AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED
DRIVER
Description
Pin Assignments
The AL9910/A high voltage PWM LED driver-controller
provides an efficient solution for offline high brightness LED
lamps from rectified line voltages ranging from 85VAC up to
277VAC. The AL9910 drives external MOSFETs at switching
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
(Top View)
1
2
3
4
Rosc
LD
8
7
6
5
VIN
CS
AL9910
GND
Gate
VDD
PWM_D
SO-8
(Top View)
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.
1
8
7
6
5
Rosc
LD
V
IN
2
3
4
CS
AL9910
GND
Gate
V
DD
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.
PWM_D
SO-8EP
Features
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•
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•
>90% Efficiency
Universal rectified 85 to 277VAC input range
Input voltage up to 500V
Applications
Internal voltage regulator removes start-up resistor
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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
o
o
7.5V MOSFET drive – AL9910
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)
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
C3
L1
D1
VIN
VAC IN
VDD
LD
C1
Q1
AL9910/A
BR1
GATE
C2
CS
PWM_D
ROSC
RSENSE
GND
ROSC
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www.diodes.com
March 2011
© Diodes Incorporated
AL9910/AL9910A
Document number: DS 35103 Rev. 2 - 2