LED driver for high-current applications

14 October 2009 Opto-Electronics

The new LT3519 from Linear Technology is a 45 V, high-side current sense DC-DC converter designed to drive high-current LEDs. Its 3 to 40 V input voltage range makes it suitable for applications such as automotive and industrial lighting. The combination of an internal 45 V, 750 mA switch, Schottky diode and internal compensation provides a highly compact LED driver solution.

The LT3519 can drive up to ten 100 mA white LEDs from a 12 V input, and can deliver efficiencies up to 90% in boost mode from a compact MSOP-16E package. The IC utilises True Colour PWM dimming to deliver constant LED colour with ranges of more than 3000:1. For less demanding dimming requirements, the CTRL pin can be used to offer 10:1 analog dimming. The device’s fixed frequency, constant current, constant voltage regulation provides stable operation over a wide range of supply and output voltages, while ensuring uniform brightness of LEDs. There are three switching frequency options available: the LT3519, which switches at 400 kHz; the LT3519-1, which switches at 1 MHz; and the LT3519-2, offering a 2,2 MHz switching frequency.

The device senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. Combining a traditional voltage feedback and unique floating current sense feedback, these converters can operate as constant-voltage or constant-current source, offering design flexibility. Other features include open LED protection, soft-start and thermal protection.

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