AL9910_1106 Datasheet, PDF (1/15 Pages) Diodes Incorporated – UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER

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 85V_AC up to
277V_AC. 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
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.
Features
(Top View)
VIN ¹
CS 2
GND 3
Gate 4
AL9910
8 Rosc
7 LD
6 VDD
5 PWM_D
SO-8
(Top View)
VIN ¹
CS 2
GND 3
Gate 4
AL9910
8 Rosc
7 LD
6 VDD
5 PWM_D
SO8-EP
• >90% Efficiency
• Universal rectified 85 to 277V_AC input range
• Input voltage up to 500V
Applications
• Internal voltage regulator removes start-up resistor
o 7.5V MOSFET drive – AL9910
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
• 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
• 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
V_AC IN
C1
BR1
C2
V_IN
V_{DD AL9910/A}
Q1
LD
GATE
PWM_D
CS
R_{OSC GND}
R_OSC
C3
D1
L1
R_SENSE
AL9910/AL9910A/AL9910-5
Document number: DS 35103 Rev. 3 - 2
1 of 15
www.diodes.com
June 2011
© Diodes Incorporated