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AL9902

LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER



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AL9902 pdf
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
4
C1
C2
VIN
VDD
LD AL9902
PWM
GND
Rosc
SW
SO
CS
Rsense
C3
D1
Rosc
L1
AL9902
Document number: DS37878 Rev. 1 - 2
1 of 18
www.diodes.com
July 2015
© Diodes Incorporated



No Preview Available !

AL9902 pdf
AL9902
Pin Descriptions
Pin Name
NC
NC
PWM
VDD
LD
ROSC
VIN
CS
GND
NC
SO
SW
EP1
EP2
U-DFN5040-10
1
2
3
4
5
6
7
8
9
11
10
12
EP1
EP2
SO-16
Functions
14 No connection
1, 2, 4, 10,16 No connection
5 Low Frequency PWM Dimming pin, also Enable input. Internal 200kΩ pull-down to GND
Internally regulated supply voltage.
7.5V nominal.
6 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
7 changes the average LED current.
Oscillator control.
8 A resistor connected between this pin and ground puts the AL9902 into fixed frequency mode and
sets the switching frequency.
9 Input voltage
11 Senses LED string and internal MOSFET switch current
12 Device ground
13 No connection
15 Source of the internal MOSFET Switch
3 Drain of the internal MOSFET switch.
NA Exposed Pad 1(bottom). Drain connection of internal power MOSFET.
NA Exposed Pad 2 (bottom). Substrate connection of control IC. Connect to GND directly underneath
the package and large PCB area to minimize junction to ambient thermal impedance.
Functional Block Diagram & Typical Application
VIN
VIN
VDD LDO
VDD
250mV
7.5V
LD
PWM
OTP
200K
GND
OSC
S
R
AL9902
Rosc D1
SW
Rosc
SO
CS
Rsense
AL9902
Document number: DS37878 Rev. 1 - 2
2 of 18
www.diodes.com
July 2015
© Diodes Incorporated



Part Number AL9902
Description LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER
Maker Diodes - Diodes
Total Page 18 Pages
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