AL9910/AL9910A/AL9910-5
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)
ROSC
LD
1
2
8
7
6
5
VIN
CS
AL9910
VDD
GND 3
4
GATE
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.
ROSC
LD
1
8
VIN
2
7
6
5
CS
AL9910
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.
VDD
GND 3
4
GATE
PWM_D
SO-8EP
Features
• >90% Efficiency
Applications
•
•
•
•
•
LED offline lamps
High voltage DC-DC LED Driver
• Universal rectified 85 to 277VAC input range
• Input voltage up to 500V
• Internal voltage regulator removes start-up resistor
o 7.5V MOSFET drive – AL9910
Signage and Decorative LED Lighting
Back Lighting of Flat Panel Displays
General purpose constant current source
o 10V MOSFET drive – AL9910A
• Tighter current sense tolerance: 5% AL9910-5
• 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) & 2011/65/EU (RoHS 2). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
C3
D1
VIN
L1
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
February 2012
© Diodes Incorporated
AL9910/AL9910A/AL9910-5
Document number: DS35103 Rev. 7 - 2