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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.


• >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 
• Halogen and Antimony Free. “Green” Device 


• 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

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 277
Maximum DC VDD (VDC) 500
LED Current (mA) 400
Frequency (kHz) 300
Accuracy (%) 3 %
Efficiency (%) 90 %
Dimming Linear and PWM
SupplyCurrent (mA) 1 mA
Temperature Range (°C) -40 to 125 °C

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Arrow Electronics Central EU 3000 10/4/2022 Europe Buy Now
Mouser Electronics Inc. 4724 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
Digi-Key Electronics 38980 10/3/2022 Europe, Asia, North America Buy Now
Future Electronics - Europe 12000 10/3/2022 England Contact Sales
Request Sample


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Mouser Electronics Inc. 7497 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
Future Electronics - Europe 2500 10/3/2022 England Contact Sales
Request Sample

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site