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AL9902 Datasheet

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



Diodes Semiconductor Electronic Components Datasheet

AL9902 Datasheet

LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER

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



Diodes Semiconductor Electronic Components Datasheet

AL9902 Datasheet

LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER

No Preview Available !

AL9902 pdf
AL9902
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
VIN(MAX)
VCS
VLD
VPWM
VSW
VSO
VGate
VDD(MAX)
-
-
TJ
TST
ESD HBM
Parameter
Maximum Input Voltage, VIN, to GND
Maximum CS Input Pin voltage Relative to GND
Maximum LD Input Pin Voltage Relative to GND
Maximum PWM input Pin Voltage Relative to GND
Maximum MOSFET Drain Pin Voltage Relative to GND
Maximum MOSFET Source Pin Voltage Relative to GND
Maximum MOSFET GATE pin Voltage Relative to GND
Maximum VDD Pin Voltage Relative to GND
Continuous Power Dissipation (TA = +25C)
U-DFN6040-12 (derate 10mW/C above +25C)
Junction Temperature Range
Storage Temperature Range
Human Body Model ESD Protection (Note 5)
Ratings
-0.5 to +520
-0.3 to +0.45
-0.3 to (VDD +0.3)
-0.3 to (VDD +0.3)
-0.5 to +650
-0.5 to (VDD +0.3)
-0.5 to (VDD +0.3)
8.1
-
1,000
+150
-65 to +150
2,000
Unit
V
V
V
V
V
V
V
V
-
mW
°C
°C
V
Notes:
4. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional
operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.
5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling
and transporting these devices.
Maximum Ratings of Internal MOSFET (@TA = +25°C, unless otherwise specified.)
Characteristic
Drain-Source Voltage
Gate-Source Voltage
Continuous Drain Current (Note 5) VGS = 10V
Pulsed Drain Current (Note 6)
Steady
State
TC = +25°C
TC = +100°C
Avalanche Current (Note 7) VDD = 100V, VGS = 10V, L = 60mH
Repetitive Avalanche Energy (Note 7) VDD = 100V, VGS = 10V, L = 60mH
Peak Diode Recovery
Symbol
VDSS
VGSS
ID
IDM
IAR
EAR
dv/dt
Value
650
±30
1.6
1
3
0.8
22
5
Units
V
V
A
A
A
mJ
V/ns
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
VINDC
TA
ISW
VDD
VPWM(lo)
VPWM(hi)
Input DC Supply Voltage Range
Ambient Temperature Range
Switch Pin Output Current
Maximum Recommended Voltage Applied to VDD Pin (Note 6)
Pin PWM input Low Voltage
Pin PWM input High Voltage
Note:
6. when using the AL9902 in isolated LED lamps an auxiliary winding might be used.
Min
20
-40
-
-
0
2.4
Max
500
+105
0.4
8.1
1
VDD
Unit
V
°C
A
V
V
AL9902
Document number: DS37878 Rev. 1 - 2
3 of 18
www.diodes.com
July 2015
© Diodes Incorporated




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