A6268is a DC to DC convertercontrollerA programmable constant-current output is available to drive high-power LEDs connected in series. LEDs that drive in series ensure the same current and uniform brightness. For automotive applications, it can drive up to 15 LEDs at up to 1 A for optimized performance.
The A6268 provides a cost-effective solution using external logic horizontal MOSFETs and a minimal number of additional external components. The maximum LED current is programmable with a single external sense resistor and can be modified using a current reference input. Direct PWM control can be achieved by enabling the input, and there is also a slave mode.
DC-DC converters can be configured as ground-referenced boost converters or supply-referenced boost converters to provide buck-boost capability. Using a buck-boost topology ensures that the LEDs have no leakage path during shutdown and no inrush current at startup.
Integrated diagnostic and dual fault outputs indicate VIN and VREG undervoltage, die overtemperature, output open, LED short, and LED undercurrent, and can be configured to provide short-to-supply and short-to-ground protection for LED connections, as well as LED overcurrent and LED string short-circuit protection. Has a unique feature to detect one or more short-circuited LEDs.
The unit is available in a 16-pin TSSOP package (suffix LP) with an exposed heat sink. It is packaged as a lead (PB) free product and features 100% matte tin leadframe plating.
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- Automotive high-power LED lighting systems
- Fog lights, reversing lights, daytime running lights
- Car headlights
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- AEC Q100 Class 0 for cars
- Constant current LED driver
- 5 to 50 V supply voltage
- Boost or buck-boost mode
- Drive up to 15 LEDs in series
- Programmable switching frequency is 100 to 700kHz
- LED overvoltage open-circuit indication and protection
- Single and multiple LED short-circuit indications
- LED short-to-ground and power supply protection
- PWM dimming control
- 10 μA shutdown current (including LED leakage)