF)

ISENSE

Connect resistor RS from this pin to VIN to define nominal average output current.

IOUTNOM = 0.1/RS

VIN

Input voltage (4.5V to 40V).

Decouple to Ground with 10μF or higher X7R ceramic capacitor

close to device.

—

N/C

No Connection

VIN

ISENSE

VSET

VIN

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