AL3050

Document number: DS38578 Rev. 2 - 2

2 of 16

www.diodes.com

July 2016

© Diodes Incorporated

AL3050

Typical Applications Circuit

2.7V to 5.5V

2.2µF

L

22µH

VIN

SW

CTRL

VOUT

GND

FB

PWM or single wire

Dimming Control

1µF

Up to 8 LEDs

10

W

Pin Descriptions

Pin Number

Pin Name

Function

1

CTRL

Control pin of the boost converter. It is a multi-functional pin which can be used for enable control, PWM and

digital dimming.

2

VIN

Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC input

voltage constant.

3

VOUT

Output of the boost converter.

4

FB

Feedback pin for current. Connect a resistor between this pin and GND to set the current.

5

GND

Ground.

6

SW

This is the switching node of the IC. Connect the inductor between the VIN and SW pin.

-

Thermal Pad

The thermal pad should be soldered to the analog ground plane. If possible, use thermal via to connect to

ground plane for ideal power dissipation.

Functional Block Diagram

VIN

SW

CTRL

VOUT

FB

UVLO

Soft

Start-up

OSC

Gate Driver

Control

Ramp

Generator

Comp

+

-

+

+

-

Current

Sensor

Error

Amp

+

-

PWM & EasyScale

Reference Control

OVP

Detection

GND