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A8509 Datasheet (PDF) - Allegro MicroSystems

A8509 Datasheet PDF - Allegro MicroSystems
Part # A8509
Download  A8509 Download

File Size   1132.77 Kbytes
Page   28 Pages
Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems
Description Wide Input Voltage Range, High Efficiency

A8509 Datasheet (PDF)

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A8509 Datasheet PDF - Allegro MicroSystems

Part # A8509
Download  A8509 Click to download

File Size   1132.77 Kbytes
Page   28 Pages
Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems
Description Wide Input Voltage Range, High Efficiency

A8509 Datasheet (HTML) - Allegro MicroSystems

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A8509 Product details

Description
The A8509 is a multi-output white LED driver for backlighting LCD panels. It integrates a current-mode boost controller and four individual current sinks.
The boost controller architecture allows for significant scaling of boost voltage to optimize the solution for the required number of LEDs per string. The FSET/SYNC pin either sets the required boost switching frequency or synchronizes the value in the range of 300 to 800 kHz.
The LED sink current value is set by an external ISET resistor (see figure 1). The four LED sinks can also be combined to achieve even higher current per LED string.

Features and Benefits
• Four integrated high current sinks for LED strings; can be
   tied together for even higher currents
• Fixed frequency current mode control with integrated gate
   driver / boost controller; powerful gate driver to drive an
   external N-channel MOSFET allows significant scaling
   capability on the number of LEDs per string
• Parallel operation with one boost controller (master) and
   up to three additional slave controllers; can run up to
   16 strings of LEDs while populating only a single master
   boost regulator
• Active current sharing between LED strings for
   0.7% accuracy and 0.8% matching
• Wide input voltage range: 9 to 40 V
• Internal bias supply for single-supply operation (typically
   VIN = 12 or 24 V)
• Separate Enable and PWM pins as interface for Enable
   and PWM Dimming functions
• Fset/ Sync function to either set the boost converter
   switching frequency or synchronize at up to 800 kHz
• Protection Features
   ▫ Open or shorted LED pin protection
   ▫ Open Schottky protection
   ▫ Pulse-by-pulse current limit
   ▫ Overtemperature protection (OTP)




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About Allegro MicroSystems


Allegro MicroSystems is a semiconductor company that designs, manufactures, and markets high-performance power and sensing solutions. The company was founded in 1990 and is headquartered in Manchester, New Hampshire, USA.

Allegro MicroSystems' product portfolio includes Hall-effect sensors, power ICs, motor drivers, and magnetic digital position sensors. These products are used in a wide range of applications, including automotive, industrial, and consumer electronics.

Allegro MicroSystems is known for its expertise in magnetic sensing technology, which is used in many of its products. The company's products are designed to meet the highest standards of performance and reliability, and are manufactured using the latest technology and materials. Allegro MicroSystems also offers custom design and engineering services to meet the specific needs of its customers.

Allegro MicroSystems has a global presence, with sales offices and representatives located around the world. The company is dedicated to delivering innovative and reliable power and sensing solutions that meet the evolving needs of the electronics industry. In 2021, Allegro MicroSystems went public through an initial public offering (IPO) on the NASDAQ stock exchange.

*This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information.




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