AL9910/AL9910A

UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED

DRIVER

AL9910/AL9910A

Document number: DS 35103 Rev. 2 - 2

1 of 14

www.diodes.com

March 2011

© Diodes Incorporated

Description

The AL9910/A high voltage PWM LED driver-controller

provides an efficient solution for offline high brightness LED

frequencies up to 300kHz, with the switching frequency

determined by a single resistor. The AL9910 topology creates

a constant current through the LEDs providing constant light

output. The output current is programmed by one external

resistor and is ultimately determined by the external

MOSFET chosen and therefore allows many low current

LEDs to be driven as well as a few high current LEDs

The LED brightness can be varied by both Linear and PWM

dimming

using

the

AL9910’s

LD

and

PWM_D

pins

respectively. The PWM_D input operates with duty ratio of

0-100% and frequency of up to several kHz.

The AL9910 can withstand input voltages up to 500V which

makes it very resilient to transients at standard mains

voltages. As well as standard SO-8 package the AL9910 is

available in the thermally enhanced SO-8EP package.

Pin Assignments

SO-8

1

2

3

45

6

7

8

(Top View)

CS

Gate

GND

LD

Rosc

PWM_D

AL9910

Features

•

>90% Efficiency

•

•

Input voltage up to 500V

•

Internal voltage regulator removes start-up resistor

o

7.5V MOSFET drive – AL9910

o

10V MOSFET drive – AL9910A

•

Drives LED Lamps with both high and low current LEDs

•

LED brightness control with Linear and PWM dimming

•

Internal Thermal Protection (OTP)

•

SO-8 and SO-8EP in “Green” Molding Compound

•

(No Br, Sb) with Lead Free Finish/ RoHS Compliant

(Note 1)

Applications

• LED offline lamps

• High voltage dc-dc LED Driver

• Signage and Decorative LED Lighting

• Back Lighting of Flat Panel Displays

• General purpose constant current source

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

R

SENSE

AL9910/A

GATE

CS

LD

PWM_D

GND

R

OSC

V

DD

V

IN

V

Q1

L1

D1

C1

R

OSC

C2

C3

BR1

R

SENSE

AL9910/A

GATE

CS

LD

PWM_D

GND

R

OSC

V

DD

V

IN

V

Q1

L1

D1

C1

R

OSC

C2

C3

BR1

SO-8EP

1

2

3

45

6

7

8

(Top View)

CS

Gate

GND

LD

Rosc

PWM_D

AL9910