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AL9901

UNIVERSAL HIGH VOLTAGE LED DRIVER



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AL9901 pdf
AL9901
UNIVERSAL HIGH VOLTAGE LED DRIVER
Description
The AL9901, high-voltage PWM LED driver provides an efficient
solution for offline, high-brightness LED lamps for rectified line
voltages ranging from 85VAC up to 305VAC. The AL9901 has an
internal MOSFET that allows switching frequencies up to 300kHz,
with the switching frequency determined by an external single
resistor. The AL9901 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 AL9901’s LD and PWM pins respectively. The PWM input
operates with a duty ratio of 0-100% and a frequency of up to several
kHz.
The AL9901 is available in the thermally enhanced U-DFN6040-12
and SO-16 packages. The SO-16 is compliant to high voltage spacing
rules for 230VAC mains applications.
Pin Assignments
U-DFN6040-12
Features
>90% Efficiency
Universal Rectified 85 to 305VAC 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)
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 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
AL9901
Document number: DS37713 Rev. 1 - 2
1 of 20
www.diodes.com
March 2015
© Diodes Incorporated



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AL9901 pdf
AL9901
Pin Descriptions
Pin Name
Gate
NC
PWM
VDD
LD
ROSC
VIN
CS
GND
DRV
SO
SW
EP1
EP2
U-DFN5040-10
1
2
3
4
5
6
7
8
9
10
11
12
EP1
EP2
SO-16
Functions
14 Gate of Internal MOSFET switch.
1, 2, 4, 10,16 No connection
5 Low Frequency PWM Dimming pin, also Enable input. Internal 200kpull-down to GND
Internally regulated supply voltage, 7.5V nominal.
Can supply up to 1 mA for external circuitry. A sufficient storage capacitor is used to provide
6 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 AL9901 into fixed frequency mode and
sets the switching frequency. A resistor connected between this pin and Gate pin puts the AL9901
into fixed off-time mode and determines the off-time.
9 Input voltage
11 Senses LED string and internal MOSFET switch current
12 Device ground
13 Gate driver output. Connect a resistor between this pin and ROSC pin to put the AL9901 into fixed
off time mode.
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 minimise junction to ambient thermal impedance.
Functional Block Diagram
AL9901
Document number: DS37713 Rev. 1 - 2
2 of 20
www.diodes.com
March 2015
© Diodes Incorporated



Part Number AL9901
Description UNIVERSAL HIGH VOLTAGE LED DRIVER
Maker Diodes - Diodes
Total Page 20 Pages
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