AL8805

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

AL8805

Document number: DS35030 Rev. 1 - 2

2 of 16

www.diodes.com

September 2010

© Diodes Incorporated

Absolute Maximum Ratings

Symbol

Parameter

Ratings

Unit

ESD HBM

Human Body Model ESD Protection

2.5

kV

ESD MM

Machine Model ESD Protection

200

V

-0.3~36

V

SW voltage relative to GND

-0.3~36

V

CTRL pin input voltage

-0.3 ~ 6

V

Switch current

1.25

A

Junction Temperature

150

°C

Lead Temperature Soldering

300

°C

Storage Temperature Range

-65 to +150

°C

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

exceeded under any condition. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions

should be taken when handling and transporting these devices

Recommended Operating Conditions

Symbol

Parameter

Min

Max

Unit

Operating Input Voltage relative to GND

6.0

30

V

Voltage High for PWM dimming relative to GND

2.6

5.5

V

Voltage range for 20% to 100% DC dimming relative to GND

0.5

2.5

V

Voltage Low for PWM dimming relative to GND

0

0.4

V

Continuous switch current

1

A

Junction Temperature Range

-40

125

°C

Pin Descriptions

Pin Name

Pin Number

Descriptions

SW

1

Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin

to reduce EMI.

GND

2

GND Pin

CTRL

3

Dimming and On/Off Control Input.

•

Leave floating for normal operation.

•

Drive to voltage below 0.4V to turn off output current

•

•

A PWM signal (low level

≤ 0.4V and high level > 2.6; transition times less than 1us)

allows the output current to be adjusted below the level set by the resistor connected

to SET input pin.

SET

4

Set Nominal Output Current Pin. Configure the output current of the device.

5

Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor

– see applications section for more information.