AL9910/AL9910A/AL9910-5

UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED

DRIVER

AL9910/AL9910A/AL9910-5

Document number: DS 35103 Rev. 3 - 2

2 of 15

www.diodes.com

June 2011

© Diodes Incorporated

Pin Descriptions

Pin Name

SO-8

SO-8EP

Descriptions

1

1

Input voltage

CS

2

2

Senses LED string and external MOSFET switch current

GND

3

3

Device ground

Gate

4

4

Drives the gate of the external MOSFET switch.

PWM_D

5

5

Low Frequency PWM Dimming pin, also Enable input. Internal 100k

Ω pull-down to GND

6

6

Internally regulated supply voltage.

•

7.5V nominal for AL9910 and

•

10V nominal for AL9910A.

Can supply up to 1 mA for external circuitry. A sufficient storage capacitor is used to

provide storage when the rectified AC input is near the zero crossing.

LD

7

7

Linear Dimming input. Changes the current limit threshold at current sense comparator

and changes the average LED current.

8

8

Oscillator control. A resistor connected between this pin and ground sets the PWM

frequency. The devices can be switched into constant off time (PFM) mode by connecting

EP PAD

N/A

EP

Exposed Pad (bottom). Connect to GND directly underneath the package.

Functional Block Diagram

250mV

LD

V

DD

LDO

V

IN

OTP

PWM_D

GND

7.5/10V

OSC

S

RO

R

OSC

GATE

CS

100k

V

DD

V

IN

R

SENSE

AL9910/AL9910A

250mV

LD

V

DD

LDO

V

IN

OTP

PWM_D

GND

7.5/10V

OSC

S

RO

R

OSC

GATE

CS

100k

V

DD

V

IN

R

SENSE

AL9910/AL9910A