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AL9910

UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER



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AL9910 pdf
AL9910/ AL9910A/ AL9910-5/ AL9910A-5
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
Description
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.
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
(Top View)
VIN
CS
GND
GATE
1
2
3
4
AL9910
8 ROSC
7 LD
6 VDD
5 PWM_D
SO-8
(Top View)
VIN
CS
GND
GATE
1
2
3
4
AL9910
8 ROSC
7 LD
6 VDD
5 PWM_D
SO-8EP
Features
>90% Efficiency
Universal Rectified 85 to 277VAC Input Range
Input Voltage Up to 500V
Internal Voltage Regulator Removes Start-Up Resistor
ƒ 7.5V MOSFET Drive – AL9910
ƒ 10V MOSFET Drive – AL9910A
Tighter Current Sense Tolerance: 5% AL9910-5, AL9910A-5
Drives LED Lamps with Both High and Low Current LEDs
LED Brightness Control with Linear and PWM Dimming
Internal Thermal Protection (OTP)
Available in SO-8 and SO-8EP Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3) 
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. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AL9910/ AL9910A/ AL9910-5/ AL9910-5A
Document number: DS35103 Rev. 9 - 2
1 of 15
www.diodes.com
May 2014
© Diodes Incorporated



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AL9910 pdf
Typical Applications Circuit
AL9910/ AL9910A/ AL9910-5/ AL9910A-5
VAC IN
C1
BR1
C2
VDD
VIN
AL9910/A
Q1
LD GATE
PWM_D
ROSC GND
CS
ROSC
D1 C3
L1
RSENSE
Pin Descriptions
Pin
Name
VIN
CS
GND
Gate
PWM_D
VDD
LD
ROSC
EP PAD
Pin Number
SO-8 SO-8EP
11
22
33
44
55
66
77
88
N/A EP
Function
Input Voltage
Senses LED string and external MOSFET switch current
Device Ground
Drives the gate of the external MOSFET switch.
Low Frequency PWM Dimming pin, also Enable input. Internal 200kpull-down to GND.
Internally regulated supply voltage.
ƒ 7.5V nominal for AL9910 and AL9910-5
ƒ 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.
Linear Dimming Input. Changes the current limit threshold at current sense comparator and changes the
average LED current.
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 the external oscillator resistor between
ROSC pin and the gate of the external MOSFET.
Exposed Pad (bottom). Connect to GND directly underneath the package.
Functional Block Diagram
AL9910/ AL9910A/ AL9910-5/ AL9910-5A
Document number: DS35103 Rev. 9 - 2
2 of 15
www.diodes.com
May 2014
© Diodes Incorporated



Part Number AL9910
Description UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
Maker Diodes - Diodes
Total Page 15 Pages
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