AL9902 Datasheet, PDF (1/18 Pages) Diodes Incorporated – LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER

AL9902
LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER
Description
The AL9902 high-voltage PWM LED driver provides an efficient
solution for offline high-brightness LED lamps from rectified line
voltages ranging from 85VAC up to 277VAC. The AL9902 has an
internal MOSFET that allows switching frequencies up to 300kHz,
with the switching frequency determined by an external single
resistor. The AL9902 topology creates a constant current through the
LEDs providing constant light output. The output current is
programmed by one external resistor.
The LED brightness can be varied by both linear and PWM dimming
using the AL9902’s LD and PWM pins respectively. The PWM input
operates with duty ratio of 0-100% and frequency of up to several
kHz.
The AL9902 is available in the thermally enhanced U-DFN6040-12
and SO-16 packages.
Pin Assignments
SW NC SO GND CS VIN
12 11 10 9 8 ₇₇
EP1
EP2
11 2 3 4 5 66
NC NC PWM VDD LD Rosc
U-DFN6040-12
NC SO NC NC GND CS NC VIN
16 15 14 13 12 11 10 9
Features
 >90% Efficiency
 Universal Rectified 85 to 277VAC Input Range
 Internal MOSFET Up to 650V, 2A
 High Switching Frequency Up to 300kHz
 Internal Voltage Regulator Removes Start-Up Resistor
 7.5V Regulated Output
 Tighter Current Sense Tolerance Better Than ±5%
 LED Brightness Control with Linear and PWM Dimming
 Internal Over-Temperature Protection (OTP)
 U-DFN6040-12 and SO-16 Packages
 Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
1 2 3 45 6 7 8
NC NC SW NC PWM VDD LD Rosc
SO-16
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.
Typical Applications Circuit
AC+
Z1
AC- ^602V
1
2 _HD06 3
C1
4
C2
VIN
VDD
Rosc
LD _AL9902 SW
PWM
SO
GND
CS
Rsense
C3
D1
L1
Rosc
AL9902
Document number: DS37878 Rev. 1 - 2
1 of 18
www.diodes.com
July 2015
© Diodes Incorporated