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A6266

Allegro MicroSystems
Part Number A6266
Manufacturer Allegro MicroSystems
Published Dec 5, 2011
Description High Current LED Controller
Detailed Description A6266 Automotive, Boost, High Current LED Controller Features and Benefits ▪ AEC-Q100 Grade 0 Automotive Qualified ▪ Co...
Datasheet PDF File A6266 PDF File

A6266
A6266


Overview
A6266 Automotive, Boost, High Current LED Controller Features and Benefits ▪ AEC-Q100 Grade 0 Automotive Qualified ▪ Constant current LED drive ▪ 5 to 50 V supply ▪ Boost mode ▪ Drives up to 15 LEDs in series ▪ Programmable switching frequency 100 to 700 kHz ▪ Open LED overvoltage indication and protection ▪ Single and multiple LED short indication ▪ LED short to ground and supply protection ▪ PWM dimming control Applications: ▪ Automotive high power LED lighting systems ▪ Fog lights, reversing lights, daytime running lights ▪ Headlights Package: 16-pin TSSOP with exposed thermal pad (suffix LP) Description The A6266 is a boost converter controller, providing a programmable constant current output for driving high power LEDs in series.
Driving the LEDs in series ensures identical currents and uniform brightness.
For automotive applications, optimum performance is achieved when driving up to 15 LEDs at currents up to 1 A.
The A6266 provides a cost-effective solution using an external logic-level MOSFET and minimum additional external components.
The maximum LED current is set with a single external sense resistor and can be modified using a current reference input.
Direct PWM control is possible via the Enable input, which also provides a shutdown mode.
Integrated diagnostics and two fault outputs give indication of undervoltage, chip overtemperature, output open circuit, LED short circuit and LED undercurrent, and can be configured to provide short to supply and short to ground protection for the LED connections.
A unique feature is the ability to detect one or more shorted LEDs.
The device is provided in a 16-pin TSSOP package with exposed thermal pad (suffix LP).
It is lead (Pb) free, with 100% matte tin leadframe plating.
Not to scale Typical Application Diagram VBAT 12 V or 24 V(50 V max) Power net Boost Mode VBAT(min) (V) Maximum Quantity of LEDs 6 10 7 12 8 13 9 15 Vf of each LED = 3.
5 V, D = 85% Fault Flags Enable VIN VREG LN LP FF1 FF2...


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