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A6268

Allegro MicroSystems
Part Number A6268
Manufacturer Allegro MicroSystems
Description Automotive High Current LED Controller
Published Feb 17, 2015
Detailed Description A6268 Automotive High Current LED Controller FEATURES AND BENEFITS ▪ AEC-Q100 Grade 0 Automotive Qualified ▪ Constant c...
Datasheet PDF File A6268 PDF File

A6268
A6268


Overview
A6268 Automotive High Current LED Controller FEATURES AND BENEFITS ▪ AEC-Q100 Grade 0 Automotive Qualified ▪ Constant current LED drive ▪ 5 to 50 V supply ▪ Boost or buck-boost modes ▪ 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 ▪ 10 μA shutdown current including LED leakage 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) Not to scale DESCRIPTION The A6268 is a DC-to-DC 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 A6268 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.
This DC-DC converter can be configured as a ground-referenced boost converter or as a supply-referenced boost converter providing buck-boost capability.
The buck-boost topology used ensures that there is no leakage path through the LEDs when in shutdown and no inrush current at power-up.
Integrated diagnostics and two fault outputs give indication of VIN and VREG 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, LED overcurrent and shorted LED string protection.
A unique feature is the ability to de...


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