The A6268 is a DC-to-DC converter controller that provides a programmable constant current output to drive high-power LEDs connected in series. The 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 an extremely cost-effective solution using an external logic-level MOSFET with minimal additional external components. The maximum LED current can be set with a single external induction resistor and can be modified using a current reference input. Direct PWM control can be achieved by enabling input, and it also has a shutdown mode.
The DC-to-DC converter can be configured as a ground-referenced boost converter, or a power-powered reference boost converter to provide buck-boost capability. Using a buck-boost topology ensures that the LEDs have no leakage path when shutting down and no inrush current when starting up.
Integrated diagnostics and dual fault outputs indicate VIN and VREG undervoltage, chip overheating, output open, LED short, and LED undercurrent, and can be configured to provide power short-circuit and ground short-circuit protection for LED connections, as well as LED overcurrent and LED string short-circuit protection. With the unique feature of detecting one or more shorted LEDs.
The device is available in a 16-pin TSSOP package (suffix LP) with an exposed heat sink mounted. It is packaged as a lead-free (Pb) product with a 100% matte tin plated pin frame.
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汽车高功率 LED 照明系统
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雾灯、倒车灯、白天行驶灯
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汽车前灯
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AEC Q100 0 级汽车适用
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恒流 LED 驱动器
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5 至 50 V 电源电压
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升压或升降压模式
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驱动多达 15 个串联 LED
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可编程的开关频率为 100 至 700kHz
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LED 过压开路指示和保护
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单个和多个 LED 短路指示
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LED 接地短路和供电保护
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PWM 调光控制
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10 µA 关机电流（包括 LED 漏电）